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CATARACT DISEASE DETECTION AND CLASSIFICATION USING RETINAL IMAGE MODEL
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1273 CATARACT DISEASE DETECTION AND CLASSIFICATION USINGRETINAL IMAGE MODEL Subhashree Sarangi 1 , Dr. Chandra Sekhar Panda 2 1 M.Phil Research Scholar, Department of Computer science and ApplicationsSambalpur University, Jyotivihar Burla 2 Associate Professor & Head, Department of Computer science andApplications Sambalpur University, Jyotivihar Burla -----------------------------------------------------------------***----------------------------------------------------------------- Abstract- Among the most common blindness hasseveral causes that is cataract, especially among the elderly. According to WHO/NPCB surveys, India has approximately 12 million blind persons, with cataract accounting for 80.1 percent of those cases. Therefore detecting a cataract in the early stage is a very important as well as difficult task. There are different types of image models currently being used by researchers for problems related to eye. The utilization of five different imaging modalities specifically for automated cataract detection is presented. More focus is given to the retinal images for the cause of cataract detection as it is considered better for extraction of the macula, lesion, blood vessels, optic disc, fovea, and macula are all components of the macula are all featuresto look for. Detecting these features accurately can solvemany problems related to eye disease including diagnosis and grading of cataracts automatically. In this research article we explore the potential of different retinal imaging methodologies currently employed by many of the researchers along with their advantages and disadvantages. Through the research an automated approach for segmenting retinal images has been developed. The segmentation is achieved by an iterative region expanding approach that merges the contents of numerous binary images produced by vessel width dependent morphological filters. Finally, the suggested work's experimental results and evaluation are shown, which reveal promising results. Keywords: Cataract, retinal image, feature extraction, segmentation, morphological filter 1. INTRODUCTION The eye is a complicated system that serves as a vital component of our bodies. The retina, iris, pupil, and optic nerve are all interconnected elements of the eye. Glaucoma, trachoma, age-related macular degeneration, pathological myopia, retinitis pigmentosa, and diabetic retinopathy are all disorders that have an influence on the eye. Patientsare sometimes unaware of the severity of their illness. It is incredibly difficult to appropriately impair eyesight due to late identification of eye disorders. [1]. After an eye exam with various technologies such as a slit lamp, retinal examination, or visual acuity tests, an ophthalmologist or optometrist diagnoses eyeproblems [3]. A printed chart or a sequence of smaller characters read with a viewing device are used to perform visual acuity tests [3]. The ophthalmologist examines the eye under magnification with a strong line of light using a slit lamp [4]. During a retinal examination, the pupil is dilated using drops to help widen the eye lens and analyse eye movements and papillary response. However, these procedures need the use of expensive medical equipment that can only be used by ophthalmologists with extensive experience. Because these processes are manual, they are both time- consuming and subjective based on ophthalmologist experience. As a result, academics have made various attempts in recent years to automate the identificationof eye diseases. Fig 1: Normal eye versus Cataract eye [7] Cataracts are the cause of 47.8% of all blindness cases in the world. Advanced age is the most significant risk factor for cataract development. Over 314 million people are blind or partially blind around the world. Sixty-seven percent of those who are blind are blind owing to cataracts.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1274 More than 90 percent of the world's blind population live in developing countries. The World Health Organization (WHO) defines a cataract as a clouding of the eye's lens that inhibits light from passing through due to protein clumping together as people age. These proteins grow up only when the older cells compress into the lens's centre, resulting in a fuzzy view of the retina. [5]. Early diagnosis of cataracts is a little-discussed area forongoing research, despite the fact that it is one of the most common eye illnesses and the main cause of blindness worldwide. Nuclear cataract, cortical cataract, and posterior subcapsular cataract are the three types of cataracts that can arise depending on where they form or how they form [2]. The most frequent type of cataract produced by age is nuclear cataract (NC). The hardening and yellowing of the nucleus, the centre component of the eye lens, is the most common reason [8]. Cortical cataract (CC) is a type of cataract that develops in the lens cortex and appears as white wedged-shaped and directed opacities that move from the lens's border to the centre in a spoke-like pattern [8]. PSC (posterior subcapsular cataract) appears as little breadcrumbs or sand particles beneath the lens capsule. It is especially common in steroid-addicted and diabetic people [8]. The numerous types of eye cataracts are depicted in Figure 2. Fig 2: Types of Eye Cataract Cataracts are diagnosed by an ophthalmologist by examining the changes in the eye lens. After cataract detection, grading can be done by comparing slit- lamp pictures to a collection of standard images using various grading systems. The most often used grading techniques are the Lens Opacities Classification System III (LOCS-III) [9] and the Wisconsin Grading System (WGS) [10]. 