This paper discusses an approach for object detection and classification. Object detection approaches find the object or objects of the real world present either in a digital image or a video, where the object can belong to any class of objects. Humans can detect the objects present in an image or video quite easily but it is not so easy to do the same by machine, for this, it is necessary to make the machine more intelligent. Presented approach is an attempt to detect the object and classify the same detected object to the matching class by using the concept of Steiner tree. A Steiner tree is a tree in a distance graph which spans a given subset of vertices (Steiner Points) with the minimal total distance on its edges. For a given graph G, a Steiner tree is a connected and acyclic sub graph of G. This problem is called as Steiner tree problem where the aim is to find a Steiner minimum tree in the given graph G. Basically the process of object detection can be divided as object recognition and object classification. A Multi Scale Boosted Detector is used in the presented approach, which is the combination of multiple single scale detectors; in order to detect the object present in the image. Presented approach makes use of the concept of Steiner tree in order to classify the objects that are present in an image. To know the class of the detected object, the Steiner tree based classifier is used. In order to reach to the class of the object, four parameters namely, Area, Eccentricity, Euler Number and Orientation of the object present in the image are evaluated and these parameters form a graph keeping each parameter on independent level of graph. This graph is explored to find the minimum Steiner tree by calculating the nearest neighbor distance. Experimentations are carried out using the standard LabelMe dataset. Obtained results are evaluated based on the performance evaluation parameters such as precision and recall.
Survey of The Problem of Object Detection In Real ImagesCSCJournals
Object detection and recognition are important problems in computer vision. Since these problems are meta-heuristic, despite a lot of research, practically usable, intelligent, real-time, and dynamic object detection/recognition methods are still unavailable. The accuracy level of any algorithm or even Google glass project is below 16% for over 22,000 object categories. With this accuracy, it’s practically unusable. This paper reviews the various aspects of object detection and the challenges involved. The aspects addressed are feature types, learning model, object templates, matching schemes, and boosting methods. Most current research works are highlighted and discussed. Decision making tips are included with extensive discussion of the merits and demerits of each scheme.
This document discusses k-means clustering for image segmentation. It begins with an abstract describing a color-based image segmentation method using k-means clustering to partition pixels into homogeneous clusters. It then provides background on image segmentation and k-means clustering. The document outlines the k-means clustering algorithm and applies it to segment an example image ("rotapple.jpg") into three clusters corresponding to different image regions. It concludes that k-means clustering provides an effective approach for basic image segmentation.
This document summarizes a research paper that proposes an algorithm for detecting brain tumors in MRI images based on analyzing bilateral symmetry. The algorithm first performs preprocessing like smoothing and contrast enhancement. It then identifies the bilateral symmetry axis of the brain. Next, it segments the image into symmetric regions, enhancing asymmetric edges that may indicate a tumor. Experiments showed the algorithm can automatically detect tumor positions and boundaries. The algorithm leverages the fact that brain MRI of a healthy person is nearly bilaterally symmetric, while a tumor disrupts this symmetry.
UNSUPERVISED ROBOTIC SORTING: TOWARDS AUTONOMOUS DECISION MAKING ROBOTSijaia
This document presents research on unsupervised robotic sorting (URS). The researchers propose a solution to the URS problem where unknown objects are sorted into groups without predefined classes. Their approach uses convolutional neural networks (CNNs) to extract features from images of each object, then applies clustering algorithms to group similar objects. They test their image clustering pipeline on various datasets and propose a new dataset to evaluate robustness under different conditions. Additionally, they introduce a multi-view clustering approach using ensemble clustering with multiple images of each object to increase sorting robustness. The paper formalizes URS as a new problem and presents the first application of image-set clustering to robotics decision making.
This document presents a novel algorithm for grouping 3D object models based on their appearance in a hierarchical structure, similar to human perception. The algorithm uses clustering to divide objects into subclasses and then further divides each subclass into predefined groups to build the hierarchy. Principal component analysis is used to compactly represent appearance models from multiple images of each object. Distances between manifolds, subspaces, and individual models are calculated to measure similarity and perform the grouping. The goal is to develop a more natural object classifier that mimics how humans differentiate and classify objects based on visual characteristics like shape, color, and texture.
The efficiency and quality of a feature descriptor are critical to the user experience of many computer vision applications. However, the existing descriptors are either too computationally expensive to achieve real-time performance, or not sufficiently distinctive to identify correct matches from a large database with various transformations. In this paper, we propose a highly efficient and distinctive binary descriptor, called local difference binary (LDB). LDB directly computes a binary string for an image patch using simple intensity and gradient difference tests on pair wise grid cells within the patch. A multiple-gridding strategy and a salient bit-selection method are applied to capture the distinct patterns of the patch at different spatial granularities. Experimental results demonstrate that compared to the existing state-of-the-art binary descriptors, primarily designed for speed, LDB has similar construction efficiency, while achieving a greater accuracy and faster speed for mobile object recognition and tracking tasks.
Kandemir Inferring Object Relevance From Gaze In Dynamic ScenesKalle
As prototypes of data glasses having both data augmentation and gaze tracking capabilities are becoming available, it is now possible to develop proactive gaze-controlled user interfaces to display information about objects, people, and other entities in real-world setups. In order to decide which objects the augmented information should be about, and how saliently to augment, the system needs an estimate of the importance or relevance of the objects of the scene for the user at a given time. The estimates will be used to minimize distraction of the user, and for providing efficient spatial management of the augmented items. This work is a feasibility study on inferring the relevance of objects in dynamic scenes from gaze. We collected gaze data from subjects watching a video for a pre-defined task. The results show that a simple ordinal logistic regression model gives relevance rankings of scene objects with a promising accuracy.
A Robust Method for Moving Object Detection Using Modified Statistical Mean M...ijait
Moving object detection is low-level, important task for any visual surveillance system. One of the aim of this paper is to, to describe various approaches of moving object detection such as background subtraction, temporal difference, as well as pros and cons of these techniques. A statistical mean technique [10] has been used to overcome the problem in previous techniques. Even statistical mean method also suffers with the problem of superfluous effects of foreground objects. In this paper, the presented method tries to overcome this effect as well as reduces the computational complexity up to some extent. In this paper, a robust algorithm for automatic, noise detection and removal from moving objects in video sequences is presented. The algorithm considers static camera parameters.
Survey of The Problem of Object Detection In Real ImagesCSCJournals
Object detection and recognition are important problems in computer vision. Since these problems are meta-heuristic, despite a lot of research, practically usable, intelligent, real-time, and dynamic object detection/recognition methods are still unavailable. The accuracy level of any algorithm or even Google glass project is below 16% for over 22,000 object categories. With this accuracy, it’s practically unusable. This paper reviews the various aspects of object detection and the challenges involved. The aspects addressed are feature types, learning model, object templates, matching schemes, and boosting methods. Most current research works are highlighted and discussed. Decision making tips are included with extensive discussion of the merits and demerits of each scheme.
This document discusses k-means clustering for image segmentation. It begins with an abstract describing a color-based image segmentation method using k-means clustering to partition pixels into homogeneous clusters. It then provides background on image segmentation and k-means clustering. The document outlines the k-means clustering algorithm and applies it to segment an example image ("rotapple.jpg") into three clusters corresponding to different image regions. It concludes that k-means clustering provides an effective approach for basic image segmentation.
This document summarizes a research paper that proposes an algorithm for detecting brain tumors in MRI images based on analyzing bilateral symmetry. The algorithm first performs preprocessing like smoothing and contrast enhancement. It then identifies the bilateral symmetry axis of the brain. Next, it segments the image into symmetric regions, enhancing asymmetric edges that may indicate a tumor. Experiments showed the algorithm can automatically detect tumor positions and boundaries. The algorithm leverages the fact that brain MRI of a healthy person is nearly bilaterally symmetric, while a tumor disrupts this symmetry.
