Tracking is the problem of estimating the trajectory of an object as it moves around a scene. Motion tracking involves collecting data on human movement using sensors to control outputs like music or lighting based on performer actions. Motion tracking differs from motion capture in that it requires less equipment, is less expensive, and is concerned with qualities of motion rather than highly accurate data collection. Optical flow estimates the pixel-wise motion between frames in a video by calculating velocity vectors for each pixel.
Slide for Multi Object Tracking by Md. Minhazul Haque, Rajshahi University of Engineering and Technology
* Object
* Object Tracking
* Application
* Background Study
* How it works
* Multi-Object Tracking
* Solution
* Future Works
Computer vision has received great attention over the last two decades.
This research field is important not only in security-related software but also in the advanced interface between people and computers, advanced control methods, and many other areas.
The document discusses object tracking in computer vision. It begins with an introduction and overview of applications of object tracking. It then discusses object representation, detection, tracking algorithms and methodologies. It compares different tracking methods and provides an example of object tracking in MATLAB. Key steps in object tracking include object detection, tracking the detected objects across frames using algorithms like point tracking, kernel tracking and silhouette tracking. Common challenges with object tracking are also summarized.
This document summarizes several methods for real-time object detection and tracking in video sequences. Traditional methods like absolute differences and census transforms are compared to modern methods like KLT (Lucas-Kanade Technique) and Meanshift. Hardware requirements for real-time tracking like memory, frame rate, and processors are also discussed. The document provides examples of applications for object detection and tracking in traffic monitoring, surveillance, and mobile robotics.
The KLT tracker is a classic algorithm for visual object tracking published in 1981. It works by tracking feature points between consecutive video frames using the Lucas-Kanade optical flow method. The KLT tracker is still widely used due to its computational efficiency and availability in many computer vision libraries. However, it is best suited for tracking textured objects and may struggle with uniform textures or large displacements between frames.
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. Well-researched domains of object detection include face detection and pedestrian detection. Object detection has applications in many areas of computer vision, including image retrieval and video surveillance.
Slide for Multi Object Tracking by Md. Minhazul Haque, Rajshahi University of Engineering and Technology
* Object
* Object Tracking
* Application
* Background Study
* How it works
* Multi-Object Tracking
* Solution
* Future Works
Computer vision has received great attention over the last two decades.
This research field is important not only in security-related software but also in the advanced interface between people and computers, advanced control methods, and many other areas.
The document discusses object tracking in computer vision. It begins with an introduction and overview of applications of object tracking. It then discusses object representation, detection, tracking algorithms and methodologies. It compares different tracking methods and provides an example of object tracking in MATLAB. Key steps in object tracking include object detection, tracking the detected objects across frames using algorithms like point tracking, kernel tracking and silhouette tracking. Common challenges with object tracking are also summarized.
This document summarizes several methods for real-time object detection and tracking in video sequences. Traditional methods like absolute differences and census transforms are compared to modern methods like KLT (Lucas-Kanade Technique) and Meanshift. Hardware requirements for real-time tracking like memory, frame rate, and processors are also discussed. The document provides examples of applications for object detection and tracking in traffic monitoring, surveillance, and mobile robotics.
The KLT tracker is a classic algorithm for visual object tracking published in 1981. It works by tracking feature points between consecutive video frames using the Lucas-Kanade optical flow method. The KLT tracker is still widely used due to its computational efficiency and availability in many computer vision libraries. However, it is best suited for tracking textured objects and may struggle with uniform textures or large displacements between frames.
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. Well-researched domains of object detection include face detection and pedestrian detection. Object detection has applications in many areas of computer vision, including image retrieval and video surveillance.
Object Detection using Deep Neural NetworksUsman Qayyum
Recent Talk at PI school covering following contents
Object Detection
Recent Architecture of Deep NN for Object Detection
Object Detection on Embedded Computers (or for edge computing)
SqueezeNet for embedded computing
TinySSD (object detection for edge computing)
Object detection is a main role in image processing.the proposed methods detect various multiple object detection using image processing so provide a really to solving the security problem.
This document summarizes object tracking methods, including representations of objects, features for tracking, detection approaches, tracking algorithms, and future directions. It discusses representing objects as points, patches, or contours, using features like color, edges, texture, and optical flow for detection and tracking. Detection can be done through point detection, background subtraction, segmentation, and supervised learning. Tracking algorithms include point tracking, kernel tracking, and silhouette tracking. The document outlines challenges like occlusion, camera motion, and non-rigid objects that remain for future work in object tracking.
This document discusses object detection using the Single Shot Detector (SSD) algorithm with the MobileNet V1 architecture. It begins with an introduction to object detection and a literature review of common techniques. It then describes the basic architecture of convolutional neural networks and how they are used for feature extraction in SSD. The SSD framework uses multi-scale feature maps for detection and convolutional predictors. MobileNet V1 reduces model size and complexity through depthwise separable convolutions. This allows SSD with MobileNet V1 to perform real-time object detection with reduced parameters and computations compared to other models.
