Optic cup segmentation: Type-II fuzzy thresholding approach and blood vessel extraction

TitleOptic cup segmentation: Type-II fuzzy thresholding approach and blood vessel extraction
Publication TypeJournal Article
Year of Publication2017
AuthorsAlmoqbel, F., S. Alodhayb, K. Raahemifar, and V. Lakshminarayanan
JournalClinical Ophthalmology
Keywordsaccuracy, algorithm, Article, Blood vessel kinks, comparative study, eye fundus, Fuzzy type-II thresholding, Glaucoma, Image analysis, Image processing, Image segmentation, Optic cup, optic disk, optic disk cup, physical parameters, region of interest, Retinal fundus images, surgical approach, type II fuzzy thresholding approach, vascular surgery

We introduce here a new technique for segmenting optic cup using two-dimensional fundus images. Cup segmentation is the most challenging part of image processing of the optic nerve head due to the complexity of its structure. Using the blood vessels to segment the cup is important. Here, we report on blood vessel extraction using first a top-hat transform and Otsu’s segmentation function to detect the curves in the blood vessels (kinks) which indicate the cup boundary. This was followed by an interval type-II fuzzy entropy procedure. Finally, the Hough transform was applied to approximate the cup boundary. The algorithm was evaluated on 550 fundus images from a large dataset, which contained three different sets of images, where the cup was manually marked by six ophthalmologists. On one side, the accuracy of the algorithm was tested on the three image sets independently. The final cup detection accuracy in terms of area and centroid was calculated to be 78.2% of 441 images. Finally, we compared the algorithm performance with manual markings done by the six ophthalmologists. The agreement was determined between the ophthalmologists as well as the algorithm. The best agreement was between ophthalmologists one, two and five in 398 of 550 images, while the algorithm agreed with them in 356 images. © 2017 Almazroa et al.