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IRJET- Diabetic Haemorrhage Detection using DWT and Elliptical LBP
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1848 Diabetic Haemorrhage Detection using DWT and Elliptical LBP Rabul Saikia1, Manish Shankar Kaushik2, Dr. Aditya Bihar Kandali3 1Department of Electrical Engineering, Jorhat Engineering College, Jorhat, Assam, India 2Department of Electrical Engineering, Jorhat Engineering College, Jorhat, Assam, India 3Associate Professor, Dept. of Electrical Engineering, Jorhat Engineering College, Jorhat, Assam, India -----------------------------------------------------------------------***-------------------------------------------------------------------- Abstract - The extraction of exact retinal haemorrhage of diabetic patient plays a significant role in medical image processing. This paper presents an accession for detection of both haemorrhage and healthy retina using symmetric Elliptical Local Binary Pattern (ELBP) and Discrete Wavelet Transform (DWT). The features of both haemorrhage and healthy retinal images are extracted using ELBP and further features are reduced by DWT. For classification binary SVM classifier is used here. The approach implemented on HRF database signifies 92.3% rate of accuracy. Key Words: DWT, Elliptical Local Binary Pattern, SVM, Diabetic haemorrhage 1. INTRODUCTION Diabetic retinopathy is one of the paramount topics in the field of medical research. In recent times,automatic tracking down of haemorrhages in diabetic retinal images has become immensely important in the clinical milieu. Indeed, diabetic retinopathy is a disease that deteriorates the retina and can lead to blindness. Haemorrhages in the retina are one of the primeval symptoms of diabetic retinopathy. An early and accurate diagnosis of diabetic retinopathyhelps to improve medical treatment and prognosis. To abetment ophthalmologistsnumerouscomputer-sustaininterpretation setup have been proposedin identifyingdiabetic retinopathy by detecting exudates, micro-aneurysms, or hemorrhages in the retina. In Ref. [1], the authors contemplated an automated methodology by extracting fovea, retinal tissue and optic disc in order to segment dark spot lesions. Then, those segmented spots are classified into micro-aneurysms and hemorrhages. In Ref. [2], the authors contemplated three stage automated methodology to detect exudates and macula. Exudates derivation is conceivably imitate in first lap by a distinct number of features. Macula is identified in second lap by a GMM (Gaussian mixtures model) classifier trained with accomplish features. Lastly, to categorized diabetic macular edema the macular conform and section of exudates are assigned. In Ref. [3], the authors conferred a methodologyhingeonby extracting regions of interest and normalizing local-maxima scale for micro-aneurysm revelation. For portraying goals Hessian response are assigned across different scales. Finally, to disclose regions with true micro-aneurysm four classifiers: Naïve Bayes, Support Vector Machines (SVM) random forest andK-Nearest Neighbor(K-NN)areemployed with scale-space features. In Ref. [4], a three- stepsetup was conferred for revelation of micro-aneurysms by proving filter banks. Firstly whole expedient applicant portion are tabbed for micro-aneurysms. Then, a sort of features is enumerating for each division in the second stage. Finally, a GMM (Gaussian mixture model) and SVM (Support Vector Machine) are combined to perform classification. Moreover in Ref. [5], the authors conferred a methodology for revealing of micro-aneurysms by proving a sparse representation and dictionary learning. In their effort, vicinity with presumed micro-aneurysmsisdistinguishedby proving multi-scale Gaussian correlation filter. At the end most steps Support VectorMachine(SVM)isbeing employed for training as well as classification. 