Deep learning based object detection basicsBrodmann17
The document discusses different approaches to object detection in images using deep learning. It begins with describing detection as classification, where an image is classified into categories for what objects are present. It then discusses approaches that involve separating detection into a classification head and localization head. The document also covers improvements like R-CNN which uses region proposals to first generate candidate object regions before running classification and bounding box regression on those regions using CNN features. This helps address issues with previous approaches like being too slow when running the CNN over the entire image at multiple locations and scales.
Object detection and Instance SegmentationHichem Felouat
The document discusses object detection and instance segmentation models like YOLOv5, Faster R-CNN, EfficientDet, Mask R-CNN, and TensorFlow's object detection API. It provides information on labeling images with bounding boxes for training these models, including open-source and commercial annotation tools. The document also covers evaluating object detection models using metrics like mean average precision (mAP) and intersection over union (IoU). It includes an example of training YOLOv5 on a custom dataset.
The document discusses object detection pipelines. It begins by defining object detection as identifying objects in images and locating them with bounding boxes. The main components of an object detection pipeline are datasets, preprocessing, model selection and training, testing and evaluation. Popular models discussed are Faster R-CNN, R-FCN, and SSD which use deep convolutional neural networks as feature extractors and classifiers. Key evaluation metrics are mean average precision and prediction time/memory usage. Popular datasets mentioned are MSCOCO, Pascal VOC, and LSVRC. The document provides information on preprocessing, training including fine-tuning pre-trained models, and codes/models available on GitHub.
OpenCV is an open-source library for computer vision and machine learning. The document discusses OpenCV's features including its modular structure, common computer vision algorithms like Canny edge detection, Hough transform, and cascade classifiers. Code examples are provided to demonstrate how to implement these algorithms using OpenCV functions and data types.
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
The document presents a method for detecting moving objects using RGB content and illumination calculations. It describes an algorithm that detects changes in RGB values and illumination as an object moves or the camera position changes. The method was tested on stationary objects, partially moving objects, and fully moving objects to measure changes in illumination. It was found to successfully detect object movement based on differences in illumination and RGB configuration between stationary and moving object states. Limitations include difficulty detecting objects in dark conditions and slow moving objects. Potential applications mentioned are security systems and speech recognition devices.
https://telecombcn-dl.github.io/2017-dlcv/
Deep learning technologies are at the core of the current revolution in artificial intelligence for multimedia data analysis. The convergence of large-scale annotated datasets and affordable GPU hardware has allowed the training of neural networks for data analysis tasks which were previously addressed with hand-crafted features. Architectures such as convolutional neural networks, recurrent neural networks and Q-nets for reinforcement learning have shaped a brand new scenario in signal processing. This course will cover the basic principles and applications of deep learning to computer vision problems, such as image classification, object detection or image captioning.
Object detection is an important computer vision technique with applications in several domains such as autonomous driving, personal and industrial robotics. The below slides cover the history of object detection from before deep learning until recent research. The slides aim to cover the history and future directions of object detection, as well as some guidelines for how to choose which type of object detector to use for your own project.
Face detection uses computer vision and image processing techniques to classify and localize faces within images. It involves detecting faces, identifying key facial features, and determining their locations. Common methods include semantic and instance segmentation using convolutional neural networks, as well as YOLO-based approaches that divide images into grids and predict detection bounding boxes and confidence scores for each grid cell. Face detection performance is typically evaluated using metrics like average precision (AP) and mean average precision (mAP) which measure accuracy of localization across different probability thresholds or object sizes. It has various applications including face unlock, person identification, and video surveillance.
This document provides an introduction to multiple object tracking (MOT). It discusses the goal of MOT as detecting and linking target objects across frames. It describes common MOT approaches including using boxes or masks to represent objects. The document also categorizes MOT based on factors like whether it tracks a single or multiple classes, in 2D or 3D, using a single or multiple cameras. It reviews old and new evaluation metrics for MOT and highlights state-of-the-art methods on various MOT datasets. In conclusion, it notes that while MOT research is interesting, standardized evaluation metrics and protocols still need improvement.
http://imatge-upc.github.io/telecombcn-2016-dlcv/
Deep learning technologies are at the core of the current revolution in artificial intelligence for multimedia data analysis. The convergence of big annotated data and affordable GPU hardware has allowed the training of neural networks for data analysis tasks which had been addressed until now with hand-crafted features. Architectures such as convolutional neural networks, recurrent neural networks and Q-nets for reinforcement learning have shaped a brand new scenario in signal processing. This course will cover the basic principles and applications of deep learning to computer vision problems, such as image classification, object detection or text captioning.