UNSUPERVISED ROBOTIC SORTING: TOWARDS AUTONOMOUS DECISION MAKING ROBOTSijaia
This document presents research on unsupervised robotic sorting (URS). The researchers propose a solution to the URS problem where unknown objects are sorted into groups without predefined classes. Their approach uses convolutional neural networks (CNNs) to extract features from images of each object, then applies clustering algorithms to group similar objects. They test their image clustering pipeline on various datasets and propose a new dataset to evaluate robustness under different conditions. Additionally, they introduce a multi-view clustering approach using ensemble clustering with multiple images of each object to increase sorting robustness. The paper formalizes URS as a new problem and presents the first application of image-set clustering to robotics decision making.
This document presents a novel algorithm for grouping 3D object models based on their appearance in a hierarchical structure, similar to human perception. The algorithm uses clustering to divide objects into subclasses and then further divides each subclass into predefined groups to build the hierarchy. Principal component analysis is used to compactly represent appearance models from multiple images of each object. Distances between manifolds, subspaces, and individual models are calculated to measure similarity and perform the grouping. The goal is to develop a more natural object classifier that mimics how humans differentiate and classify objects based on visual characteristics like shape, color, and texture.
The efficiency and quality of a feature descriptor are critical to the user experience of many computer vision applications. However, the existing descriptors are either too computationally expensive to achieve real-time performance, or not sufficiently distinctive to identify correct matches from a large database with various transformations. In this paper, we propose a highly efficient and distinctive binary descriptor, called local difference binary (LDB). LDB directly computes a binary string for an image patch using simple intensity and gradient difference tests on pair wise grid cells within the patch. A multiple-gridding strategy and a salient bit-selection method are applied to capture the distinct patterns of the patch at different spatial granularities. Experimental results demonstrate that compared to the existing state-of-the-art binary descriptors, primarily designed for speed, LDB has similar construction efficiency, while achieving a greater accuracy and faster speed for mobile object recognition and tracking tasks.
Kandemir Inferring Object Relevance From Gaze In Dynamic ScenesKalle
As prototypes of data glasses having both data augmentation and gaze tracking capabilities are becoming available, it is now possible to develop proactive gaze-controlled user interfaces to display information about objects, people, and other entities in real-world setups. In order to decide which objects the augmented information should be about, and how saliently to augment, the system needs an estimate of the importance or relevance of the objects of the scene for the user at a given time. The estimates will be used to minimize distraction of the user, and for providing efficient spatial management of the augmented items. This work is a feasibility study on inferring the relevance of objects in dynamic scenes from gaze. We collected gaze data from subjects watching a video for a pre-defined task. The results show that a simple ordinal logistic regression model gives relevance rankings of scene objects with a promising accuracy.
A Robust Method for Moving Object Detection Using Modified Statistical Mean M...ijait
Moving object detection is low-level, important task for any visual surveillance system. One of the aim of this paper is to, to describe various approaches of moving object detection such as background subtraction, temporal difference, as well as pros and cons of these techniques. A statistical mean technique [10] has been used to overcome the problem in previous techniques. Even statistical mean method also suffers with the problem of superfluous effects of foreground objects. In this paper, the presented method tries to overcome this effect as well as reduces the computational complexity up to some extent. In this paper, a robust algorithm for automatic, noise detection and removal from moving objects in video sequences is presented. The algorithm considers static camera parameters.
IRJET - Clustering Algorithm for Brain Image SegmentationIRJET Journal
The document presents a clustering algorithm for brain image segmentation using fuzzy c-means clustering. It aims to optimize the segmentation process and achieve higher accuracy rates when segmenting human MRI brain images. The fuzzy c-means algorithm is combined with rough set theory for segmentation. The algorithm segments images into homogeneous regions where adjacent regions are heterogeneous. This approach is evaluated on a set of brain images and demonstrates effectiveness as well as a comparison to other related algorithms. The goal of the algorithm is to simplify images and extract useful information for detecting brain tumors.
Performance Comparison of Face Recognition Using DCT Against Face Recognition...CSCJournals
In this paper, a face recognition system using simple Vector quantization (VQ) technique is proposed. Four different VQ algorithms namely LBG, KPE, KMCG and KFCG are used to generate codebooks of desired size. Euclidean distance is used as similarity measure to compare the feature vector of test image with that of trainee images. Proposed algorithms are tested on two different databases. One is Georgia Tech Face Database which contains color JPEG images, all are of different size. Another database used for experimental purpose is Indian Face Database. It contains color bitmap images. Using above VQ techniques, codebooks of different size are generated and recognition rate is calculated for each codebook size. This recognition rate is compared with the one obtained by applying DCT on image and LBG-VQ algorithm which is used as benchmark in vector quantization. Results show that KFCG outperforms other three VQ techniques and gives better recognition rate up to 85.4% for Georgia Tech Face Database and 90.66% for Indian Face Database. As no Euclidean distance computations are involved in KMCG and KFCG, they require less time to generate the codebook as compared to LBG and KPE
FUZZY SET THEORETIC APPROACH TO IMAGE THRESHOLDINGIJCSEA Journal
Thresholding is a fast, popular and computationally inexpensive segmentation technique that is always critical and decisive in some image processing applications. The result of image thresholding is not always satisfactory because of the presence of noise and vagueness and ambiguity among the classes. Since the theory of fuzzy sets is a generalization of the classical set theory, it has greater flexibility to capture faithfully the various aspects of incompleteness or imperfectness in information of situation. To overcome this problem, in this paper we proposed a two-stage fuzzy set theoretic approach to image thresholding utilizing the measure of fuzziness to evaluate the fuzziness of an image and to determine an adequate threshold value. At first, images are preprocessed to reduce noise without any loss of image details by fuzzy rule-based filtering and then in the final stage a suitable threshold is determined with the help of a fuzziness measure as a criterion function. Experimental results on test images have demonstrated the effectiveness of this method.
IRJET - Deep Learning Approach to Inpainting and Outpainting SystemIRJET Journal
This document discusses a deep learning approach for image inpainting and outpainting. It proposes a new generative model-based approach using a fully convolutional neural network that can process images with multiple holes at variable locations and sizes. The model aims to not only synthesize novel image structures, but also explicitly utilize surrounding image features as references during training to generate better predictions. Experiments on faces, textures and natural images demonstrate the proposed approach generates higher quality inpainting results than existing methods. It aims to address limitations of CNNs in borrowing information from distant areas by leveraging texture and patch synthesis approaches.
This document describes an expandable Bayesian network (EBN) approach for 3D object description from multiple images and sensor data. The key points are:
- EBNs can dynamically instantiate network structures at runtime based on the number of input images, allowing the use of a varying number of evidence features.
- EBNs introduce the use of hidden variables to handle correlation of evidence features across images, whereas previous approaches did not properly model this.
- The document presents an application of an EBN for building detection and description from aerial images using multiple views and sensor data. Experimental results showed the EBN approach provided significant performance improvements over other methods.
A Novel Edge Detection Technique for Image Classification and AnalysisIOSR Journals
Abstract: The main aim of this project is to propose a new method for image segmentation. Image
Segmentation is concerned with splitting an image up into segments (also called regions or areas) that each
holds some property distinct from their neighbor. Simply, another word for the Object Detection is
“Segmentation “. Segmentation is divided into two types they are Supervised Segmentation and Unsupervised
Segmentation. Segmentation consists of three types of methods which are divided on the basis of threshold, edge
and region. Thresholding is a commonly used enhancement whose goal is to segment an image into object and
background. Edge-based segmentations rely on edges found in an image by edge detecting operators. Region
based segmentations basic idea is to divide an image into zones of maximum homogeneity, where homogeneity
is an important property of regions. Edge detection has been a field of fundamental importance in digital image
processing research. Edge can be defined as a pixels located at points where abrupt changes in gray level take
place in this paper one novel approach for edge detection in gray scale images, which is based on diagonal
pixels in 2*2 region of the image, is proposed. This method first uses a threshold value to segment the image
and binary image. And then the proposed edge detector. In order to validate the results, seven different
kinds of test images are considered to examine the versatility of the proposed edge detector. It has been
observed that the proposed edge detector works effectively for different gray scale digital images. The results of
this study are quite promising. In this project we proposed a new algorithm for edge Detection. The main
advantage of this algorithm is with running mask on the original image we can detect the edges in the images by
using the proposed scheme for edge detection.