2. IMAGEMODELS 2.1 Digital Images The use of digital camera photos for cataract screening becomes intriguing when considering thehealth services in underdeveloped countries. A digital camera is also a simple and easy-to-use instrument when compared to a slit lamp and othercomplex medical equipment used for cataract diagnosis. 2.2 Slit-Lamp Images Nuclear cataract is typically detected using slit-lamp imaging. Because nuclear cataract affects the nucleus of the eye lens, characteristics from the nucleus area are extracted for automated identification and grading. [9,10]. (a) (b) (c) (d) (e) Fig 3: Sample images of each image model (a)Digital image (b) Slit-lamp images (c) Retro- illumination image (d) Retinal image (e) Ultrasonic image 2.3 Retro-illumination Images A non-stereoscopic image obtained using a "Neitz CT-R cataract camera to concentrate on the anterior/posterior cortex of the lens"[10] is recognized as retro-illumination. Cortical and posterior subcapsular cataracts are examined using a retro imaging. 2.4 Ultrasonic Images Ultrasound is a popular technique for diagnosing ocular disorders. For cataract diagnosis, ultrasound A-scan signals are collected using an ultrasound scanner equipped with 30–60MHz ultrasonic transducers from porcine lenses. B-scan and Nakagami images are created using the acoustic parameters velocity, attenuation, and backscattering signals [22].
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1275 2.5 Retinal Images The diagnosis of eye-related disorders such as macular degeneration, diabetic retinopathy, and glaucoma has long relied on retinal fundus imaging. [11–13]. Although retinal (fundus) scans of the eye haverarely been used for cataract diagnosis and grading, several studies have attempted to identify cataract using these images andhave achieved a high accuracy rate. The fundus camera is simple to use and can be operated by technologists or even patients. Retinal pictures have been employed widely in the diagnosis of ophthalmological illnesses such as glaucoma [16- 17], age-related macular degeneration [18–19], and diabetic retinopathy [20–21] since the invention of the fundus camera in 1910. Furthermore, this technique has been investigated in an attempt to automatically quantify cataract severity [22–23]. Some attempts at detection in smartphone-based systems have also been made [15]. Figure 4 shows four typical retinal pictures, exhibiting non-cataract, mild, moderate, and severe cataracts. Figure 4(a) shows a healthy retina with clearly visible main vessels, optic disc, choroid, and even capillary vessels. Figure 4(b) shows an image with a mildcataract, with the main vessels and optic disc visible,but the choroid and capillary vessels only faintly visible. Only the main blood veins and the optic disc are seen in Figure 4(c). Furthermore, in Figure 4, there are essentially no retinal structures visible (d).It can be assumed that more severe cataracts revealfewer retinal structures. Fig 4. Retinal images: (a) non-cataract, (b) mild cataract, (c) moderate cataract, and (d) severe cataract. A cataract is a slow-growing eye condition that can be partial or total, stationary or progressing. Patients with various degrees of cataracts require different therapies. Patients with light cataracts might delay degeneration by wearing antiglare sunglasses [24], whereas intermediate and severe cataract patients require surgical intervention [25]. It is feasible to discern the different levels of severity by extracting suitable information from retinal pictures. 3. RELATEDWORKS Automatic cataract detection using retinal images has attracted significant attention, and was discussed in [26-28]. Various methods which can be used for cataract detection and classification using retinal image model is discussed further. 3.1 Transformation based approach: [29] offereda study for cataract detection utilising retinal pictures and the Fourier transform. Due to variable amounts of blurriness, the high- frequency component distributions of retinal pictures differ. The high-frequency component distribution curveis used to assess the cataract severity. The results show that the performance of this method has a good association with the LOCS III score, indicating that the retinal image-based method is genuine. 3.2 Global feature-based approach: In [30-31], the Haar wavelet and discrete cosine transformation (DCT) were utilised to investigate four-class categorization using retinal pictures. In both the discriminant analysis and the supervised technique, the results showed that the Haar wavelet feature achieves higher accuracy than the DCT feature. [32] employed texture andmorphological data, and the findings showed that based on the BP- net, this strategy also produced pretty good accuracy. The performance of the Haarwavelet, DCT, and texture features were summarised in [33], which suggested an ensemble learning- based technique. The results showed that the Haar wavelet feature outperforms the DCT and texture features in terms of accuracy. 3.3Local feature-based approach: In [34], the local standard deviation was employed. The local standard deviations of the coefficients and the other eight features were extracted after the blood vessels were strengthened by match filtering in different orientations. Retinal pictures with various cataract severities were effectively categorised using a decision tree [35].