Abstract: Noise in an image is a serious problem In this
project, the various noise conditions are studied which are:
Additive white Gaussian noise (AWGN), Bipolar fixedvalued impulse noise, also called salt and pepper noise
(SPN), Random-valued impulse noise (RVIN), Mixed noise
(MN). Digital images are often corrupted by impulse noise
during the acquisition or transmission through
communication channels the developed filters are meant for
online and real-time applications. In this paper, the
following activities are taken up to draw the results: Study
of various impulse noise types and their effect on digital
images; Study and implementation of various efficient
nonlinear digital image filters available in the literature
and their relative performance comparison;
Object Detection using Deep Neural NetworksUsman Qayyum
Recent Talk at PI school covering following contents
Object Detection
Recent Architecture of Deep NN for Object Detection
Object Detection on Embedded Computers (or for edge computing)
SqueezeNet for embedded computing
TinySSD (object detection for edge computing)
Object detection is a main role in image processing.the proposed methods detect various multiple object detection using image processing so provide a really to solving the security problem.
This document summarizes object tracking methods, including representations of objects, features for tracking, detection approaches, tracking algorithms, and future directions. It discusses representing objects as points, patches, or contours, using features like color, edges, texture, and optical flow for detection and tracking. Detection can be done through point detection, background subtraction, segmentation, and supervised learning. Tracking algorithms include point tracking, kernel tracking, and silhouette tracking. The document outlines challenges like occlusion, camera motion, and non-rigid objects that remain for future work in object tracking.
This document discusses object detection using the Single Shot Detector (SSD) algorithm with the MobileNet V1 architecture. It begins with an introduction to object detection and a literature review of common techniques. It then describes the basic architecture of convolutional neural networks and how they are used for feature extraction in SSD. The SSD framework uses multi-scale feature maps for detection and convolutional predictors. MobileNet V1 reduces model size and complexity through depthwise separable convolutions. This allows SSD with MobileNet V1 to perform real-time object detection with reduced parameters and computations compared to other models.
Deep learning based object detection basicsBrodmann17
The document discusses different approaches to object detection in images using deep learning. It begins with describing detection as classification, where an image is classified into categories for what objects are present. It then discusses approaches that involve separating detection into a classification head and localization head. The document also covers improvements like R-CNN which uses region proposals to first generate candidate object regions before running classification and bounding box regression on those regions using CNN features. This helps address issues with previous approaches like being too slow when running the CNN over the entire image at multiple locations and scales.
Object detection and Instance SegmentationHichem Felouat
The document discusses object detection and instance segmentation models like YOLOv5, Faster R-CNN, EfficientDet, Mask R-CNN, and TensorFlow's object detection API. It provides information on labeling images with bounding boxes for training these models, including open-source and commercial annotation tools. The document also covers evaluating object detection models using metrics like mean average precision (mAP) and intersection over union (IoU). It includes an example of training YOLOv5 on a custom dataset.
The document discusses object detection pipelines. It begins by defining object detection as identifying objects in images and locating them with bounding boxes. The main components of an object detection pipeline are datasets, preprocessing, model selection and training, testing and evaluation. Popular models discussed are Faster R-CNN, R-FCN, and SSD which use deep convolutional neural networks as feature extractors and classifiers. Key evaluation metrics are mean average precision and prediction time/memory usage. Popular datasets mentioned are MSCOCO, Pascal VOC, and LSVRC. The document provides information on preprocessing, training including fine-tuning pre-trained models, and codes/models available on GitHub.
OpenCV is an open-source library for computer vision and machine learning. The document discusses OpenCV's features including its modular structure, common computer vision algorithms like Canny edge detection, Hough transform, and cascade classifiers. Code examples are provided to demonstrate how to implement these algorithms using OpenCV functions and data types.
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
The document presents a method for detecting moving objects using RGB content and illumination calculations. It describes an algorithm that detects changes in RGB values and illumination as an object moves or the camera position changes. The method was tested on stationary objects, partially moving objects, and fully moving objects to measure changes in illumination. It was found to successfully detect object movement based on differences in illumination and RGB configuration between stationary and moving object states. Limitations include difficulty detecting objects in dark conditions and slow moving objects. Potential applications mentioned are security systems and speech recognition devices.
https://telecombcn-dl.github.io/2017-dlcv/
Deep learning technologies are at the core of the current revolution in artificial intelligence for multimedia data analysis. The convergence of large-scale annotated datasets and affordable GPU hardware has allowed the training of neural networks for data analysis tasks which were previously addressed with hand-crafted features. Architectures such as convolutional neural networks, recurrent neural networks and Q-nets for reinforcement learning have shaped a brand new scenario in signal processing. This course will cover the basic principles and applications of deep learning to computer vision problems, such as image classification, object detection or image captioning.