Keywords: Edge detection, segmentation, thresholding.
Image Segmentation from RGBD Images by 3D Point Cloud Attributes and High-Lev...CSCJournals
The document describes an image segmentation algorithm that uses both color and depth features extracted from RGBD images captured by a Kinect sensor. The algorithm clusters pixels into segments based on their color, texture, 3D spatial coordinates, surface normals, and the output of a graph-based segmentation algorithm. Depth features help resolve illumination issues and occlusion that cannot be handled by color-only methods. The algorithm was tested on commercial building images and showed potential for real-time applications.
An Evolutionary Dynamic Clustering based Colour Image SegmentationCSCJournals
We have presented a novel Dynamic Colour Image Segmentation (DCIS) System for colour image. In this paper, we have proposed an efficient colour image segmentation algorithm based on evolutionary approach i.e. dynamic GA based clustering (GADCIS). The proposed technique automatically determines the optimum number of clusters for colour images. The optimal number of clusters is obtained by using cluster validity criterion with the help of Gaussian distribution. The advantage of this method is that no a priori knowledge is required to segment the color image. The proposed algorithm is evaluated on well known natural images and its performance is compared to other clustering techniques. Experimental results show the performance of the proposed algorithm producing comparable segmentation results.
Credal Fusion of Classifications for Noisy and Uncertain DataIJECEIAES
This paper reports on an investigation in classification technique employed to classify noised and uncertain data. However, classification is not an easy task. It is a significant challenge to discover knowledge from uncertain data. In fact, we can find many problems. More time we don’t have a good or a big learning database for supervised classification. Also, when training data contains noise or missing values, classification accuracy will be affected dramatically. So to extract groups from data is not easy to do. They are overlapped and not very separated from each other. Another problem which can be cited here is the uncertainty due to measuring devices. Consequentially classification model is not so robust and strong to classify new objects. In this work, we present a novel classification algorithm to cover these problems. We materialize our main idea by using belief function theory to do combination between classification and clustering. This theory treats very well imprecision and uncertainty linked to classification. Experimental results show that our approach has ability to significantly improve the quality of classification of generic database.
Medical Image Analysis Through A Texture Based Computer Aided Diagnosis Frame...CSCJournals
The document presents a Texture Based Computer Aided Diagnosis (T-CAD) Framework for analyzing medical images through texture analysis. The framework allows defining mathematical models of objects in medical images and automatically generates applications to support tasks like segmentation, mass detection, and reconstruction based on each model. The framework architecture is described, including a Region Based Algorithm for building mathematical models from training images and classifying new images. Several textural image filters used in the framework are also outlined, including filters for measuring informative, texture, and pattern information. The framework is tested on MRI brain images and results are reported.
Computer Vision: Visual Extent of an ObjectIOSR Journals
The document discusses analyzing the visual extent of objects in images using computer vision techniques. It performs two analyses: 1) Without knowing object locations, it determines which image parts contribute most to object classification. 2) Assuming known object locations, it evaluates the potential of object vs. surround and object interior vs. border. The analyses find that object classification performance improves significantly when the object location is known. Descriptors from the object interior contribute more than those from the border. Knowing object locations allows separating relevant from irrelevant image regions.
Survey on Segmentation of Partially Overlapping ObjectsIRJET Journal
This document summarizes several existing methods for segmenting partially overlapping objects in digital images. It discusses challenges in segmenting overlapping objects and different approaches researchers have used, including watershed-based methods, graph cuts algorithms, active shape models, and level set methods. The goal of segmentation is to partition an image into meaningful regions to analyze objects and boundaries. Efficient segmentation of overlapping objects remains an important challenge in image processing.
This document presents research on classifying data using a new enhanced decision tree algorithm called NEDTA. It first provides background on data mining and decision tree classification techniques. It then discusses existing decision tree algorithms ID3, J48 and NBTree and applies them to a banking dataset to evaluate performance. The objectives are stated as applying the algorithms, evaluating results, comparing performance based on accuracy, time and error rate, and developing an enhanced method. The document outlines the implementation and provides results of applying the existing algorithms in Weka. It compares the accuracy and performance of ID3, J48 and NBTree and finds the new NEDTA algorithm produces better results.
Towards Semantic Clustering – A Brief OverviewCSCJournals
Image clustering is an important technology which helps users to get hold of the large amount of online visual information, especially after the rapid growth of the Web. This paper focuses on image clustering methods and their application in image collection or online image repository. Current progress of image clustering related to image retrieval and image annotation are summarized and some open problems are discussed. Related works are summarized based on the problems addressed, which are image segmentation, compact representation of image set, search space reduction, and semantic gap. Issues are also identified in current progress and semantic clustering is conjectured to be the potential trend. Our framework of semantic clustering as well as the main abstraction levels involved is briefly discussed.
This document presents a new algorithm called UDT-CDF for building decision trees to classify uncertain numerical data. It improves on previous algorithms like UDT that were based on probability density functions (PDFs). The key aspects of the new algorithm are:
1. It uses cumulative distribution functions (CDFs) rather than PDFs to represent uncertain numerical attributes, since CDFs provide more complete probability information.
2. It splits data at decision tree nodes based on the CDF, placing data with values covering the split point into both branches weighted by the CDF.
3. Experimental results show the new CDF-based algorithm achieves more accurate classifications and is more computationally efficient than the PDF-based UDT algorithm,
Texture Segmentation Based on Multifractal Dimensionijsc
Texture segmentation can be considered the most important problem, since human can distinguish different
textures quit easily, but the automatic segmentation is quit complex and it is still an open problem for
research. In this paper focus on implement novel supervised algorithm for multitexture segmentation and
this algorithm based on blocking procedure where each image divide into block (16×16 pixels) and extract
vector feature for each block to classification these block based on these feature. These feature extract
using Box Counting Method (BCM). BCM generate single feature for each block and this feature not
enough to characterize each block ,therefore, must be implement algorithm provide more than one slide for
the image based on new method produce multithresolding, after this use BCM to generate single feature for
each slide.
A Blind Steganalysis on JPEG Gray Level Image Based on Statistical Features a...IJERD Editor
This paper presents a blind steganalysis technique to effectively attack the JPEG steganographic
schemes i.e. Jsteg, F5, Outguess and DWT Based. The proposed method exploits the correlations between
block-DCTcoefficients from intra-block and inter-block relation and the statistical moments of characteristic
functions of the test image is selected as features. The features are extracted from the BDCT JPEG 2-array.
Support Vector Machine with cross-validation is implemented for the classification.The proposed scheme gives
improved outcome in attacking.
A Survey of Image Segmentation based on Artificial Intelligence and Evolution...IOSR Journals
Abstract : In image analysis, segmentation is the partitioning of a digital image into multiple regions (sets of
pixels), according to some homogeneity criterion. The problem of segmentation is a well-studied one in
literature and there are a wide variety of approaches that are used. Different approaches are suited to different
types of images and the quality of output of a particular algorithm is difficult to measure quantitatively due to
the fact that there may be much correct segmentation for a single image. Image segmentation denotes a process
by which a raw input image is partitioned into nonoverlapping regions such that each region is homogeneous
and the union of any two adjacent regions is heterogeneous. A segmented image is considered to be the highest
domain-independent abstraction of an input image. Image segmentation is an important processing step in many
image, video and computer vision applications. Extensive research has been done in creating many different
approaches and algorithms for image segmentation, but it is still difficult to assess whether one algorithm
produces more accurate segmentations than another, whether it be for a particular image or set of images, or
more generally, for a whole class of images.
In this paper, The Survey of Image Segmentation using Artificial Intelligence and Evolutionary Approach
methods that have been proposed in the literature. The rest of the paper is organized as follows. 1.
