Referenced Items are not available for this document.
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.
Published in:
Biomedical Engineering, IEEE Transactions on
(Volume:49
,
Issue:
12
)
Date of Publication: Dec. 2002
- Page(s):
- 1617 - 1625
- ISSN :
- 0018-9294
- INSPEC Accession Number:
- 7497117
- Digital Object Identifier :
- 10.1109/TBME.2002.805481
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 January 2003
- Issue Date :
- Dec. 2002
- Sponsored by :
- IEEE Engineering in Medicine and Biology Society
- PubMed ID :
- 12549744
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