Object detection is an important computer vision technique with applications in several domains such as autonomous driving, personal and industrial robotics. The below slides cover the history of object detection from before deep learning until recent research. The slides aim to cover the history and future directions of object detection, as well as some guidelines for how to choose which type of object detector to use for your own project.
Face detection uses computer vision and image processing techniques to classify and localize faces within images. It involves detecting faces, identifying key facial features, and determining their locations. Common methods include semantic and instance segmentation using convolutional neural networks, as well as YOLO-based approaches that divide images into grids and predict detection bounding boxes and confidence scores for each grid cell. Face detection performance is typically evaluated using metrics like average precision (AP) and mean average precision (mAP) which measure accuracy of localization across different probability thresholds or object sizes. It has various applications including face unlock, person identification, and video surveillance.
This document provides an introduction to multiple object tracking (MOT). It discusses the goal of MOT as detecting and linking target objects across frames. It describes common MOT approaches including using boxes or masks to represent objects. The document also categorizes MOT based on factors like whether it tracks a single or multiple classes, in 2D or 3D, using a single or multiple cameras. It reviews old and new evaluation metrics for MOT and highlights state-of-the-art methods on various MOT datasets. In conclusion, it notes that while MOT research is interesting, standardized evaluation metrics and protocols still need improvement.
http://imatge-upc.github.io/telecombcn-2016-dlcv/
Deep learning technologies are at the core of the current revolution in artificial intelligence for multimedia data analysis. The convergence of big annotated data and affordable GPU hardware has allowed the training of neural networks for data analysis tasks which had been addressed until now with hand-crafted features. Architectures such as convolutional neural networks, recurrent neural networks and Q-nets for reinforcement learning have shaped a brand new scenario in signal processing. This course will cover the basic principles and applications of deep learning to computer vision problems, such as image classification, object detection or text captioning.
Abstract: Noise in an image is a serious problem In this
project, the various noise conditions are studied which are:
Additive white Gaussian noise (AWGN), Bipolar fixedvalued impulse noise, also called salt and pepper noise
(SPN), Random-valued impulse noise (RVIN), Mixed noise
(MN). Digital images are often corrupted by impulse noise
during the acquisition or transmission through
communication channels the developed filters are meant for
online and real-time applications. In this paper, the
following activities are taken up to draw the results: Study
of various impulse noise types and their effect on digital
images; Study and implementation of various efficient
nonlinear digital image filters available in the literature
and their relative performance comparison;
The document provides information about a seminar presentation on digital image processing. It discusses the following key points:
- The presentation was given by two students and covered topics like the introduction, history, functional categories, steps, necessity, filtering, technologies, advantages/disadvantages, and applications of digital image processing.
- A brief history of digital image processing is provided, noting its origins in newspaper printing and early uses in space applications and medical imaging.
- Functional categories of digital image processing include image enhancement, restoration, and information extraction. Key steps involve acquisition, enhancement, restoration, compression, and segmentation.
- Technologies discussed include pixelization, component analysis, independent component analysis, hidden Markov models,
A NOVEL METHOD FOR PERSON TRACKING BASED K-NN : COMPARISON WITH SIFT AND MEAN...sipij
Object tracking can be defined as the process of detecting an object of interest from a video scene and
keeping track of its motion, orientation, occlusion etc. in order to extract useful information. It is indeed a
challenging problem and it’s an important task. Many researchers are getting attracted in the field of
computer vision, specifically the field of object tracking in video surveillance. The main purpose of this
paper is to give to the reader information of the present state of the art object tracking, together with
presenting steps involved in Background Subtraction and their techniques. In related literature we found
three main methods of object tracking: the first method is the optical flow; the second is related to the
background subtraction, which is divided into two types presented in this paper, then the temporal
differencing and the SIFT method and the last one is the mean shift method. We present a novel approach
to background subtraction that compare a current frame with the background model that we have set
before, so we can classified each pixel of the image as a foreground or a background element, then comes
the tracking step to present our object of interest, which is a person, by his centroid. The tracking step is
divided into two different methods, the surface method and the K-NN method, both are explained in the
paper. Our proposed method is implemented and evaluated using CAVIAR database.
This document discusses motion segmentation and analysis in video surveillance. It begins by defining key concepts like optical flow, motion vectors, and how video is composed of sequences of images. It then discusses various methods for segmenting and analyzing motion in video, including background subtraction, shot boundary detection, feature detection, motion segmentation using clustering and graph-based approaches. Applications of motion segmentation mentioned include surveillance cameras, autonomous vehicles, and video compression.
