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IRJET- Diabetic Retinopathy Stage Classification using CNN
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5969 Diabetic Retinopathy Stage Classification using CNN Nikhil M N1, Angel Rose A2 1PG Scholar, Department of Computer Application, College of Engineering, Trivandrum, Kerala, India Assistant Professor, Department of Computer Application, College of Engineering, Trivandrum, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - For the evaluation and treatment of Diabetic Retinopathy (DR), stage classification is a crucial step. Microstructures like micro-anuerysms, hard exudates, and neovascularization may occupy in the retinal area due to the damage of blood vessels. A CNN, Convolutional Neural Network, based approach can be used to automate the method of DR stage classification. In this work, from the color fundus retinal images, DR is classified into five stages using a CNN. Images with diabetic retinopathy are classified into five groups from the opinion of an expert of ophthalmologists. Three Convolutional Neural Networks are deployed for stage classification of DR. By the concatenation of these three networks, VGG16, AlexNet, and InceptionNet V3, an accuracy of 80.1% is obtained. Key Words: diabetic retinopathy, image classification, deep convolutional neural network, AlexNet, Vgg16, InceptionNet V3 1. INTRODUCTION Diabetic retinopathy (DR) is a diabetes complication that affects eyes. Damages in the blood vessels of the light- sensitive tissue at the retina make DR. Diabetic retinopathy is one of the causes for the blindness among working-age adults. Approximately four hundred and twenty million people worldwide have been diagnosed with diabetes mellitus. The universality of this disease has doubled in the past 20 years especially in Asia. Approximately one-third are expected to be diagnosed with DR, a chronic eye disease that can cause vision loss. For correct treatment and to prevent visual loss, DR stage classification based on the extremity is very important. Based on the Study of the Early Treatment Diabetic Retinopathy, DR can be classified into five stages. The first stage is the Normal stage, second Mild NPDR (NPDR stands for None-Proliferative Diabetic Retinopathy), the third stage is Moderate NPDR, the fourth stage is Severe NPDR, and the fifth stage is PDR (Proliferative Diabetic Retinopathy). Fig- 1 shows five stages of DR. (a) in Fig-1, represents a stage 1 retinal image, that is, Normal, (b) represents a stage 2 image, that is, Mild-NPDR;(c) represents stage 3 DR, (d) represents stage IV, that is, Severe NDR; (e) shows the retinal image of stage V, that is, PDR. Fig -1: Five different stages of Diabetic Retinopathy Many microaneurysms are present on the right side of the image, in Fig-1(b). In fig-1(c), a number of hard exudates and micro-aneurysms are present on the right side of the fundoscopic image. In fig-1(d), many intra- retinal hemorrhages are present and can see a number of intra-retinal microvascular abnormalities. In figure 1(e), pre-retinal hemorrhage and neovascularization can be seen indicating the PDR. Table -1: DR stages and severity DR Stage Severity Normal No abnormalities Mild NPDR Lesions of micro-aneurysms, small areas of balloon- like swelling in the retinas blood vessels. Moderate NPDR Swelling and distortion of blood vessels. Severe NPDR Many blood vessels are blocked, which causes abnormal growth factor secretion. PDR Growth factors induce proliferation of new blood vessels inside the surface of the retina, the new vessels are fragile and may leak or bleed, scar tissue from these can cause retinal detachment. The National Eye Institute provides a standardized description of the severity class of DR patients, shown in Table 1, which are the classes that our classifier predicts. There are five severity scales.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5970 1.1 Related Works Many classifiers were designed to classify DR. Most of them are binary classifiers, that is it classify data only into two classes: normal, and DR affected [4][5][3]. In [4][3] describes the use of image processing and deep learning methods to diagnose diabetic retinopathy from retinal fundus images. In [4], for the retinal fundus images enhancement approach V transform algorithm and histogram equalization techniques were used and a Gaussian low-pass filter was applied to the retinal fundus image. The classification was made using the Convolutional Neural Network. In that experiment [4], the accuracy was 96.67%. Work in [5] focuses on developing a mobile application for real-time screening of diabetic retinopathy. It was created using a tensorflow architecture. The convolutional neural network model used in [5] was MobileNets, which are designed for mobile devices. It consists of 28 convolutional layers. A label, diabetic retinopathy or no diabetic retinopathy, is the output. The model obtained an accuracy of 73.3%. This model was specially designed for mobile devices. [2] designs a classifier to predict the DR stage from fluorescein angiography photographs using state-of-the-art convolutional neural networks (CNNs). Fluorescein angiography photographs represent the blood flow in the retina. The photographs are able to show abnormal blood vessels or damage in the retina. Fluorescein angiography photographs are black and white photographs. [1] design a classifier using three state-of-the-art convolutional neural networks (CNNs) separately and measure the accuracy of each network. It shows that InceptionNet has achieved the highest accuracy of 63.23%. 