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1276 3.4 Deep feature-based approach: In [36], deep CNN (DCNN)-based categorization was used, and the DCNN achieved somewhat better accuracy than the other approaches. However, when thetraining samples are near to 2000, the accuracy reaches a relatively high and steady level, necessitating significantly more photographs than other relevant efforts. Table 1: Literature review table of methods usedin retinal image model for cataract detection andclassification Sl No Approaches Methods Authors Advantages Disadvantages 1 Transformati on based approach Fourier Transform Abdul- Rahman et al.[29] Exhibits strong correlation with the LOCS III score Frequency component may differfor various levels of blurriness 2 Global features based approach Haar wavelet Fan et al. [30] Low cost running detection procedures. This method can achieve the highest accuracy by applying different global features in less time and less memory overhead. It cannot be used for some particular applications wherethe illumination level of images is very low. Discrete cosine transformation Guo et al. [31] Texture and morphological feature based method Yang et al.[32] Ensemble learning- based method Yang et al.[33] 3 Local Local standard Xiong et al.[34] Many features can be The local standard deviation features deviation extracted locally so alone gives low accuracy, it needs based that it can be used as a some other methods to be fused approach good numerical ability together. Zhang et al.[35] Decision tree based for high order tasks. method 4 Deep features based approach Deep CNN Zhang et al.[36] Gives a slight higher accuracy than above methods. Needs a large no of data set for training purpose thus use more cost, time and System overhead.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1277 4. PERFORMANCEEVALUATIONMETRICS To evaluate how accurate a system is, i.e. to measure its performance, many evaluation metrics can be used like Accuracy, Specificity, Precision, Recall, F1 score and mean square errorrate. True Positive (T P: f + +): The number of instances that were positive (+) and correctly classified as positive (+). False Negative (FN: f + −): The number of instances that were positive (+) and incorrectly classified asnegative (-). It is also known as Type 2 Error. False Positive (FP: f − +): The number of instances that were negative (-) and incorrectly classified aspositive (+). It is also known as Type 1 Error. True Negative (TN: f − −): The number of instances that were negative (-) and correctly classified as negative (-). 5. CONCLUSION The strain on ophthalmologists and clinicians is reduced by automatic cataract identification and grading. It also offers an objective approach to assess the severity of cataracts and aids in the reduction of visual loss through quick and precise diagnosis. This document provides an overview of the procedures and approaches used to identify and grade cataracts. The use of five different imaging modalities for automated cataract diagnosis using digital image processing is demonstrated. Slit-lamp images, retro- illumination images, retinal images, ultrasonic images, and digital eye images are examples of these sorts.. Retinal images are considered good for featureextraction so features like lesion, blood vessels, optic disc, fovea, and macula can be detected which can beused for automatic cataract detection and grading. The scale of the visible retinal structure is the most valuable information for evaluating cataract severity. Also, if we consider among all the approaches used in retinal image model then global feature based approach specially texture based and morphological method is much suitable for cataract detection and classification as it is a low cost running detection procedure. Also, this method can achieve the highest accuracy by applying different global features in less time and less memory overhead. 6. REFERENCES 1) Zhang, Z., Srivastava, R., Liu, H., Chen, X., Duan, L., Wong, D. W. K., Kwoh, C. K., Wong, T. Y.,& Liu, J. (2014). A survey on computer aided diagnosis for ocular diseases. BMC Medical Informatics and Decision Making. 2) Retrievedfromhttp://www.medindia.net/patient s/p atientinfo/cataract.htm 3) Retrievedfromhttp://www.athenseyecare.net/co ndit ions/cataracts/? 4) Retrievedfromhttp://www.parentyourparents.c om/pyp_article/cataracts/? 