A NOVEL BACKGROUND SUBTRACTION ALGORITHM FOR PERSON TRACKING BASED ON K-NN csandit
Object tracking can be defined as the process of detecting an object of interest from a video scene and keeping track of its motion, orientation, occlusion etc. in order to extract useful
information. It is indeed a challenging problem and it’s an important task. Many researchers are getting attracted in the field of computer vision, specifically the field of object tracking in video surveillance. The main purpose of this paper is to give to the reader information of the present state of the art object tracking, together with presenting steps involved in Background Subtraction and their techniques. In related literature we found three main methods of object tracking: the first method is the optical flow; the second is related to the background subtraction, which is divided into two types presented in this paper, and the last one is temporal
differencing. We present a novel approach to background subtraction that compare a current frame with the background model that we have set before, so we can classified each pixel of the image as a foreground or a background element, then comes the tracking step to present our object of interest, which is a person, by his centroid. The tracking step is divided into two different methods, the surface method and the K-NN method, both are explained in the paper.Our proposed method is implemented and evaluated using CAVIAR database.
A Novel Background Subtraction Algorithm for Person Tracking Based on K-NN cscpconf
Object tracking can be defined as the process of detecting an object of interest from a video
scene and keeping track of its motion, orientation, occlusion etc. in order to extract useful
information. It is indeed a challenging problem and it’s an important task. Many researchers
are getting attracted in the field of computer vision, specifically the field of object tracking in
video surveillance. The main purpose of this paper is to give to the reader information of the
present state of the art object tracking, together with presenting steps involved in Background
Subtraction and their techniques. In related literature we found three main methods of object
tracking: the first method is the optical flow; the second is related to the background
subtraction, which is divided into two types presented in this paper, and the last one is temporal
differencing. We present a novel approach to background subtraction that compare a current
frame with the background model that we have set before, so we can classified each pixel of the
image as a foreground or a background element, then comes the tracking step to present our
object of interest, which is a person, by his centroid. The tracking step is divided into two
different methods, the surface method and the K-NN method, both are explained in the paper.
Our proposed method is implemented and evaluated using CAVIAR database.
Digital image self-adaptive acquisition in medical x-ray imagingJie Bao
The document describes a method for digital self-adaptive image acquisition in medical x-ray imaging. It discusses x-ray fluoroscopy systems and the challenges of digital acquisition. The method uses digital subtraction to remove background signals, recognizes the valid imaging region, and analyzes the region's histogram to automatically set acquisition parameters like black level, white level, gain and offset for optimal image quality. An experiment validated that this approach improves image quality over traditional methods.
Introduction to digital image processing, image processing, digital image, analog image, formation of digital image, level of digital image processing, components of a digital image processing system, advantages of digital image processing, limitations of digital image processing, fields of digital image processing, ultrasound imaging, x-ray imaging, SEM, PET, TEM
This document discusses a technique for removing impulse noise from digital images using image fusion. It first filters a noisy input image using five different smoothing filters: median filter, vector median filter (VMF), basic vector directional filter (BVDF), switched median filter (SMF), and modified switched median filter (MSMF). The filtered images are then fused to obtain a single denoised output image with better quality than the individually filtered images. Edge detection is performed on the fused image using Canny filter to evaluate the noise cancellation performance from a human perception perspective. Experimental results show the proposed fusion technique produces better results compared to filtering with a single algorithm.
Computer vision and image processing are closely related fields that use AI techniques to extract information from visual inputs.
Image processing involves transforming images into digital form and performing operations to extract useful information. It includes steps like image acquisition, enhancement, restoration, representation, and recognition. Common applications of image processing include improving medical and satellite images.
Computer vision enables computers to interpret and understand visual inputs like images and videos. It seeks to develop techniques that help computers "see" and derive meaningful information from visual content. Key computer vision tasks include image classification, object detection, and image segmentation. Computer vision has many applications in industries like automotive, healthcare, and agriculture.
Development of Human Tracking in Video Surveillance System for Activity Anal...IOSR Journals
This document discusses the development of a human tracking system for video surveillance. It proposes a three step process: 1) detecting moving objects through background subtraction and optical flow segmentation, 2) tracking detected humans across frames while handling occlusion, and 3) analyzing activities to trigger alerts for abnormal behaviors. Previous research on human detection, tracking, and occlusion handling is also reviewed. The overall architecture is presented with each step - detection, tracking, and activity analysis - broken down in more detail.
This document describes the development of the first updatable holographic 3D display based on photorefractive polymers. The display has a size of 4x4 inches, making it the largest photorefractive 3D display to date. It is capable of recording and displaying new holographic images every few minutes that can then be viewed for several hours without refreshing. The holograms can also be completely erased and updated whenever desired. This dynamic display overcomes limitations of other holographic technologies that either allow only static images or require high refresh rates to avoid flicker during playback.