2. PROPOSED METHODOLOGY Our proposed methodology mainly comprises of Pre- processing, Feature extraction, Feature reduction and Classification. The overall block diagram of our proposed method as follows: Figure 1: Block Diagram of Proposed Methodology 2.1 PRE-PROCESSING Retinal image can be represented by combination of small- scale (high frequency) and large scale (low frequency) features. Illumination variations deeply affect on a large scale i.e. low frequency features. So it is an important step to correct the illumination affects of the retinal images before extracting their features. In our approach we apply mean or averaging filter of mask 5×5 to correct the illumination.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1849 2.2 ELLIPTICAL LOCAL BINARY PATTERN ELBP [7] is just a modified version of general Local Binary pattern(LBP). The original LBP [8] imported by Ojala et al. to form the labels of an image by thresholding 3x3 neighborhood each pixels with the center pixel value. In ELBP scheme ellipse is considered rather than circle. ELBP code is computed by comparing its value with surrounding which are located on an ellipse and the center of the ellipseis current pixel itself. If R1 and R2 are horizontal and vertical radius of the ellipse then ELBP level for one pixel (xc,yc) surrounding with K neighboring pixel is: Where gc and gi are the gray scale value of current and the ith neighboring pixels. The binary encoding function S(x) is defined as follows: If R1 > R2 then it is horizontal ELBP (hELBP) and if R2 > R1 then it is vertical ELBP (vELBP). In our work we have considered both 3 × 5 horizontal and 5 × 3 vertical ELBP to get 5×5 symmetric ELBP mask for feature extraction. The symmetric ELBP pair is as follows: Figure 2: 5x5 Symmetric ELBP Pair We applied symmetric ELBP mask of 5×5 on entire illumination corrected retinal image to derive the micro features. 2.3 DISCRETE WAVELET TRANSFORM DWT [6] is a discretely sampledwavelettransformcapableof capture both frequency and time domain information. DWT decompose the signal into different bands or frequency. The involve filters of DWT are known as ‘wavelet filter’ and ‘scaling filter’. The wavelet filter is high pass filter and other is low pass filter.DWTperformsondifferentmotherwavelets such as Haar wavelet, Daubechies, Morlet and others. In image processing 2D-DWT is employed which perform operation throughout the rows of original image by employing both low pass filter (LPF) and high pass filter (HPF) simultaneously. Then down sampled by factor 2 and achieved detailed part (high frequency) and approximation part (low frequency). Further operation is performed throughout the columns of image. At every level four sub images are achieved. Among them one is approximate image (LL) and other three are vertical (LH), horizontal (HL) and diagonal detail (HH). In our work we computed 1st level 2D-DWT on ELBP extracted features to decompose it into four sub bands. Among them we took approximate (LL) band of the features and other three were discarded. We considered ‘Haar’ wavelet as mother wavelet in our approach. 2.4 SUPPORT VECTOR MACHINE Support Vector Machine [9] finds wide applications in the field ofpatternrecognitions.Inseparatingthevariousclasses, the SVM achieves a separation level which is near optimum. In our study, by using the extractedfeatureswetraintheSVM to perform the classification of the facial expression. The SVM, in general, separates the high-dimensional space by building a hyperplane. As the distance between the training data of any of the classes and the hyper plane is the largest, it is termed as the ideal separation. Given labelled samples of a training set: The SVM tries to acquire a hyper plane that distinguishes the samples having the smallest errors. For xi an input vector,theclassificationprocessisachievedby evaluating the distance from xi, the input vector to the hyper plane. The actual SVM is a binary classifier. However, for performing the multi-class classification, here we take the one-against-rest strategy. 3. RESULTS AND DISCUSSION For appraising our proposed system, we made utilization of High-Resolution Fundus (HRF) database [10]. The database comprises images of 15 fit patients, 15 diabetic haemorrhages patients and 15 glaucomatous patients. The images here are resized to 300×200. When theinputimageis fed, at first, we apply the 5×5 mean filter. Subsequently the techniques of the proposedmethod are applied foracquiring the features. We selected randomly both healthy and haemorrhage retina images to createtrainingandtestingset. Finally training and testing set consist of 23 and 13 images respectively. Figure 3: Accuracy Plot of HRF database