Introduction, 2.Literature review, 3.Noteworthy contributions in the field of proposed work, 4.Proposed
Methodology, 5.Expected outcome of the proposed research work, 6.Conclusion.
Keywords: Image Segmentation, Segmentation Algorithm, Artificial Intelligence, Evolutionary Algorithm,
Neural Network, Fuzzy Set, Clustering.
Object recognition in computer vision involves finding objects in images or video. It is challenging due to variations in objects' appearance from different viewpoints, scales, rotations, or partial obstructions. An object recognition system must have four main components: a model database containing object models, a feature detector to identify distinguishing characteristics, a hypothesizer to generate potential object matches, and a hypothesis verifier to confirm the best match using the models. Key considerations for the system include how objects and their features are represented, which features to extract, how to select potential matches, and how to verify the most likely object.
MAGNETIC RESONANCE BRAIN IMAGE SEGMENTATIONVLSICS Design
Segmentation of tissues and structures from medical images is the first step in many image analysis applications developed for medical diagnosis. With the growing research on medical image segmentation, it is essential to categorize the research outcomes and provide researchers with an overview of the existing segmentation techniques in medical images. In this paper, different image segmentation methods applied on magnetic resonance brain images are reviewed. The selection of methods includes sources from image processing journals, conferences, books, dissertations and thesis. The conceptual details of the methods are explained and mathematical details are avoided for simplicity. Both broad and detailed categorizations of reviewed segmentation techniques are provided. The state of art research is provided with emphasis on developed techniques and image properties used by them. The methods defined are not always mutually independent. Hence, their inter relationships are also stated. Finally, conclusions are drawn summarizing commonly used techniques and their complexities in application.
The document discusses techniques for object recognition in images. It begins by outlining some of the challenges in object recognition, such as varying lighting, position, scale, and occlusion. It then describes several common object recognition techniques:
1. Template matching involves comparing images to stored templates but can be affected by changes in lighting, position, etc.
2. Color-based techniques use color histograms to match objects but require photometric invariance.
3. Local features represent objects with descriptors of local image patches but have limitations, while global features provide better recognition but are more complex to extract.
4. Shape-based methods match edge maps and contours between images and templates but require good segmentation.
The document
REVIEW ON GENERIC OBJECT RECOGNITION TECHNIQUES: CHALLENGES AND OPPORTUNITIES IAEME Publication
Recognizing objects automatically from an image is a fundamental step for many real-world computer vision applications. It is the task of identifying an instance of object in an image or video sequence without or least human intervention and assistance. In-spite of very high complexity, human beings perform this task with very less effort and even in the state of least attention. Little effort is needed for the humans to recognize huge number of and various categories of objects in images, though ‘object’ in the image may be different with respect to size / scale, viewpoint, position or orientation. We are even able to recognize the objects from an image, when they are only partially visible or present against cluttered background. Not only this, the recognition can be for specific instance of object or object category/class. When the task is done for classes of the object it is known as Generic object recognition or object-class detection or category-level object recognition. It has been found that over the years many techniques have evolved for recognizing object classes from images, but any automated object recognition system till date has not gained this capability fully at par with human beings. This very fact makes recognition of objects from an image, the most basic and fundamental challenge in the field of computer vision research. The purpose of this study is to give an overview and categorization of the approaches used in the literature for the purpose of Generic Object Recognition and various technical advancements achieved in the field. Mostly the survey focusses on the leading work since year 2000.
IRJET - Clustering Algorithm for Brain Image SegmentationIRJET Journal
The document presents a clustering algorithm for brain image segmentation using fuzzy c-means clustering. It aims to optimize the segmentation process and achieve higher accuracy rates when segmenting human MRI brain images. The fuzzy c-means algorithm is combined with rough set theory for segmentation. The algorithm segments images into homogeneous regions where adjacent regions are heterogeneous. This approach is evaluated on a set of brain images and demonstrates effectiveness as well as a comparison to other related algorithms. The goal of the algorithm is to simplify images and extract useful information for detecting brain tumors.
Performance Comparison of Face Recognition Using DCT Against Face Recognition...CSCJournals
In this paper, a face recognition system using simple Vector quantization (VQ) technique is proposed. Four different VQ algorithms namely LBG, KPE, KMCG and KFCG are used to generate codebooks of desired size. Euclidean distance is used as similarity measure to compare the feature vector of test image with that of trainee images. Proposed algorithms are tested on two different databases. One is Georgia Tech Face Database which contains color JPEG images, all are of different size. Another database used for experimental purpose is Indian Face Database. It contains color bitmap images. Using above VQ techniques, codebooks of different size are generated and recognition rate is calculated for each codebook size. This recognition rate is compared with the one obtained by applying DCT on image and LBG-VQ algorithm which is used as benchmark in vector quantization. Results show that KFCG outperforms other three VQ techniques and gives better recognition rate up to 85.4% for Georgia Tech Face Database and 90.66% for Indian Face Database. As no Euclidean distance computations are involved in KMCG and KFCG, they require less time to generate the codebook as compared to LBG and KPE
FUZZY SET THEORETIC APPROACH TO IMAGE THRESHOLDINGIJCSEA Journal
Thresholding is a fast, popular and computationally inexpensive segmentation technique that is always critical and decisive in some image processing applications. The result of image thresholding is not always satisfactory because of the presence of noise and vagueness and ambiguity among the classes. Since the theory of fuzzy sets is a generalization of the classical set theory, it has greater flexibility to capture faithfully the various aspects of incompleteness or imperfectness in information of situation. To overcome this problem, in this paper we proposed a two-stage fuzzy set theoretic approach to image thresholding utilizing the measure of fuzziness to evaluate the fuzziness of an image and to determine an adequate threshold value. At first, images are preprocessed to reduce noise without any loss of image details by fuzzy rule-based filtering and then in the final stage a suitable threshold is determined with the help of a fuzziness measure as a criterion function. Experimental results on test images have demonstrated the effectiveness of this method.
IRJET - Deep Learning Approach to Inpainting and Outpainting SystemIRJET Journal
This document discusses a deep learning approach for image inpainting and outpainting. It proposes a new generative model-based approach using a fully convolutional neural network that can process images with multiple holes at variable locations and sizes. The model aims to not only synthesize novel image structures, but also explicitly utilize surrounding image features as references during training to generate better predictions. Experiments on faces, textures and natural images demonstrate the proposed approach generates higher quality inpainting results than existing methods. It aims to address limitations of CNNs in borrowing information from distant areas by leveraging texture and patch synthesis approaches.
This document describes an expandable Bayesian network (EBN) approach for 3D object description from multiple images and sensor data. The key points are:
- EBNs can dynamically instantiate network structures at runtime based on the number of input images, allowing the use of a varying number of evidence features.
- EBNs introduce the use of hidden variables to handle correlation of evidence features across images, whereas previous approaches did not properly model this.
- The document presents an application of an EBN for building detection and description from aerial images using multiple views and sensor data. Experimental results showed the EBN approach provided significant performance improvements over other methods.
A Novel Edge Detection Technique for Image Classification and AnalysisIOSR Journals
Abstract: The main aim of this project is to propose a new method for image segmentation. Image
Segmentation is concerned with splitting an image up into segments (also called regions or areas) that each
holds some property distinct from their neighbor. Simply, another word for the Object Detection is
“Segmentation “. Segmentation is divided into two types they are Supervised Segmentation and Unsupervised
Segmentation. Segmentation consists of three types of methods which are divided on the basis of threshold, edge
and region. Thresholding is a commonly used enhancement whose goal is to segment an image into object and
background. Edge-based segmentations rely on edges found in an image by edge detecting operators. Region
based segmentations basic idea is to divide an image into zones of maximum homogeneity, where homogeneity
is an important property of regions. Edge detection has been a field of fundamental importance in digital image
processing research. Edge can be defined as a pixels located at points where abrupt changes in gray level take
place in this paper one novel approach for edge detection in gray scale images, which is based on diagonal
pixels in 2*2 region of the image, is proposed. This method first uses a threshold value to segment the image
and binary image. And then the proposed edge detector. In order to validate the results, seven different
kinds of test images are considered to examine the versatility of the proposed edge detector. It has been
observed that the proposed edge detector works effectively for different gray scale digital images. The results of
this study are quite promising. In this project we proposed a new algorithm for edge Detection. The main
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Survey on Segmentation of Partially Overlapping ObjectsIRJET Journal
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3. Local features represent objects with descriptors of local image patches but have limitations, while global features provide better recognition but are more complex to extract.
