| 2 | A Convolutional Neural Network Classifier VGG-19 Architecture for Lesion Detection and Grading in Diabetic Retinopathy Based on Deep Learning显示文摘Diabetic Retinopathy(DR)is a type of disease in eyes as a result of a diabetic condition that ends up damaging the retina,leading to blindness or loss of vision.Morphological and physiological retinal variations involving slowdown of blood flow in the retina,elevation of leukocyte cohesion,basement membrane dystrophy,and decline of pericyte cells,develop.As DR in its initial stage has no symptoms,early detection and automated diagnosis can prevent further visual damage.In this research,using a Deep Neural Network(DNN),segmentation methods are proposed to detect the retinal defects such as exudates,hemorrhages,microaneurysms from digital fundus images and then the conditions are classified accurately to identify the grades as mild,moderate,severe,no PDR,PDR in DR.Initially,saliency detection is applied on color images to detect maximum salient foreground objects from the background.Next,structure tensor is applied powerfully to enhance the local patterns of edge elements and intensity changes that occur on edges of the object.Finally,active contours approximation is performed using gradient descent to segment the lesions from the images.Afterwards,the output images from the proposed segmentation process are subjected to evaluate the ratio between the total contour area and the total true contour arc length to label the classes as mild,moderate,severe,No PDR and PDR.Based on the computed ratio obtained from segmented images,the severity levels were identified.Meanwhile,statistical parameters like the mean and the standard deviation of pixel intensities,mean of hue,saturation and deviation clustering,are estimated through K-means,which are computed as features from the output images of the proposed segmentation process.Using these derived feature sets as input to the classifier,the classification of DR was performed.Finally,a VGG-19 deep neural network was trained and tested using the derived feature sets from the KAGGLE fundus image dataset containing 35,126 images in total.The VGG-19 is trained with features extracted from 20,000 images and tested with features extracted from 5,000 images to achieve a sensitivity of 82%and an accuracy of 96%.The proposed system was able to label and classify DR grades automatically. | V.Sudha T.R.Ganeshbabu | 2021 | Computers, Materials & Continua2021，，1： | 0 |
| 3 | Comparison of Detection and Classification of Hard Exudates Using Artificial Neural System vs.SVM Radial Basis Function in Diabetic Retinopathy显示文摘Diabetic Retinopathy(DR)is a disease that occurs in the eye which results in blindness as it passes to proliferative stage.Diabetes can significantly result in symptoms like blurring of vision,kidney failure,nervous damage.Hence it has become necessary to identify retinal damage that occurs in diabetic eye due to raised glucose level in its initial stage itself.Hence automated detection of anamoly has become very essential.The appearance of crimson and yellow lesions is considered as the earliest symptoms of DR which are called as hemorrhages and exudates.If DR is analysed at initial stage,blindness does not occur.The damage in retina can hinder the light that passes through nerves of the eye leading to visual loss.The motivation behind this research is to reduce the number of false positives by accurate detection which is possible using proposed fuzzy system based on ANN.Though several classifiers are available to detect the exudates this paper makes analysis of support vector machine using radial basis kernel function with proposed ANN technique.Also,adaptive neuro fuzzy inference system segmentation is performed after feature extraction technique,which makes classifer to outperform.The evaluation results showed that proposed artificial neural network based on fuzzy approach attained significant results compared to other classifiers.Moreover,the proposed algorithm has significant accuracy of 94%and minimum error rate has been observed. | V.Sudha T.R.Ganesh Babu N.Vikram R.Raja | 2021 | Molecular & Cellular Biomechanics2021，18，3： | 0 |
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