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 02 | Feb 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1850 The confusion matrix plot of HRF database is shown in Figure 3, hereby we have achieved 92.3 rate of accuracy. 4. CONCLUSION We propose an effective method in this paper to handle the problem of retinopathy for exact detection of haemorrhage retina in different lighting conditions (illumination variation). Human eyess are elliptical in nature hence we have applied a texture based elliptical LBP pair on retinal image to derive more exact micro components of retina. Moreover DWT was also computed to reduce feature without losing important information and reduce computation time. The features are then classified by using SVM classifier. Experimental results on the HRF database signifies that the contemplated methodology achieves a significantly better accuracy rate being 92.3%. The task of detection of the haemorrhage retina is very exacting. More efforts to improve the detection rate are to be required for vital applications. Our future work objectiveisimprovingthe performance accuracy of the method in the wild and also in the blur retinal images. REFERENCES [1] M.D. Saleh, C. Eswaran, An automated decision-support system for nonproliferative diabetic retinopathydisease based on MAs and HAs detection, Comput. Methods Prog. Biomed. 108 (2012) 186–196. [2] M.U. Akram, A. Tariq, S.A. Khan, M.Y. Javed, Automated detection of exudates and macula for gradingofdiabetic macular edema, Comput. Methods Prog. Biomed. 114 (2014) 141–152. [3] K.M. Adal, D. Sidibé, S. Ali, E. Chaum, T.P. Karnowski, F. Mériaudeau, Automated detection of microaneurysms using scale-adapted blob analysis and semi-supervised learning, Comput. Methods Prog.Biomed.114(2014)1– 10. [4] M.U. Akram, S. Khalid, S.A. Khan, Identification and classification of microaneurysms for early detection of diabetic retinopathy, Pattern Recogn. 46 (2013) 107– 116. [5] B. Zhang, F. Karray, Q. Li, L. Zhang, Sparse representation classifier for microaneurysm detection and retinal blood vessel extraction, Inform. Sci. 200 (2012) 78–90. [6] Saikia, Rabul, and Aditya Bihar Kandali. "DWT-ELBP based model for face recognition." In2017International Conference on Energy, Communication, Data Analytics and Soft Computing (ICECDS), pp. 1348-1352. IEEE, 2017. [7] Nguyen, Huu-Tuan, and Alice Caplier. "Local patterns of gradients for face recognition." IEEE Transactions on Information Forensics and Security 10, no. 8 (2015): 1739-1751. [8] Mäenpää, T., Timo Ojala, M. Pietikäinen, and Maricor Soriano. "Robust texture classification by subsets of local binary patterns." In Proceedings of the 15th International Conference on Pattern Recognition, vol. 3, no. 3-7, pp. 939-942. 2000. [9] Hsu, Chih-Wei, Chih-Chung Chang, and Chih-Jen Lin. "A practical guide to support vector classification." (2003): 1-16. [10] Odstrcilik, Jan, Radim Kolar, Attila Budai, Joachim Hornegger, Jiri Jan, Jiri Gazarek, Tomas Kubena, Pavel Cernosek, Ondrej Svoboda, and Elli Angelopoulou. "Retinal vessel segmentation by improved matched filtering: evaluation on a new high-resolution fundus image database." IET Image Processing 7, no. 4 (2013): 373-383. BIOGRAPHIES Rabul Saikia Research Scholar, Department of Electrical Engineering, Jorhat Engineering College, Jorhat Research area includes: Digital Image processing, Medical Imaging, Computer Vision Application, Face Recognition, Facial Expression Recognition Manish Shankar Kaushik Research Scholar, Department of Electrical Engineering, Jorhat Engineering College, Jorhat Research area includes: Digital ImageProcessing,ImageForensics, Computer Vision Application, Face Recognition, Facial Expression Recognition. Dr. Aditya Bihar Kandali Associate Professor, Dept. of Electrical Engineering, Jorhat Engineering College, Jorhat Research area includes: Speech Processing, Digital Image Processing, Computer Vision, Artificial Intelligence, Neural Network, Machine Learning
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