1.2 Our System In our system, we design three state-of-the-art CNNs and concatenate their features to develop a system that classifies different stages of DR from the color fundoscopic images. The classification is done based on the severity of five DR stages. For this classification, deep learning based CNN networks is deployed. From the past, many medical studies were conducted on the field of designing a algorithm to classify DR from a retinal fundus image [1][4]. But they were just binary classifiers which only differentiate two stages of DR including Normal and DR affected. Two previous works, that also tries to build a DR classifier using CNN is in [1] and [2]. But, the results obtained in [1] and [2] have a lower prediction accuracy, when relating to this work. In this work, we check the prediction accuracy of different deep convolutional neural network architectures and the combination of these networks when they are deployed as a DR stage classifier. The study was done based on the Kaggle dataset which contains 500 images of retinas. We found that after concatenating VGG16, AlexNet, and InceptionNet V3, the classifier provides the highest accuracy of 80.1%. 2. PRELIMINARY KNOWLEDGE Convolutional Neural Networks (CNN) is an architecture of Artificial Neural Networks (ANN) mostly used for image classification. CNN adds some more operations to regular Neural Networks like convolution, nonlinearity, and sub-sampling. CNNs mainly has two parts: the first one is the feature extraction part and the second one is the classification part. In the first part, a series of convolution and pooling operations are performed for feature detection. For producing a feature map, using a filter, the convolution operation is applied. This feature map will contain negative pixel values and it should be replaced with zero. For that, a non-linear operation is performed after performing every convolution. Nonlinearity is introduced using Rectified Linear Unit(ReLU). In the classification part, on top of these extracted features fully connected layers will act as classifiers. They assign a probability for the object on the image. When these images are too large, the pooling operation continuously reduces the dimensionality. This is done for reducing the number of computations and parameters in the network. This reduces training time and controls overfitting. Spatial pooling also called subsampling or downsampling which retains the most important information. Spatial pooling is mainly in three types: Max pooling, Average pooling, and Sum pooling. The largest element from the rectified feature map is taken in max pooling. In sum pooling, the sum of all elements in the feature map is taken. It is also possible to add as many convolutional layers. The basic architecture of CNN [16] is shown in fig-2. In this paper, we use three CNN architecture, VGG16, AlexNet, and InceptionNet V3 for the accurate stage classification of DR. Before going to the configuration setup of these layers let's see the architecture of this three networks.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5971 Fig- 2: Architecture of CNN 2.1 AlexNet AlexNet contains three fully connected layers following five convolutional layers, as shown in Fig-3 Fig- 3: Architecture of AlexNet The earlier standard in traditional neural networks for the non-linear part was a Tanh or Sigmoid function. In AlexNet, it uses ReLu(Rectified Linear Unit) for the non-linear part. ReLu value is calculated by, f(x) = max(0,x) In saturating areas, derivative of sigmoid function will become too small. So the updates to the weights almost disappear. But in ReLu, it trains much faster than the latter. In AlexNet, after every convolutional Fully-Connected layers(FC), ReLu layer is placed. By placing a Dropout layer after each FC layer, this network reduces the over-fitting problem. 2.2 VGG16 By placing multiple 3x3 kernel-sized filters, VGG16 replaces large kernel-sized filters in AlexNet. It is better to use multiple stacked smaller size kernel rather than one with a larger kernel size for enabling the model to learn features, which are complex, at low cost. Because multiple non-linear layers will increase the depth of the network. The VGG16 layers have 3 fully connected layers. The network width starts with a value of 64 and increases the value by 2 after every pooling layer. VGG16 architecture is shown in fig- 4. Fig -4: Architecture of VGG16 2.3 InceptionNet V3 The inception module on GoogLeNet is similar to normal CNN with dense construction, and a small number of neurons are effective. As mentioned earlier, the number of filters with a particular size is small. Different sized convolutions are used for capturing details at various scales. The architecture of the Inception module of GoogLeNet is shown in fig- 5.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5972 Fig-4: Architecture of InceptionNet V3 3. PROPOSED METHODOLOGY Pipeline architecture of proposed system is shown in Figure 6. Fig -6: Proposed Methodology 3.1 Data Acquisition Data were drawn from a dataset provided via Kaggle. The dataset used is highly heterogeneous because the photographs are from different sources, cameras, resolutions, and have different degrees of noise and lighting [7]. These images have resolutions ranged from 2592 x 1944 to 4752 x 3168 pixels. So some preprocessing steps have proceeded. After these preprocessing, a total of 500 images were selected from dataset of Kaggle. From these 500 images, 70% of the images are used for training purpose and remaining is used for testing the system. The decomposition of these 500 images are in Table 2. Table-2: Composition of Dataset 3.2 Hyper Parameter Initialization Before designing the network layers, we initialized the hyperplane values. We set the momentum value, θ, to 0.9, initial learning values(α), mini-batch size, learning-rate decay-schedule, and learning rate factor. The alpha values are initialized to 0.0001, 0.0001, and 0.001 for AlexNet, VGG16, and InceptionNet respectively. Learning-rate- decay schedule was stairwise for both AlexNet and VGG16, and InceptionNet has an exponential decay schedule. The learning-rate-decay factor was 0.10 for AlexNet and VGG16, and for InceptionNet it was 0.16. The learning rate decay factor was initially 20 for both AlexNet and VGG16 and 32 for InceptionNet. 