5) Seddon, J., Fong, D., West, S. K., & Valmadrid, C. T. (1995). Epidemiology of risk factors for age- related cataract. Survey of Ophthalmology, 39(4), 323–334. 6) Pizzarello, L., Abiose, A., Ffytche, T., Duerksen, R., Thulasiraj, R., Taylor, H., & Resnikoff, S. (2004). VISION 2020: The right to sight: A global initiative to eliminate avoidable blindness. Archives of Ophthalmology, 122(4),615–620. 7)Retrieved from http://www.eyecenter.com.ph/what- wedo.html#ripen.©Copyright2011. American EyeCenter. 8) Delcourt, C., Cristol, J. P., Tessier, F., Léger, C. L., Michel, F., Papoz, L., & POLA Study Group. (2000). Risk factors for cortical, nuclear, and posterior sub-capsular cataracts: the POLA study. AmericanJournalofEpidemiology,151(5),497
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of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 01 | Jan 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1278 –504. 9) Chylack, L. T., Wolfe, J. K., Singer, D. M., Leske, M. C., Bullimore, M. A., Bailey, I. L., Friend, J., McCarthy, D., & Wu, S. Y. (1993). The lens opacities classification system III. Archives of Ophthalmology, 111(6), 831–836. 10)Panchapakesan, J., Cumming, R. G., & Mitchell, P. (1997). Reproducibility of the Wisconsin cataract grading system in the Blue Mountains Eye Study. Ophthalmic Epidemiology, 4(3), 119–126. 11) Akram, M. U., Tariq, A., Khan, S. A., & Javed, M. Y. (2014). Automated detection of exudates and macula for grading of diabetic macular edema. Computer Methods and Programs in Biomedicine, 114(2), 141–152. 12) Akram, M. U., Khalid, S., Tariq, A., Khan, S. A., &Azam, F. (2014). Detection and classification of retinal lesions for grading of diabetic retinopathy. Computers in Biology and Medicine, 45, 161–171. 13) Akram, M. U., Khalid, S., Tariq, A., & Javed, M. Y.(2013). Detection of neovascularization in retinal images using multivariate m-Mediods based classifier. Computerized Medical Imaging and Graphics,37(5),346–357. 14) Tsui, P. H., Huang, C. C., Chang, C. C., Wang, S. H., & Shung, K. K. (2007). Feasibility study of using high-frequency ultrasonic Nakagami imaging for characterizing the cataract lens in vitro. Physics in Medicine and Biology, 52(21), 6413. 15) B. Raju, N. S. D. Raju, J. D. Akkara and A. Pathengay, “Do It Yourself Smartphone Fundus Camera-DIYretCAM,” Indian Journal of Ophthalmology, Vol.64, No.9, pp.663–667, 2016. 16) S. Dua, U. R. Acharya, P. Chowriappa and S.V. Sree, “Wavelet Based Energy Features for Glaucomatous Image Classification,” IEEE Transactions on Information Technology in Biomedicine, Vol. 16, No. 1, pp. 80–87, 2012. 17) S. Yousefi, M. H. Goldbaum, M. Balasubramanian et al., “Glaucoma Progression Detection Using Structural Retinal Nerve Fiber Layer Measurements and Functional Visual Field Points,” IEEE Transactions on Biomedical Engineering, Vol. 61, No.4, pp. 1143–1154, 2014. 18) L. Giancardo, F. Meriaudeau, T. P. Karnowski et al., “Exudate Based Diabetic Macular Edema Detection in Fundus Images Using Publicly Available Datasets,” Medical Image Analysis, Vol. 16, No.1, pp.216–226, 2011. 19) S. Kankanahalli, P. M. Burlina, Y. Wolfson, D. E. Freund and N. M. Bressler, “Automated Classification of Severity of Age Related Macular Degeneration from Fundus Photographs,” Investigative Ophthalmology & Visual Science, Vol. 54, No. 3, pp. 1789– 1796, 2013. 20) M. R. K. Mookiah, U. R. Acharya, C. K. Chua, C. M. Lim, E. Y.K. Ng and A. Laude, “Computer-aided Diagnosis of Diabetic Retinopathy: A Review,” Computers in Biology & Medicine, Vol. 43, No. 12, pp. 2136–2155, 2013. 21) C. Sinthanayothin, J. F. Boyce, T. H. Williamson et al., “Automated Detection of Diabetic Retinopathy on Digital Fundus Images,” Diabetic Medicine, Vol.19, No.2, pp.105–112, 2002. 22) O. Hockwin, V. Dragomirescu and H. Laser, “Measurements of Lens Transparency or Its Disturbances by Densitometric Image Analysis of Scheimpflug Photographs,” Graefes Archive for Clinical & Experimental Ophthalmology, Vol. 219, No.6, pp. 255–262, 1982. 23) S. K. West, F. Rosenthal, H. S. Newland and H. R. Taylor, “Use of Photographic Techniques to Grade Nuclear Cataracts” Investigative Ophthalmology & Visual Science, Vol. 29, No. 1, pp. 73–77, 1988. 24) K. Pesudovs and D. B. Elliott, “Cataract Morphology, Classification, Assessment and Referral,” CE Optometry, Vol. 4, pp. 55–60, 2001.
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