4. Shape-based methods match edge maps and contours between images and templates but require good segmentation.
The document
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Video surveillance is active research topic in
computer vision research area for humans & vehicles, so it is
used over a great extent. Multiple images generated using a fixed
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variations, illumination changes after that the object’s identity
and orientation are provided to the user. This scheme is used to
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The document summarizes a research paper titled "Object Discovery in 3D scenes via Shape Analysis" presented at the International Conference on Robotics and Automation (ICRA) in 2013. The paper presents an algorithm that takes 3D meshes of indoor environments as input and ranks segments as potential object candidates based on intrinsic shape measures like compactness, symmetry, and smoothness. It evaluates the approach on a dataset of 58 indoor scenes collected with Kinect Fusion, achieving an average precision of 0.92 in detecting objects.
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This document summarizes research on comparative analysis of video processing object detection techniques. It begins with an abstract describing the goal of object detection in images and videos and challenges involved. It then discusses benefits of object detection and provides a literature review summarizing the approaches of 15 other research papers on object detection, including approaches using background subtraction, segmentation, feature extraction and deep learning algorithms. The document concludes by stating that object detection has wide applications and research is ongoing to improve accuracy and robustness of detection.
Object detection is a computer technology related to computer vision and image processing that deals with detecting instances of semantic objects of a certain class (such as humans, buildings, or cars) in digital images and videos.
A Small Helping Hand from me to my Engineering collegues and my other friends in need of Object Detection
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The Extraction of Spatial Features from remotely sensed data and the use of this information as input into further decision making systems such as geographical information systems (GIS) has received considerable attention over the few decades. The successful use of GIS as a decision support tool can only be achieved, if it becomes possible to attach a quality label to the output of each spatial analysis operation. Thus the accuracy of Spatial Feature Extraction gained more attention as geographic features can hardly formulated in a certain pattern due to intra-class variation and inter-class similarity. Besides these Spatial Feature Extraction further include positional uncertainty, attribute uncertainty, topological uncertainty, inaccuracy, imprecision/inexactitude, inconsistency, incompleteness, repetition, vagueness, noisy, omittance, misinterpretation, misclassification, abnormalities and knowledge uncertainty. To control and reduce uncertainty in an acceptable degree, a Probabilistic shape model is described for Extracting Spatial Features from multi-spectral image. The advantages of this, as opposed to the conventional approaches, are greater accuracy and efficiency, and the results are in a more desirable form for most purposes.
A Critical Survey on Detection of Object and Tracking of Object With differen...Editor IJMTER
Basically object detection and object tracking are two important and challenging aspects in
many computer vision applications like surveillance system, vehicle navigation, autonomous robot
navigation, compression of video etc. Object detection is first low level important task for any video
surveillance application. To detection of moving object is a challenging task. Tracking is required in
higher level applications that required the location and shape of object. There are three key steps in
video analysis: detection of interesting moving objects, tracking of such objects from frame to frame,
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human and vehicle is currently most active research topic. A lot of research has been undergoing
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Unit 3 covers image processing and computer vision topics including image formation, tagging, classification, object detection, recognition, and segmentation using deep learning algorithms. Key topics include how images are formed through light reflection and projection on the retina similar to a pinhole camera. Image tagging involves labeling images with keywords to make them searchable. Object detection combines classification and localization to identify and locate multiple objects in an image using bounding boxes and class labels. Deep learning methods like RCNN and Faster RCNN use convolutional neural networks for object detection in two stages by first generating proposals and then classifying proposals.
Wireless Vision based Real time Object Tracking System Using Template MatchingIDES Editor
In the present work the concepts of template
matching through Normalized Cross Correlation (NCC) has
been used to implement a robust real time object tracking
system. In this implementation a wireless surveillance pinhole
camera has been used to grab the video frames from the non
ideal environment. Once the object has been detected it is
tracked by employing an efficient Template Matching
algorithm. The templates used for the matching purposes are
generated dynamically. This ensures that any change in the
pose of the object does not hinder the tracking procedure. To
automate the tracking process the camera is mounted on a
disc coupled with stepper motor, which is synchronized with a
tracking algorithm. As and when the object being tracked
moves out of the viewing range of the camera, the setup is
automatically adjusted to move the camera so as to keep the
object of about 360 degree field of view. The system is capable
of handling entry and exit of an object. The performance of
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including a variety of disturbances and a means to detect a
loss of track.
This document summarizes a research paper on tracking moving objects and determining their distance and velocity using background subtraction algorithms. It first describes background subtraction as a process to extract foreground objects from video by comparing each frame to a background model. It then discusses several algorithms used in the research, including median filtering for noise removal, morphological operations to smooth object regions, and connected component analysis to detect large foreground regions representing objects. The document evaluates these techniques on video to track a single object, determine the distance and velocity of that object between frames, and identify multiple moving objects.
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In this paper we have considered illustrating a few techniques. But the numbers of techniques are so large they cannot be all addressed. Image segmentation forms the basics of pattern recognition and scene analysis problems. The segmentation techniques are numerous in number but the choice of one technique over the other depends only on the application or requirements of the problem that is being considered. Analysis of cluster is a descriptive assignment that perceive homogenous group of objects and it is also one of the fundamental analytical method in facts mining. The main idea of this is to present facts about brain tumour detection system and various data mining methods used in this system. This is focuses on scalable data systems, which include a set of tools and mechanisms to load, extract, and improve disparate data power to perform complex transformations and analysis will be measured between the way of measuring the Furrier and Wavelet Transform distance. Sandeep | Jyoti Kataria "Hybrid Approach for Brain Tumour Detection in Image Segmentation" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33409.pdf Paper Url: https://www.ijtsrd.com/medicine/other/33409/hybrid-approach-for-brain-tumour-detection-in-image-segmentation/sandeep
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1. Kartik Umesh Sharma & Nileshsingh V. Thakur
International Journal of Image Processing (IJIP), Volume (8) : Issue (5) : 2014 278
An Approach For Single Object Detection In Images
Kartik Umesh Sharma karthik8777@gmail.com
Department of PG Studies (Computer Science and Engineering)
Prof Ram Meghe Collge of Engineering and Management
Badnera-Amravati. 444701, INDIA
Nileshsingh V. Thakur thakurnisvis@rediffmail.com
Department of PG Studies (Computer Science and Engineering)
Prof Ram Meghe Collge of Engineering and Management
Badnera-Amravati. 444701, INDIA
Abstract
This paper discusses an approach for object detection and classification. Object detection
approaches find the object or objects of the real world present either in a digital image or a video,
where the object can belong to any class of objects. Humans can detect the objects present in an
image or video quite easily but it is not so easy to do the same by machine, for this, it is
necessary to make the machine more intelligent. Presented approach is an attempt to detect the
object and classify the same detected object to the matching class by using the concept of
Steiner tree. A Steiner tree is a tree in a distance graph which spans a given subset of vertices
(Steiner Points) with the minimal total distance on its edges. For a given graph G, a Steiner tree is
a connected and acyclic sub graph of G. This problem is called as Steiner tree problem where the
aim is to find a Steiner minimum tree in the given graph G. Basically the process of object
detection can be divided as object recognition and object classification. A Multi Scale Boosted
Detector is used in the presented approach, which is the combination of multiple single scale
detectors; in order to detect the object present in the image. Presented approach makes use of
the concept of Steiner tree in order to classify the objects that are present in an image. To know
the class of the detected object, the Steiner tree based classifier is used. In order to reach to the
class of the object, four parameters namely, Area, Eccentricity, Euler Number and Orientation of
the object present in the image are evaluated and these parameters form a graph keeping each
parameter on independent level of graph. This graph is explored to find the minimum Steiner tree
by calculating the nearest neighbor distance. Experimentations are carried out using the standard
LabelMe dataset. Obtained results are evaluated based on the performance evaluation
parameters such as precision and recall.