Human motion is fundamental to understanding behaviour. In spite of advancement on single image 3 Dimensional pose and estimation of shapes, current video-based state of the art methods unsuccessful to produce precise and motion of natural sequences due to inefficiency of ground-truth 3 Dimensional motion data for training. Recognition of Human action for programmed video surveillance applications is an interesting but forbidding task especially if the videos are captured in an unpleasant lighting environment. It is a Spatial-temporal feature-based correlation filter, for concurrent observation and identification of numerous human actions in a little-light environment. Estimated the presentation of a proposed filter with immense experimentation on night-time action datasets. Tentative results demonstrate the potency of the merging schemes for vigorous action recognition in a significantly low light environment.
Human Action Recognition in Videos Employing 2DPCA on 2DHOOF and Radon TransformFadwa Fouad
This document provides an overview of a Masters thesis that proposes algorithms for human action recognition. It begins with an introduction that discusses the importance of human action recognition, challenges in the field, and differences between actions and activities. It then presents an agenda that outlines an introduction, overview, and details of two proposed algorithms: 2DHOOF/2DPCA contour-based optical flow and human gesture recognition using Radon transform/2DPCA. The overview section describes the general structure of action recognition systems from video capture to classification. Experimental results on benchmark datasets demonstrate the effectiveness of the proposed algorithms.
This paper represents a survey of various methods of video surveillance system which improves the security. The aim of this paper is to review of various moving object detection technics. This paper focuses on detection of moving objects in video surveillance system. Moving body detection is first important task for any video surveillance system. Detection of moving object is a challenging task. Tracking is required in higher level applications that require the location and shape of object in every frame. In this survey,paper described about optical flow method, Background subtraction, frame differencing to detect moving object. It also described tracking method based on Morphology technique.
Keywords -- Frame separation, Pre-processing, Object detection using frame difference, Optical flow,
Temporal Differencing and background subtraction. Object tracking
Deep Learning Hardware: Past, Present, & FutureRouyun Pan
Yann LeCun gave a presentation on deep learning hardware, past, present, and future. Some key points:
- Early neural networks in the 1960s-1980s were limited by hardware and algorithms. The development of backpropagation and faster floating point hardware enabled modern deep learning.
- Convolutional neural networks achieved breakthroughs in vision tasks in the 1980s-1990s but progress slowed due to limited hardware and data.
- GPUs and large datasets like ImageNet accelerated deep learning research starting in 2012, enabling very deep convolutional networks for computer vision.
- Recent work applies deep learning to new domains like natural language processing, reinforcement learning, and graph networks.
- Future challenges include memory-aug
Performance of Various Order Statistics Filters in Impulse and Mixed Noise Re...sipij
Remote sensing images (ranges from satellite to seismic) are affected by number of noises like interference, impulse and speckle noises. Image denoising is one of the traditional problems in digital image processing, which plays vital role as a pre-processing step in number of image and video applications. Image denoising still remains a challenging research area for researchers because noise
removal introduces artifacts and causes blurring of the images. This study is done with the intension of designing a best algorithm for impulsive noise reduction in an industrial environment. A review of the typical impulsive noise reduction systems which are based on order statistics are done and particularized for the described situation. Finally, computational aspects are analyzed in terms of PSNR values and some solutions are proposed.
This document discusses image processing and summarizes several key techniques. It begins by defining image processing and describing how images are digitized and processed. It then summarizes three main categories of image processing: image enhancement, image restoration, and image compression. Specific techniques discussed include contrast stretching, density slicing, and edge enhancement. The document also discusses visual saliency models, motion saliency, and using conditional random fields for video object extraction.
The International Journal of Engineering and Science (The IJES)theijes
This document summarizes and compares different techniques for moving object detection in video surveillance systems. It discusses background subtraction, background estimation, and adaptive contrast change detection methods. It finds that while traditional methods work for single objects, correlation between frames performs better for multiple objects or poor lighting conditions, as it detects changes between frames. The document evaluates several algorithms and concludes correlation significantly improves output and performance even with multiple moving objects, making it suitable for night-time surveillance applications.
This document announces the winners of the 2024 Youth Poster Contest organized by MATFORCE. It lists the grand prize and age category winners for grades K-6, 7-12, and individual age groups from 5 years old to 18 years old.
The cherry: beauty, softness, its heart-shaped plastic has inspired artists since Antiquity. Cherries and strawberries were considered the fruits of paradise and thus represented the souls of men.
Boudoir photography, a genre that captures intimate and sensual images of individuals, has experienced significant transformation over the years, particularly in New York City (NYC). Known for its diversity and vibrant arts scene, NYC has been a hub for the evolution of various art forms, including boudoir photography. This article delves into the historical background, cultural significance, technological advancements, and the contemporary landscape of boudoir photography in NYC.
Fashionista Chic Couture Maze & Coloring Adventures is a coloring and activity book filled with many maze games and coloring activities designed to delight and engage young fashion enthusiasts. Each page offers a unique blend of fashion-themed mazes and stylish illustrations to color, inspiring creativity and problem-solving skills in children.
