Abstract
Detection of the optic disc which has similar brightness with the hard and soft exudate lesions seen in the early stage of diabetic retinopathy is very difficult due to different light conditions and contrast values. Automatic detection of these lesions by expert systems in the medical field is very important. In this context, we propose a new approach based on the analysis of color spaces, keypoint detectors, and texture for retinal fundus images. If the keypoint information is contained within the actual optic disc region, this is an important consideration for the automated detection of the optic disc. This study can be divided into five sections, respectively, image preprocessing, image processing, keypoint detection, texture analysis, and performance evaluation. The analyses of patch images compatible with the keypoints obtained from the Red–Green–Blue (RGB) image and its color channels were carried out. The performance of the study was validated on the Digital Retinal Images for Vessel Extraction public dataset. According to the results, Local Binary Pattern texture analysis performed in region of interest around keypoints detected by different keypoint detectors presented good performance in RGB and green channel images.
Highlights
The optic disc (OD) is the main region in retinal images
All image processing steps except the keypoint detection and color channel were the same for analysis of each retinal image. 92.5%, 92.5%, and 92.5% success ratios were achieved using the keypoints detected by ORB, SIFT, and SURF
The proposed study was quite successful with the ORB, SIFT, and SURF keypoint detector algorithms on the RGB and green channel since 37 out of 40 optic disc regions detect successfully
Summary
The optic disc (OD) is the main region in retinal images. The coordinates of this region are need detected in order to determine other retinal structures such as macula and blood vessels [1]. OD is similar to hard and soft exudates with respect to color and brightness features [2]. The detection of this region in the retinal images with the anomaly is difficult. OD is the exit point of all vessels that spread to the retinal fundus image and this region is different from other bright regions. The characteristics of an optic disc region are generally as follows [3]:
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