Keywords: Object Detection, Steiner Tree, Object Classification.
1. INTRODUCTION
Object detection (OD) is a technologically challenging and practically useful problem in the field of
computer vision and it has seen significant advances in the last few years [1]. Object detection
deals with identifying the presence of various individual objects in an image. Humans perform
object recognition effortlessly and instantaneously. Algorithmic description of this task for
implementation on machines has been very difficult. Basic object detection model is shown in
Figure 1. Basically an OD system can be described easily by seeing Figure 1, which shows the
basic stages that are involved in the process of object detection. The basic input to the OD
system can be an image or a scene in case of videos. The basic aim of this system is to detect
objects that are present in the image or scene or simply in other words the system needs to
categorize the various objects into respective object classes. The object detection problem can
be defined as a labeling problem based on models of known objects. Given an image containing
one or more objects of interest and a set of labels corresponding to a set of models known to the
2. Kartik Umesh Sharma & Nileshsingh V. Thakur
International Journal of Image Processing (IJIP), Volume (8) : Issue (5) : 2014 279
system, the system is expected to assign correct labels to regions in the image. The object
detection problem cannot be solved until the image is segmented and without at least a partial
detection, segmentation process cannot be applied. The term detection has been used to refer to
many different visual abilities including identification, categorization and discrimination.
This paper presents a object detection mechanism which not only detects the desired object in
the image but also classifies the detected object. Multi scale boosted detector is used in order to
detect the object of interest and a Steiner tree based classifier which uses the nearest neighbor
concept in order to classify the detected objects.
FIGURE 1: Basic Object Detection Model.
A Steiner tree is a tree in a distance graph which spans a given subset of vertices (Steiner Points)
with the minimal total distance on its edges. Given a graph G = (V, E), a subset R ⊆ V of vertices,
and a length function d: E→ℜ
+
on the edges, a Steiner tree is a connected and acyclic sub graph
of G which spans all vertices of R. The vertices in R are usually referred to as terminals and the
vertices in V R as Steiner (or optional) vertices.
FIGURE 2: Example for Steiner Tree.
The length of this Steiner tree is 2+2+2+2+4 = 12.
The so-called Steiner tree problem (STP) is an NP- hard [2], but can be approximated efficiently
[3, 4]. The STP is a problem to find a Steiner minimum tree. (i.e., a Steiner tree of minimum
length) in the graph G. Example for Steiner tree is shown in Figure 2. The Steiner tree problem is
distinguished from the minimum spanning tree problem in that we are permitted to construct or
select intermediate connection points to reduce the cost of the tree.
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2. LITERATURE REVIEW
Object detection can classified into the following types as Sliding Window based, Contour based,
Graph based, Fuzzy based, Context based and some other types. Here we will review the work
carried out by various authors in the field of Object Detection.
Sliding window based detection. The sliding window approach is common in object detection
[5, 6, 7], and much work has been carried out to improve the running time for detecting an object.
Although Segvic et al. [5] have explained how localization accuracy could be achieved by
removing the need for spatial clustering of the nearby detection responses, but the use of spatial
clustering can be done at the cost localization uncertainty. Subburaman et al. [6] have presented
a technique which is used to reduce the number of miss detections while increasing the grid
spacing while the sliding window approach is used for object detection. Comaschi et al. [7] have
proposed a sliding window approach that decides on the step size of the window at run time,
which helps to apply this technique of sliding window to real time applications. They have also
demonstrated that how this technique improves the performance of Viola Jones object detection
[8], and also claimed to have achieved a speedup of 2.03x in frames per second without
compromising the accuracy factor. The main issue being the space utilized.
Contour based detection. Contour based object detection can be well formulated as a matching
problem between model contour parts and image edge fragments, and hence Yang et al. [9] have
used this problem and have treated it as a problem of finding dominant sets in weighted graphs,
where the nodes of the graph are pairs composed of contour parts and edge fragments and the
weights between nodes are based on shape similarity. The main advantage of this system is that
it can detect multiple objects present in an image in one pass. Still the question arises that can
this system detect objects in an occluded image or other types of images. Amine and Farida, [10]
have proposed an approach which makes use of a deformable model “Snake” which they have
termed as an active contour for segmenting the range images. The process is again restricted to
range images; the question still lies about the various types of images.
The system proposed by Shotton et al. [11] not only recognizes objects based on local contour
features but also is capable of localizing the object in space and scale in the image. Fragments of
contours could be a good idea to guess the object but here lies a question that how many
fragments could be feasible.
Graph based detection. Model-based methods play a central role to solve different problems in
computer vision. A particular important class of such methods relies on graph models where an
object is decomposed into a number of parts, each one being represented by a graph vertex.
Felzenszwalb and Huttenlocher, [12] have addressed the problem of segmenting an image into
regions; this is achieved by defining a predicate in order to measure an evidence for a boundary
between two regions by making use of a graph based representation of the image and by
developing an efficient segmentation algorithm based on the predicate defined earlier. However
finding a segmentation that is neither too coarse nor too fine is an NP-hard problem, hence there
remains a huge scope in redesigning this method of image segmentation and to get good results.
Dasigi and Jawahar, [13] have discussed a representation scheme for efficiently modeling parts
based representation and matching them, as graphs can be used for effective representation of
images for detection and retrieval of objects, the problem of finding a proper structure which can
efficiently describe an image and can be matched in low computational expense remains a
problem. They in their discussion have compared two graphical representations namely the
Nearest-Neighbor Graphs and the Collocation Tress, for the goodness of fit and the
computational expense involved in matching. A graph model based tracking algorithm which
generate a model for a given frame termed as reference frame was used to track a target object
in the subsequent frames.
Gunduz-Demir et al. [14] have presented a new approach to gland segmentation which
decomposes the tissue image into a set of primitive objects and segments glands making use of
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the organizational properties of these objects, which are quantified with the definition of object-
graphs.
Fuzzy based detection. Kim et al. [15] have proposed an object recognition processor which
lightens the workload by estimating the global region of interest (ROI). This estimation of ROI is
performed by a neuro-fuzzy controller and this controller also manages the processors overall
pipeline stages by using workload aware task scheduling. As pipelining is introduced here raises
a question of parallel pipelining. Lopes et al. [16] have introduced an object tracking approach
which is based on fuzzy concepts. The tracking task is performed through the fusion of these
fuzzy models by means of an inference engine. Here the object properties considered are very
basic, the properties like shape and textures etc. have not been considered.
Rajakumar et al. [17] have proposed a fuzzy filtering technique for contour detection; the fuzzy
logic is basically applied to extract value for an image which is used for edge detection. In their
approach, the threshold parameter values are obtained from the fuzzy histograms of an input
image, and the fuzzy inference method selects the complete information about the border of the
object. Their proposed system works for gray images, but the question whether this system is
feasible under occlusion or cluttered image remains a question.
Context based detection. Perko and Leonardis, [18] have presented a framework for visual-
context aware object detection; authors have tried to extract visual contextual information from
images which can be used prior to the process of object detection. In addition, bottom-up saliency
and object co-occurrences are used in order to define auxiliary visual context. Finally all the
individual contextual cues are integrated with local appearance based object detector by using a
fully probabilistic framework. This system is tested on still images, can it work on other types of
images remains an issue.