2. Tracking
Tracking is the problem of estimating the trajectory of
an object in the image plane as it moves around a
scene.
2 DSG, CEERI Pilani 12/8/2011
3. What is Motion Tracking…?
• Technologies that collect data on human movement
(input) used to control sounds, music, recorded or
projected text, video art, stage lighting (output) via
performer actions / gestures / movements / bio-data.
3 DSG, CEERI Pilani 12/8/2011
4. What is Motion Tracking…?
• other uses:
• Animation modeling (motion capture)
• Scientific research
(musicology, semantics, ergonomics, medicine, sports
medicine, architecture)
• Therapy for physically and mentally handicapped
4 DSG, CEERI Pilani 12/8/2011
5. Motion tracking vs. Motion capture
Motion capture Motion tracking
•Tracks location of fixed •less equipment, less data,
positions on body
•less cost ($1k-2k)
•Highly
accurate, expensive •concerned with motion
($200k-2m) qualities like
dynamic, direction of motion
•Generally not realtime
•real time
•Used for data collection
(research) and for making •used for live applications:
human or animal motion in installation
animations art, dance, theater and
(films, games, etc.) more
5 music
DSG, CEERI Pilani 12/8/2011
6. Motion capture
Motion capture is defined as "The creation of a 3D representation of
a live performance."
Tracks location of fixed positions on body with reflective markers
12-24 cameras, each lens is ringed with infrared lights
6 DSG, CEERI Pilani 12/8/2011
7. Motion capture
Motion capture is used to be considered a tool for
creating animation.
7 DSG, CEERI Pilani 12/8/2011
8. Motion capture
Typical uses
Human movement research
(sports, musicology, ergonomics, medicine,...)
Film and Animation -- often used with 3-D animation (modeling)
programs to make animations
maya (http://www.animationarena.com)
houdini (http://www.sidefx.com)
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9. Motion capture
Vicon is a leading company in motion capture
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10. Motion tracking
media output
sounds, musi
input c, text, projec
physical tions, lighting
human action
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11. Motion tracking
sensor output device
(e.g. video computer (e.g. loud media output
camera) speakers)
input sounds, musi
physical c, text, projec
human action tions, lighting
analogue to digital to
digital analogue
conversion conversion
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12. Digital vs. Analogue
Digital data
Analogue data
• easy to reproduce
• hard to reproduce
• "rich data" (infinite values) • lower resolution, less human-
• very high resolution feel.
• more details • easy to store
• contaminated data (becomes • easy to process
noisy, but rarely fails • contaminated data remains
completely) clean (errors can be filtered) or
signal fails altogether
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13. What you need to track motion
Computer needs video input
Digital video (Firewire, USB2)
+ digital cameras (camcorder, webcams)
+ low noise
+ works with laptops
- latency issues
- image resolution issues (smaller chip sizes)
- limited cable length
Analog video
+ "unlimited" cable length
+ lower latency
+ even digital cams usually have analog output
- cost more (although many older cameras work quite well)
- works less well with laptops i.e. need an external or internal
framegrabber
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14. Who is using motion tracking?
Palindrome Intermedia Performance Group
Krisztina de Chatel
Igloo
Ventura Dance (Pablo Ventura)
Robert Lepage
André Werner
Marlon Barrios Solano
La la la Human Steps
Georg Hobmeier
Leine Roebana Dans Kompanie
Troika Ranch
Blue Man Group
you
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15. The Problem in Motion Tracking
Given a set of images in time which are similar but not
identical, derive a method for identifying the motion
that has occurred (in 2d) between different images.
16. Motion Detection and Estimation
in Literature
Image differencing
based on the threshold difference of successive images
difficult to reconstruct moving areas
Background subtraction
foreground objects result by calculating the difference between
an image in the sequence and the background image
(previously obtained)
remaining task: determine the movement of these foreground
objects between successive frames
Block motion estimation
Calculates the motion vector between frames for sub-blocks of
the image
mainly used in image compression
too coarse
17. What Is Optical Flow?
Optical flow is the displacement field for each of the
pixels in an image sequence.
For every pixel, a velocity vector dx , dy
is found which says: dt dt
how quickly a pixel is moving across the
image
the direction of its movement.
20. Estimation of the optical flow
Sequences of ordered images allow the estimation
of motion as either instantaneous image velocities or
discrete image displacements.
The optical flow methods try to calculate the motion
between two image frames which are taken at times
t and
t + δt at every voxel position.
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21. Voxel Position
A voxel (volumetric pixel or Volumetric Picture
Element) is a volume element, representing a value
on a regular grid in three dimensional space.
