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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 591 FPGA Implementation of Glaucoma Detection Using Neural Networks Hitesh Shirke1, Dr. Nataraj Vijapur2 1 IV Semester M.Tech. Student, Dept. of Electronics and Communication Engineering. K.L.E. Dr. M.S.Sheshgiri College of Engineering and Technology, Belagum-590008 Karnataka, India-590018 2Faculty Dept. of Electronics and Communication Engineering. K.L.E. Dr. M.S.Sheshgiri College of Engineering and Technology, Belagum-590008 Karnataka, India-590018 ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Glaucoma is an eye disease that occurs because of the increased IntraOcular Pressure(IOP) which results in damaged optic nerve. Because of glaucoma the optic cup size gets increased and the optic cup to optic disk ratio(CDR) increases. This paper proposes glaucoma disease detection from retinal images using artificial neural network as the classifier. Optic cup area, opticdiskareaandneuro-retinal rim area are the features that are used for the classification. FPGA implementation of neural networkoffersboththeadaptability in reconfiguration and parallel architectureof neurons. Hence FPGA is better choice for the neuralnetworksinsteadofDSP or ASIC implementation. The feed forward back propagation algorithm is used for the neural network. Matlab R2015a software is used to extract the features and the neural network is implemented on Spartan 3a FPGA kit. Key Words: Glaucoma, Cup to disk ratio, Neuroretinal rim, Artificial neural network, FPGA implementation 1. INTRODUCTION The human eye is the most important part of the human body. Therefore detection of human eye diseases is always needed. Diseases like glaucoma, cataract, macular degeneration, diabetic retinopathy affect the patient’s eye. Glaucoma is a very silent disease of the eye. The scary part about this disease is that it is so silent that it normally doesn’t announce itself. It’s a disease which affects the optic nerve of the eye. It causes thinning up and drying up of the optic nerve. This results in visual loss which can be irreversible. Glaucoma can happeninanyoneacrossthepopulationwhich means any person and age. The easiest way to prevent glaucoma is to get it diagnosed in the very early stages. There is no prevention of glaucoma if you are the person who is going to have glaucoma in your lifetime. Glaucoma is best treated medically using eye drops or using tablets to reduce the pressure inside the eye. This work aims to detect glaucoma using FPGA hardware. The artificial neural network is used as a classifier to detect glaucoma. 1.1 Glaucoma Measurably just about 45 million individuals worldwide have glaucoma and around 79 million individuals are expected to suffer from glaucoma by the year 2020. The optic nerve is in charge of conveying the data seen by eye to the brain. If there should be an occurrence of Glaucoma, optic nerve is harmed and the data got by the brain gets debased henceforth the vision loss. The essential reason behind this harm of the optic nerve is increased IntraOcular Pressure(IOP). Keeping in mind the end goal to keep up a steady eye pressure,human eyeceaselesslydeliversaqueous humor, a liquid which moreover continually streams out of the eye. In the event of glaucoma, there is an increase in liquid pressure of the eye on the grounds that the aqueous humor does not stream out of the eye as it ought to be which at last results in damage to the optic nerve fiber. This optic nerve harm can be recognized by Optical Coherence Tomography (OCT) and Heidelberg Retina Tomography (HRT). The cost of glaucoma identification utilizing OCT and HRT is high. Colour Fundus Image (CFI) technique has been broadly used to analyze glaucoma and other visual sicknesses. 1.2 Glaucoma Effects Fig-1: normal fundus image
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 592 Fig-1. shows the fundus image of a normal eye taken from a fundus camera. The bigger circular area istheoptic disk area and the smaller circular area within the optic disk is the optic cup area. The difference between theoptic disk andthe optic cup area is called the Neuro-Retinal Rim(NRR). Fig-2: (A) Healthy optic disk (B) Unhealthy optic disk The glaucoma disease can be determined by observing the changes in the optic disk area. As you can see in fig-2. (A) indicates the healthy eye in which the optic cup size is very small as compared to the optic disk. But because of glaucoma the optic cup size gets increasedandtheopticcup to optic disk ratio(CDR) increases this is shown in fig-2.(B). 