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School of Computer Science

Lincoln School of Computer Science
University of Lincoln
Brayford Pool
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ONHSD – Optic Nerve Head Segmentation Dataset

The optic nerve head is a key landmark in the retina. In this project we have developed accurate methods based on active contours that exploit the particular appearance properties of the ONH to accurately segment.

This dataset contains 99 fundal images taken from 50 patients randomly sampled from a diabetic retinopathy screening programme; 96 images have discernable ONH. The subjects are from various ethnic backgrounds (Asian 20%, Afro-Caribbean 16%, Caucasian 50%, Unknown 14%); 19 have type 2 diabetes mellitus, while the diabetes status was unavailable for the remaining 31. The images were acquired using a Canon CR6 45MNf fundus camera, with a field angle lens of 45 degrees, resolution 640 x 480. Images were converted to grey-scale by extracting the Intensity component from the HSI representation. There is considerable quality variation in the images, with many characteristics that can affect segmentation algorithms. The ONH centre has been marked up a clinician. Then, four clinicians marked the ONH edge where it intersects with radial spokes (at 15 degree angles) radiating from the nominated centre. These multiple nominations of the edge can be used to characterize the degree of subjective uncertainty in the edge position.

The attached dataset allows for comparative study of alternative algorithms, and includes MATLAB code for our method, and for performance evaluation.

The datasets can be used, free of charge, for research and educational purposes. Copying, redistribution, and any unauthorized commercial use is prohibited. The use of these datasets is restricted to those individuals or organizations that obtained the datasets directly from this website. Any researcher reporting results which use one of these datasets must acknowledge us. We request you to do so by citing its relevant publication. Please also inform us of your results so that we can provide a citation and record comparative results on the site.

Click here to download this dataset

Contact us

Dr. Bashir Al-Diri (PhD., MSc., BSc., FHEA)
Lincoln School of Computer Science
University of Lincoln
Brayford Pool
Lincoln LN6 7TS
United Kingdom
Email My Webpage Phone: +44 1522 837111
Fax: +44 1522 886974