Peralta et al. [19] have presented a method which learns adaptive conditional relationships that
depend on the type of scene being analyzed. Basically they have proposed a model based on a
conditional mixture of trees which is able to capture contextual relationships among objects using
global information about an image. Relationships between objects in an image could be formed
only when the image is clear enough but what if the image is occluded. Object categorization
makes use of appearance information and context information in order to improve the object
recognition accuracy. Galleguillos and Belongie, [20] have addressed the problem of
incorporating different types of contextual information for object categorization and have also
reviewed the different ways of using contextual information for object categorization. Contextual
information would be accurate, once the images are labeled which will not be the case always
hence efficiency of this approach could be an issue.
Other Mechanisms. Torrent et al. [21] have proposed a framework to simultaneously perform
object detection and segmentation on objects of different nature, which is based on a boosting
procedure which automatically decides – according to the object properties – whether it is better
to give more weight to the detection or segmentation process to improve both results. Their
approach allows information to be crossed from detection to segmentation and vice versa. The
timing of this task may increase if initially the object detected is not the one of interest.
Hussin et al. [22] have discussed about the various techniques on how to detect the mango from
a mango tree. The techniques are color processing which is used as primary filtering to eliminate
the unrelated color or object in the image. Besides that, shape detection are been used where it
will use the edge detection, Circular Hough Transform (CHT). Laptev, [23] presented a method
for object detection that combines AdaBoost learning with local histogram features. He had
introduced a weak learner for multi valued histogram features and also analyze various choices of
image features. Histogram based descriptors can be feasible only when the image is natural and
clear. It may not be feasible when the image is occluded or cluttered.
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Steiner tree. Hambrusch and TeWinkel [24] have considered the problem of determining a
minimum cost rectilinear Steiner tree when the input image is an n*n binary image I which is
stored in an n*n mesh of processors. They have tried to make their work cost effective by
avoiding sorting and routing operations that are expensive in practice. They have also presented
parallel algorithms for the Steiner tree problem when an n*n binary image I which is stored in an
n*n mesh of processors with one pixel per processor. Lin et al. [25] have developed an Obstacle
Avoiding Rectilinear Steiner Minimal Tree (OARSMT) which when given a set of points and a set
of obstacles on a plane, the OARSMT connects the pins, possibly through some additional points
called the Steiner points and avoids running through any obstacle to construct a tree with minimal
total wire length.
Liu and Sechen [26] have presented a chip-level global router based on routing model for the
multilayer macro-cell technology. The routing model uses a three-dimensional mixed
directed/undirected routing graph, which provides not only the topological information but also the
layer information. The irregular routing graph closely models the multilayer routing problem, so
the global router can give an accurate estimate of the routing resources needed. Router
searching is formulated as the Steiner problem in networks (graph Steiner tree problem).
Apart from above related work, in [27] a detailed literature review for the various kinds of
detection mechanisms is carried out.
3. PROPOSED APPROACH
Although for human beings, the recognition of familiar objects of any kind and in any sort of
environment may be a simple task, but the process of recognition is still a huge difficulty for
computers. Especially the situations where there are changes in light or there is some sort of
movements in space make images of a same kind look entirely different. On the other hand, the
number of instruments that are able to capture images from day to day life has increased
drastically. And hence as a result, object detection has become a real challenge, in particular to
be able to classify such huge amounts of data. Most of the approaches treat object detection as a
complex process that requires powerful computers to run, the aim of the presented approach is to
recognize the object present in the image and at the same time classify the object that is obtained
through the recognition step.
Presented work basically deals with detecting and classifying the objects in images using a
Steiner tree. To classify the objects in the images is modeled as Steiner tree problem. Steiner
tree problem basically deals with finding the minimum path between the given set of vertices. The
sole aim in the Steiner tree problem is to minimize the cost of Steiner tree. As it is an optimization
problem and NP-hard problem, the scope of research contribution exists. The basic sliding
window approach for object detection analyses a large number of image regions (of the order of
50,000 regions for a 640x480 pixel image) to know which of the region may contain the object of
interest. And in case of many applications there is a need for recognizing multiple object classes,
and hence multiple binary classifier are required to run over each region and thus if 10 object
classes need to be detected, the sliding window approach may require 500,000 classifications per
image.
Hence there is a need for analyzing only those regions in a particular image that have a higher
probability of containing the object of interest. In the presented approach a Steiner Tree based
classifier is used to classify the objects present in a particular image. Here Steiner tree is used in
order to decide upon the minimum path between the nodes present at the same level of the tree,
whereas a Multi Scale Boosted Detector is used for recognizing the objects in the image. The
detailed internal working of the approach for the purpose of classification of an object is explained
in the Figure 3, i.e. the flow diagram of the presented approach and the implementation steps.
Implementation Steps for Object Detection and Classification:
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Input: Image containing an Object of Interest
Output: Detected Object of Interest and the Class to which it belongs.
• Training Phase
Step 1: The user is required to enter the number of images for the training purpose.
Step 2: Now the user is asked to enter some description for the object present in the selected
images so that the classifier knows what exactly the class of the object in the image is.
Step 3: Now, we get the detected region of the object along with the values for the four different
parameters which are: Area, Eccentricity, Euler Number and Orientation for that particular image.
Step 4: Repeat this procedure for a certain number of images of a particular class of objects so
that the classifier gets to know the range of values of the 4 parameters for each object class.
Start
If TrainingYesYes NoNo
Enter No. of
Images for
Training
Enter No. of
Images to Detect
Objects
Enter some
Description
Apply Single
Scale Boosted
Detector
Compute
Features: A, Ecc,
Eu, O
Detected Object
Compute Mean
Value of
Features
Classifier Runs
Class of the
Object
Compute
Features: A, Ecc,
Eu, O
Apply Single
Scale Boosted
Detector
Detected Object
Stop
FIGURE 3: Detailed Flow Diagram of the Presented Approach and Implementation Steps.
• Evaluation Phase
Step 5: In this phase, the user is asked to enter the number of images in which he needs to
detect the objects.
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Step 6: Repeat step 3 so as to obtain the detected object of interest and to get the values for the
parameters.
Step 7: The classifier makes use of the values of parameters obtained in step 6 so as to get the
class of the object present in the image.
3.1 Object Detection
Distinguishing between the foregrounds objects from the stationary background image is a
significant as well as a difficult research problem. Almost all the approaches for object detection
or tracking have their first step as detecting the foreground objects. In order to detect the object
present in the foreground, the presented approach makes use of a Gentle Boost Algorithm.
Basically, in order to detect the objects present in the foreground, initially the classifier needs to
be trained and only then the testing of the detector can be done. Hence the following part of this
section explains the training and testing phase of the detector.
3.1.1 Detector Training
Detecting an object is a fundamental problem in computer vision: given an image, which object
categories are present and where in the image are the objects located are some of the basic
queries related to object detection. Almost all the best performing detection methods employ
discriminative learning together with window based search, and assume that a large number of
labeled training examples are available. For instance, thousands of bounding box annotations per
class is a standard. More data is always advantageous and that is the reason researchers have
began to explore various ways of collecting labeled data. The process of learning acts more
informative for the detector in order to detect properly and improve the accuracy of detection.
FIGURE 4: Steps for Detector Training.
Figure 4 depicts the way in which the detector is trained so as to get the accurate objects present
in a particular image. During the training phase, initially in order to detect the objects of a specific
class, 8 images in which one object of the class of interest appears is picked. In the pre-
processing step, the x-derivative, y-derivative and Laplacian of the images are generated and are
added to the original set of images. In the next step, a patch from the centre of the object is
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sampled and is labeled as +1 where as the other patches from the background are labeled as -1.
This process of labeling is repeated for various different patch sizes and is stored in a dictionary.
Further in the training phase, the cross correlation between the patch dictionary obtained earlier
and the training images is calculated and the features at sample locations on the background
region where the templates produce strong false alarms are recorded. And the positive samples
are located at the centre of the object which is termed as the local maxima of the score in the
object region. And finally the computed features are passed to the Gentle Boost Algorithm which
in turn builds the detectors.
3.1.2 Detector Testing
During the training phase the presented approach has considered 200 images of a particular
class. And hence the detector is trained on a total of 400 images belonging to two object classes
and the features are computed for the images and stored which is used during the testing of the
detector in order to see whether he detector is properly trained or not. Figure 5 shows the steps
involved while testing the detector.