2. METHODOLOGY Methodology of proposed glaucoma detection system is shown in above fig-3. Input fundus image is initially pre- processed for noise removal. The pre-processed image is subjected to feature extraction. The features such as optic disk area, cup area and neuro retinal rim (NRR) area are extracted. Then the next stage involves classification using neural networks 2.1 Fundus Retinal Images To determine the performance of the proposed method, we have used 30 fundus images from HRF image database, containing 15 healthy and 15 glaucoma images. The images are in jpeg format with resolution of 3504×2336 pixels. An input fundus image is shown in below fig-4. Fig-3: Methodology of the proposed system Fig-4: input fundus image 2.2 Image Pre-processing Goal of the pre-processing is to enhance the picture by improving certain elements and/or by removing unwanted noise. The input images are of high resolution 3504×2336 pixels. Processing such high resolution images can take a lot of processing time hence wehaveresizedtheinputimagesto 875×563 pixels. The image is then converted to HSV colour map (Hue, Saturation,Value) byusingrgb2hsv(N)command. To highlight the optic disk the red colour is removed from the image and unwanted pixels are removed. It is important to mark the region of interest (ROI) to reduce the processing time also to initially mark the temporary boundary of the optic disk. ROI is defined by approximately marking the centre of ROI and drawing a rectanglearoundit. Then the region of interest is cropped from the original image. The pre-processing steps are shown in below fig-5. Fig-5: image pre-processing
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 593 2.3 Feature extraction 2.3.1 Optic Disk Extraction Feature extraction from the pre-processed image is done using the segmentation technique calledmulti-thresholding. This technique is similar to thresholding technique. This technique is based on partitioning animageintoregionsthat are similar according to the thresholding values. The main part of this technique is to determine the threshold value. For example, the threshold value will be between 0 and 255 for an 8 bit resolution image. After determining the threshold values for all regions, every pixel in that region is assigned a fix value. For example, if there are two regions then the pixels belonging to a region can be assigned with a value 1 and the remaining pixels with value 0. When we establish more than one threshold values in the sameimage, the technique is called multi-thresholding. Here higher and lower limits are set for each region.Thusinordertosegment the optic disk we have set the threshold value as shown below; Idisk(x,y) = {255 if a(x,y) > TD = { 0 otherwise Where TD is the threshold value for optic disk extraction. Fig-6: optic disk extraction First histogram equalization technique is used to enhance the ROI image. Histogram equalization technique is used for adjusting the image intensities so that its contrast can be enhanced. After that thresholding is applied to extract the optic disk as shown in above fig 6. 2.3.2 Optic Cup Extraction The optic cup extraction is similar to the optic disk extraction, by applying thresholding technique to the ROI image. In order to segment the optic cup we have set the threshold value TC higher than TD since the opticcuparea is more brighter than the optic disk area as shown below; Icup(x,y) = {255 if a(x,y) > Tc = { 0 otherwise Where TC is the threshold value for optic cup extraction. Fig-7: optic cup extraction 2.3.3 Neuro Retinal Rim Extraction The neuro retinal rim area are is area between the optic cup area and the optic disk area. Hence it can be found by subtracting the cup area from the disk area. Fig-8: NRR extraction Finally optic cup to disk ratio(CDR) and neuro retinal rim area is calculated as follows. Cup to disk ratio = [cup area] / [disk area] Neuro retinal rim area = [optic disk area – optic cup area] 2.4 Artificial neural networks Neural networks can be actualized utilizing analog or digital systems. digital implementation is more prevalent as it has the benefit of higher precision, better repeatability, lower noise sensitivity, better testability, higher adaptability,also, compatibility with different sorts of preprocessors. The digital neural network hardware implementation can be classified as (i) FPGA-implementation (ii) DSP- implementation (iii) ASIC-implementation. DSP implementation of neural network doesn't support the parallel architecture which is required for neural networks. The re-configurability is not supported by the ASIC based neural network. FPGA implementation of neural network offers both the adaptability in reconfiguration and parallel architecture of neurons. Hence FPGA is better choice for the neural networks. Neural network consists of a set of nodes called neurons which are connected to each other. There can be ‘n’ inputs to a neuron and there is a weight associated with each interconnection between neurons. The neural network can learn by changing the weights of the connections based on the inputs to the neurons. The neural network has three layers namely input layer, hidden layer and output layer.