A series of voxels in a stack with a single voxel
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22. Estimation of the optical flow
Optical Flow methods are called differential since they
are based on local Taylor series approximations of the
image signal; that is, they use partial derivatives with
respect to the spatial and temporal coordinates.
In mathematics, a Taylor series is a representation of a
function as an infinite sum of terms that are calculated
from the values of the function's derivatives at a single
point.
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23. Taylor series
The Taylor series of a real or complex function ƒ(x) that is infinitely
differentiable in a neighborhood of a real or complex number a is the
power series
which can be written in the more compact sigma notation as
where n! denotes the factorial of n and ƒ (n)(a) denotes the nth derivative of ƒ
evaluated at the point a. The zeroth derivative of ƒ is defined to be ƒ itself and (x −
a)0 and 0! are both defined to be 1. In the case that a = 0, the series is also called
a Maclaurin series.
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24. Estimation of the optical flow
For a 2D+t dimensional case (3D or n-D cases are similar) a voxel at
location (x,y,t) with intensity I(x,y,t) will have moved by δx, δy and δt
between the two image frames, and the following image constraint
equation can be given:
I(x,y,t) = I(x + δx,y + δy,t + δt)
Assuming the movement to be small, the image constraint at I(x,y,t)
with Taylor series can be developed to get:
H.O.T
(higher-order terms)
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26. Estimation of the optical flow
where Vx,Vy are the x and y components of the velocity or optical flow of
I(x,y,t) and are the derivatives of the image at (x,y,t)
in the
corresponding directions. Ix,Iy and It can be written for the derivatives in
the following.
Thus:
IxVx + IyVy = − It
or
This is an equation in two unknowns and cannot be solved as such. This is
known as the aperture problem of the optical flow algorithms. To find the
optical flow another set of equations is needed, given by some additional
constraint. All optical flow methods introduce additional conditions for
estimating the actual flow.
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27. Our Solution
Optical flow: maximum one pixel large movements
Optical flow: larger movements
Morphological filter
Contour detection (demo purposes)
28. Optical Flow: maximum one pixel large
movements
The optical flow for a pixeli, j given 2 successive
images and k : k 1
mk (i, j ) ( x, y) so that
I k (i, j) I k 1 (i x, j y) (1)
is minimum for 1 x 1, 1 y 1
k k+1
29. Optical Flow: maximum one pixel
large movements
More precision: consider a 3×3 window
around the pixel:
Optical flow for pixel i, j becomes:
mk (i, j ) ( x, y) so that
1 1 1 1
I k (i u, j v) I k 1 (i u x, j v y) (2)
u 1v 1 u 1v 1
is minimum for 1 x 1, 1 y 1
30. Optical Flow: larger movements
Reduce the size of the image
=> reduced size of the movement
Solution: multi-resolution analysis of the images
Advantages: computing efficiency, stability
31. Multi-resolution Analysis
Coarse to fine optical flow estimation:
32 32
64 64
128 128
256 256
Original image k Original image k+1
32. Optical Flow: Top-down Strategy
Algorithm (1/4 scale of resolution reduction):
Step 1: compute optical flow vectors for the highest
level of the pyramid l (smallest resolution)
Step 2: double the values of the vectors
Step 3: first approximation: optical flow vectors for the
(2i, 2j), (2i+1, 2j), (2i, 2j+1), (2i+1, 2j+1) pixels in the l-
1 level are assigned the value of the optical flow
vector for the (i,j) pixel from the l level
Level l Level l-1
33. Optical Flow: Top-down Strategy
Step 4:
adjustment of the vectors of the l-1(one) level in the
pyramid
method: detection of maximum one pixel
displacements around the initially approximated
position
Step 5:
smoothing of the optical flow field (Gaussian
filter)
34. Filtering the Size of the Detected Regions
Small isolated regions of motion detected by the
optical flow method are classified as noise and are
eliminated with the help of morphological
operations:
Step 1: Apply the opening:
Step 2: Apply the B
X closing: B
X B
X B X B B
35. Contour Detection
For demonstration purposes, the contours of the moving
regions detected are outlined
Method: the Sobel edge detector:
Compute the intensity gradient: f f
f x, y , fx, f y (5)
x y
using the Sobel masks: 1 0 1 1 2 1
1 1
Gx 2 0 2 , Gy 0 0 0 (6)
4 4
1 0 1 1 2 1
Compute the magnitude of the gradient:
M x, y f x, y fx
2
fy
2
(7)
if M x, y threshold edge pixel
then
else non-edge pixel
37. Conclusions
What we did:
We managed to estimate the motion with a certain
level of accuracy
The results might be good enough for some
applications, while other applications might require
better accuracy
What remains to be done:
Reduce computational complexity
use the computed background image to separate
foreground objects
Parallelism of the algorithms
Experiment with specific problems, calibrate the
parameters of the algorithms