Automatic Estimation of the Corneal Limbus in Videokeratoscopy

Morelande, Mark R., Iskander, D. Robert, Collins, Michael J., & Franklin, Ross J. (2002) Automatic Estimation of the Corneal Limbus in Videokeratoscopy. IEEE Transactions on Biomedical Engineering, 49(12), pp. 1617-1625.

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An algorithm for estimating the corneal limbus from videokeratoscopic images is proposed. After the image is transformed to a polar grid, a novel edge-detection procedure, suitable for the detection of the soft edge produced by the limbus, is used to locate the limbus. Outliers due to the eyelids, eyelashes, and videokeratoscopic rings are removed by taking advantage of the approximate circularity of the cornea. An ellipse which minimizes the sum of the squared algebraic errors is fitted to the remaining edge points. Comparisons between the proposed algorithm, a manual computer- based technique and an algorithm which uses conventional edge-detection techniques demonstrate the accuracy of the proposed algorithm.

Impact and interest:

22 citations in Scopus
17 citations in Web of Science®
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ID Code: 760
Item Type: Journal Article
Refereed: Yes
Keywords: Cornea, corneal centroid, soft, edge detection
DOI: 10.1109/TBME.2002.805481
ISSN: 0018-9294
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2002 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 02 Mar 2005 00:00
Last Modified: 10 Aug 2011 14:09

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