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 594 Based on the complexity of the problem there can bea single hidden layer or multiple hidden layers. But a single hidden layer will be enough to solve most of the problems. 2.4.1 Feed Forward Propagation There are two algorithms used for neural network feed- forward algorithm and back propagation algorithm. There can’t be a neural network based on onlyfeedforwardoronly on back propagation algorithm. In feed forward the output sum is calculated for the network by taking the summation of the product of weights and the inputs to corresponding neurons. The activation functionisappliedtotheoutputsum to get the output. For the first feed forward iteration the weights are set randomly. Fig-4 shows the structure of a neuron. The circle represents the neuron which has x1, x2, x3, ….xn inputs and w1, w2, w3,…wn are the weights on the connections respectively. The output of a neuron is given by the equation y = f (p) (1) and the value of p is given by (2) Where xi is the ith input of the network and wi is the weight on the ith connection. The function f(p) is called the activation function of the neuron. Fig-9: structure of a neuron There are three types of activation functions namely Linear, Log-sigmoid and Tan-sigmoid functions as shown below. Linear function, (3) Sigmoid-function, (4) Tan-sigmoid function, (5) 2.4.2 Back Propagation In back propagation we calculate the error between the actual output and desired output then we try to adjust the weights to decrease the error. Same as the feed forward the back propagation calculations are applied at each level but the execution is carried out in reverse order i.e. from output layer to the input layer. Let’s first consider the output layer and hidden layer. First the error is calculated at the output by subtractingtheactual output from the desired output error = desired – actual Change in the output sum is calculated by takingtheproduct of derivation of activation functionandthe error. Wewill call this as the delta output sum. Delta output sum = S`(output sum) * ( error ) Where S`(output sum) isthe derivationofactivationfunction applied to the output sum. The change in the nets corresponding to output neurons is calculated by dividing the delta output sum by the hidden layer results. Delta weights = (delta output sum) / (hidden layer results) Change in the hidden layer sum is denoted by delta hidden sum and is calculated by following equation. Delta hidden sum = [delta output sum / hidden-to-output weights] * [ S`(hidden sum) ] Now the change in the weights between the input and hidden layer is calculated as follows Delta weights = delta hidden sum / input data This completes the back propagation.Afterthisfeedforward is applied and the process is repeated thousands of times to get more accurate results. 3 RESULTS We have tested our methodology on images of high resolution fundus (HRF) database. Sample outputs are as given in the following tables. Results obtained for sample glaucoma images are shown in table-1 and for sample healthy images are shown in table-2. Table-1: Glaucoma eye results Filenam e Cup area Disk area Rim area Cup/dis k ratio prediction 01_g 804.248 3019.071 2214.823 0.266 Glaucoma 02_g 1256.637 3019.071 1762.433 0.416 Glaucoma
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 595 03_g 1385.442 3959.192 2573.75 0.35 Glaucoma 04_g 1194.591 4185.387 2990.796 0.285 Glaucoma 05_g 1520.531 4656.626 3136.095 0.327 Glaucoma 06_g 1194.591 4185.387 2990.796 0.285 Glaucoma 07_g 1134.115 4071.504 2937.389 0.279 Glaucoma Table-2: Healthy eye results Filenam e Cup area Disk area Rim area Cup/dis k ratio Prediction 01_h 1075.21 5026.548 3951.338 0.214 Healthy 02_h 907.92 3739.281 2831.36 0.243 Healthy 03_h 0 4185.387 4185.387 0 Unknown 04_h 530.929 3848.451 3317.522 0.138 Healthy 05_h 962.113 4901.67 3939.557 .196 Healthy 06_h 855.299 4185.387 3330.088 0.204 Healthy 07_h 346.361 4901.67 4555.309 0.071 Healthy The extracted disk area, cup area and neuro retinal rim area are fed to the artificial neural network. The performance of ROC is as shown below. 