FIGURE 5: Steps for Detector Testing.
At testing time, the cross correlation between the test image and the dictionary of patches is
computed first and then the regression stump is evaluated and is termed as a “weak learner”. And
in order to obtain more accurate and efficient results, a number of weak detectors are combined
to form a strong detector. This is basically done in order to detect an object having different
viewpoints.
3.2 Object Classification
Approaches for visual classification basically proceed in two stages, firstly, features are extracted
from the image and the object to be classified is represented using the obtained features.
Secondly, a classifier is applied to the measured features to reach to a decision regarding the
class of the obtained object.
3.2.1 Classifier Training
The presented approach makes use of the Steiner tree based classifier for the purpose of
classifying the objects that are detected in the image. For the purpose of training the classifier,
four features have been considered namely: Area, Eccentricity, Euler Number and Orientation.
For every image, these four features are calculated and are stored. At the end of the training, the
mean values for the various features are calculated.
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The classifier in the training phase gets to know the range for all the four features that are
calculated for every class of the object. This range will be used by the classifier to obtain the
class for a particular class of the object.
3.2.2 Classifier Testing
During the testing phase, the image that is given as input has to go through the same steps that
are carried out in the training phase. For an input image, the pre processing is done and the
values for the four features are calculated. The values that are calculated for the different features
are then matched with the mean values for each particular feature and accordingly the classifier
makes use of the nearest neighbor evaluation in order to justify the class to which the detected
object belongs to. The Figure 6 shows an overview of how this process is carried out and how the
concept of Steiner tree comes into play.
FIGURE 6: Decision Making Tree for Classifier.
Figure 6 comprises of four different levels, each corresponding to a specific feature. The sole aim
of this phase is to get the class of the object that has been detected in the input image. And
hence for this purpose, during the training phase of the classifier, the values of the features are
calculated and the mean value is stored.
For an input image, during the testing phase, the values for the four features are calculated and
are matched with those values which are obtained during the training phase. Now, if for an image,
the value obtained for a feature is not present as a node, then in that case to avoid inaccurate
results, the Steiner nodes are used. In the Figure 6, the colored nodes represent the Steiner
nodes that would connect the different levels in the tree structure in order to reach the class of the
detected object.
The presented approach makes use of the nearest neighbor evaluation to get the value of edge
between the newly generated Steiner node and the MIN & MAX node of the value of each
feature, like Area, on the same level of the graph. Figure 7 explains the working of the Steiner
node.
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International Journal of Image Processing (IJIP), Volume (8) : Issue (5) : 2014 287
FIGURE 7: Finding the Shortest Path.
It can be seen from Figure 7, the range of classes is known a priori, but as can be seen there
exists an overlapping region and if the value of the feature fall in the overlapping region then in
that case the Steiner node evaluates on shortest path to the nearest node and decides the class
of the object. And if the value of the feature does not fall in the overlapping region then the
decision about the class of the object is done directly as the ranges are known. Based on the
edge value, the decision of the class is drawn. If the edge value between the Steiner node and
the MIN node is less than the edge value of Steiner node and the MAX node, then the concerned
class of the Area value which is obtained for query image is ‘CAR’.
In the above case, the two distances DCAR and DSCR are evaluated and the distance which is less
will be the class to which the query object belongs. This procedure is performed at each level for
the different features. And hence as the value of DCAR is less, the class of the object is decided as
‘CAR’ and vice-versa.
4 EXPERIMENTAL RESULTS & DISCUSSION
4.1 Results
Initially in the pre-processing step, the patch from the centre of the object is sampled and is
labeled as +1 while the other patches from the background are labeled -1. It can be seen from the
Figure 8, the patch at the centre of the computer screen and car which are the objects in this
case, are colored red representing +1 while the other patches on the screen are represented
using the green color. This procedure is repeated for a sample of 8 images and is stored in the
dictionary and hence is termed as dictionary of patches.
Further, during the training phase, the cross correlation between the dictionary patches and the
training images are calculated along with the features at sample locations in the background
region are recorded. The obtained features are then passed to a Gentle Boost Detector in order
to build the detectors. After finishing off with the training of the detector, now the classifier needs
to be trained, this is what is depicted in Figure 9. During the training of the classifier, the value for
the four parameters namely: area, eccentricity, Euler number and orientation are calculated.
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FIGURE 8: Patch Plotting.
FIGURE 9: Training for the Classifier when class is Computer Screen.
FIGURE 10: Training for the Classifier when Class is Car.
During the evaluation phase, the user enters the number of images he wants to detect and
classify objects in and for each image, the values of the four features are obtained and those
values are used by the classifier in order to finalize the class to which the object in the image
belongs to as shown in Figure 10 and Figure 11. The classifier works on the principle of nearest
neighbor evaluation (distance evaluation DCAR and DSCR) for each feature and in cases of a tie,
the results are broken arbitrarily.
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FIGURE 10: Evaluation of the Classifier for class Computer Screen.
FIGURE 11: Evaluation of the Classifier for class Car.
4.2 Discussion
In order to evaluate the performance of the approach the standard parameters: the precision,
recall or F-measure (combination of both precision and recall) are considered. In information
retrieval contexts, precision and recall are defined in terms of a set of retrieved documents and a
set of relevant documents.
Precision:
In information retrieval contexts, precision is the fraction of retrieved documents that are relevant
to the find:
{ } { }
{ }
relevant retrieved
precision
retrieved
∩
=
Precision takes all retrieved images into account, but it can also be evaluated at a given cut-off
rank, considering only the topmost results returned by the system. This measure is called
precision at n. For example, for a text search on the set of documents, precision is the number of
correct results divided by the number of all returned results.
Recall:
Recall in information retrieval is the function of the documents that are relevant to the query that
are successfully retrieved.
{ } { }
{ }
relevant retrieved
recall
relevant
∩
=
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Number of
Images
Recall Precision
5 0.1 1
10 0.2 1
15 0.3 1
20 0.4 1
25 0.5 0.9
30 0.55 0.6
35 0.6 0.4
40 0.7 0.2
45 0.8 0.1
TABLE 1: Values of Precision and Recall for class Computer Screen.
Number of
Images
Recall Precision
5 0.1 1
10 0.15 1
15 0.18 0.9
20 0.2 0.8
25 0.3 0.65
30 0.55 0.4
35 0.65 0.3
40 0.8 0.2
45 0.9 0.1
TABLE 2: Values of Precision and Recall for class Car.
For the purpose of classification tasks, the terms like true positives, true negatives, false positives
and false negatives. The terms positive and negative refer to the classifiers prediction, and the
terms true and false refer to whether that prediction corresponds to the external judgment.
The performance of the presented approach is evaluated on the standard LabelMe dataset. The
360 images remaining after the training of the detector are used for training and evaluation of the
classifier. The images are scaled down to 256x256 resolutions. Values of Precision and Recall for
Computer Screen and the Car class are summarized in the Table 1 and Table 2 respectively, for
the nine experimental simulation runs. Precision and Recall curves are plotted for the Computer
Screen and Car classes which are shown in Figure 11. The values of precision and recall share
an inverse relationship between themselves
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FIGURE 11: Precision and Recall Curve for Computer Screen and Car Classes.
5 CONCLUSION
The presented approach is for the detection of the objects present in the image and classification
of the detected object. The presented approach makes use of Gentle Boost Detector in order to
detect the object in an image and apart from this in order to classify the object in the image;
Steiner tree based classifier is made used. Although there are many approaches developed for
detecting objects, the presented approach uses the Steiner tree for classification purpose. The
detection process is improved in accuracy by making use of multiple weak classifiers and the
process of classification makes use of the concept of Steiner tree. Based on the results obtained
for the precision and recall, it is observed that the presented approach is performing well for the
different images. With reference to the experiments carried out for the detection and classification
of the query image of the Car and Computer Screen class, the data collected through different
simulations justify the accuracy of the presented approach.
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