3.3 Pre- Processing To achieve high accuracy, we proceeded some preprocessing steps as follows: CNN workes in dataset of fundus images and the images came in varying sizes and aspect ratios. One primary step involved in preprocessing is resizing the images and downsizing all images to 256 x 256 images. Before giving data into the architecture for classification, convert the images into the green channel image. And then, apply filters for salt and pepper noise removal. Data are monochrome images that highlight the microaneurysms(MA), and vessels in the fundus images. The microaneurysms(MA) are swelling, in the side of a blood vessels. MAs are found in the retina of people with diabetes. MA is an important sign of DR. MA candidates have the highest contrast in a fundus image. Contrast adjustment was performed using the histogram equalization filtering algorithm 3.4 Training Algorithm For the training of the three state-of-the-art models, Stochastic Gradient Descent with Momentum (SGDM) optimization algorithm is used. It accelerates the global Stage No. of Images No DR 100 Mild DR 100 Moderate NPDR 100 SNPDR 100 PDR 100
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5973 minimum of the cost function in right direction and smoothes out oscillations in volatile directions, for faster converging[3]. It adds momentum to the classic SGD algorithm. The parameter θ follows an exponentially weighted moving. The updated rule for average of the gradients of the cost function is Here β is Momentum Parameter, t is the iteration count, and α is the learning rate. Momentum parameter, β, takes a value between zero and one, and it approximates the moving window where the weighted average is calculated. β = 0.90 is the good and default value. For the successful training of three CNN networks, we use fine tuning with respect to the pretrained model from ImageNet [3]. Fine-tuning procedure is based on the concept of transfer learning. Here we train a CNN to learn features for a broad domain with a classification function that is targeted to minimize error in that particular domain. After that, we replace the classification function and optimize the network again to minimize error in another domain. Here we are transferring the features and the parameters of a network from broad domain to the specific one. And ImageNet is a database of images built upon the backbone of the WordNet structure [3]. For the effective completion of fine-tuning, the input images to all the networks were resized. 4. RESULTS AND CONCLUSION After designing the three networks separately, features from the three networks are concatenated for better performance. The system was tested using single images The trained models of all the networks are loaded for single image testing. The graph of training the networks are shown below To evaluate the performance of our CNN classifier, we adopted the accuracy measure. The accuracy was calculated using the following equation, Accuracy = Number of accurate Prediction / Total number of Predictions The accuracy obtained by individual networks and the accuracy after feature concatenations are shown in Table 3. Table – 3: Results ACKNOWLEDGEMENT We are gratified to the Department of Computer Application, College of Engineering, Trivandrum and each & everyone who helped us in carrying out this research work. REFERENCES [1] Xiaoliang Wang ; Yongjin Lu ; Yujuan Wang ; Wei-Bang Chen,”Diabetic Retinopathy Stage Classification Using Convolutional Neural Networks”, 2018 IEEE International Conference on Information Reuse and Integration (IRI),Year: 2018M. Young, The Technical Writer’s Handbook. Mill Valley, CA: University Science, 1989. [2] M. Alban and T. Gilligan, “Automated detection of diabetic retinopathy using fluorescein angiography photographs,” Stanford Technical Report, 2016. [3] Ning Qian,” On the momentum term in gradient descent learning algorithms”, Center for Neurobiology and Behavior, Columbia University, 722 W. 168th Street, New York, NY 10032, USA. [4] Ömer Deperlioğlu ; Utku Köse,”Diagnosis of Diabetic Retinopathy Using Image Processing and Convolutional Neural Network”, 2018 Medical Technologies National Congress (TIPTEKNO) Year: 2018. [5] Shorav Suriyal ; Christopher Druzgalski ; Kumar Gautam, “Mobile assisted diabetic retinopathy detection using deep neural network”, 2018 Global Medical Engineering Physics Exchanges/Pan American Health Care Exchanges (GMEPE/PAHCE) Year: 2018 [6] J. Deng, W. Dong, R. Socher, L. J. Li, K. Li, and L. Fei-Fei, “ImageNet: A large-scale hierarchical image database,” in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2009), IEEE, Jun. 2009, pp. 248-255. [7] Diabetic retinopathy detection: identify signs of diabetic retinopathy in eye images, https://www.kaggle.com/c/diabetic-retinopathy-dete ction Training Algorithm Accuracy AlexNet 46.2% VGG16 52.2% InceptionNet V3 65.23% After feature concatenation 80.1%
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5974 [8] V. Gulshan, L. Peng, M. Coram, M. C. Stumpe, D. Wu, A. Narayanaswamy, S. Venugopalan, K. Widner, T. Madams, J. Cuadros, R. Kim, R. Raman, P. C. Nelson, J. L. Mega, and D. R. Webster, “Development and validation of a deep learning algorithm for detection of diabetic retinopathy in retinal fundus photographs,” The Journal of the American Medical Association, vol. 316, issue 22, Dec. 2016,pp.2402-2410.
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