3.1 Receiver Operating Characteristic curve (ROC) We have used 30 fundus images fromHRF imagedatabaseto determine the performance of our system. For training purpose 16 images (8 healthy and 8 glaucoma images) were used. Remaining 14 images were used during the testing phase, seven images were glaucoma eye images and remaining seven were healthy images. For all glaucoma images the system predicted the result as glaucoma affected and for 6 out of 7 healthy images it predicted the result as healthy eye. Therefore, accuracy can be given as here, Tp = true positive = glaucoma image being identified as glaucoma image = 7 Tn = true negarive = healthy image being identified as healthy image = 6 Fp = false positive = glaucoma image being identified as healthy image = 1 Fn = false negative = healthy image being identified as glaucoma image = 0 Therefore, accuracy= 13 / 14 = 92.85 % We obtained the accuracy of 92.85 %. The ROC graph is shown in fig-10. Fig-10: ROC graph CONCLUSION The proposed system will be very useful to detect glaucoma efficiently so that the disease can be diagnosed in the early stages. The system does not depend on trained glaucoma specialist and expensive HRT/OCT machines. In this project the glaucoma detection is done by extracting three features i.e. optic disk, optic cup and neuro-retinal rim from a digital fundus image. The artificial neural networks is used as a classifier to identify the disease. The thresholding approach is used for optic disk and optic cup segmentation. To determine the System performance 30 retinal images(16 images for training and 14 images for testing) were processed and their optic disk area, cup area and NRR area were computed. The system proposed can identify the presence of glaucoma to the accuracy of 92%. The accuracy of the system can further be increased by using the same camera settings for capturing the fundus images. Also it can be improved by using advanced segmentation techniques. ACKNOWLEDGEMENT I thank the management, Principal,HODandstaffofVLSI and EC department, K.L.E. Dr. M. S. Sheshgiri College of engineering and technology, Belagavi, Karnataka, India and my special thanks to my guide Dr. Nataraj Vijapur, Dept of VLSI for encouraging me for this work. REFERENCES [1] Sheeba O., Jithin George, “Glaucoma Detection Using Artificial Neural Network” IACSIT International Journal, Vol. 6, No. 2, April 2014. [2] Kurnika Choudhary, Shamik Tiwari,” ANN Glaucoma Detection using Cup-to-Disk Ratio and Neuro-retinal Rim”, International Journal of Computer Applications (0975 – 8887) Volume 111 – No 11, February 2015
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 596 [3] Akhade, Snehal B., V. U. Deshmukh, and S. B. Deosarkar. "Automatic optic disc detection in digital fundus images using image processing", 2014 International Conference on Green ComputingCommunicationandElectrical Engineering (ICGCCEE), 2014. [4] Gopal Datt Joshi, “Optic Disk and Cup Segmentation from Monocular Color Retinal Images for Glaucoma Assessment”, IEEE transactions on medical imaging, vol. 30, no. 6, june 2011 [5] Gayathri Devi T. M., Sudha. S. and Suraj. P., ,” Artificial Neural Networks in retinal image analysis” 2015 3rd International Conference on Signal Processing, Communication and Networking (ICSCN). [6] Megha Lotankar, Kevin Noronha, Jayasudha Koti, “Detection of Optic Disc and Cup from Color Retinal Images for Automated Diagnosis of Glaucoma”, 2015 IEEE UP Section Conference on Electrical Computer and Electronics (UPCON). [7] Esraa Zeki Mohammed, Haitham KareemAli,,”Hardware Implementation of Artificial Neural Network Using Field Programmable Gate Array”, International Journal of Computer Theory and Engineering, Vol. 5, No. 5, October 2013. [8] Philippe Dondon, Julien Carvalho and Rémi Gardere, ,” Implementation of a Feed-forwardArtificial Neural Network in VHDL on FPGA”, neural network applications in electrical engineering 2014. [9] Muthuramalingam, A. Himavathi, S. Sriniv. "Neural network implementation using FPGA: issues and application.(field programmable gate array)", International Journal of Information Tec, April 2007 Issue [10] www.explainstuff.com/introduction -to-neural- networks.html. [11] https://www.xilinx.com/support/documentation/boards_an d_kits/ug330.pdf [12] Megha Lotankar, Kevin Noronha, Jayasudha Koti. "Detection of optic disc and cup from color retinal images for automated diagnosis of glaucoma", 2015 IEEE UP Section Conference onElectrical ComputerandElectronics(UPCON), 2015. [13] High Resolution Fundus Image database https://www5.cs.fau.de/research/data/fundus-images/
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