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Pattern Recognition
Volume 24, Issue 3 , 1991, Pages 253-262

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doi:10.1016/0031-3203(91)90067-F
Copyright © 1991 Published by Elsevier Science B.V.

##

Automatic assembly of ocular fundus images

D. T. Phama and M. Abdollahib

a Intelligent Systems Research Group, School of Electrical, Electronic & Systems Engineering, University of Wales College of Cardiff, PO Box 904, Cardiff CF1 3YH, U.K.
b IRI VISION Ltd, Stowe House, 1688 High Street, Knowle, Solihull, West Midlands B93 0ND, U.K.
Received 2 March 1990; accepted 2 August 1990. ; Available online 19 May 2003.

## Abstract

This paper describes a method of assembling (grouping) ocular fundus images to construct a complete view of the retina. The method uses the structural information contained in the vascular network and is based on finding all possible match locations by comparing blood vessel skeleton segments in pairs of images. The match locations are further analysed at a global level to arrive at the appropriate relative translation and rotation values. To ensure that no discontinuity exists in the complete view, a refinement process is applied to the computed relative translation and rotation values. Typical results obtained from the analysis of various samples yielded maximum translation and rotation errors of 2 pixels and 1° respectively. The former corresponds to a positioning error of 0.6 mm, if the retinal photographs were used for manual assembly. The development of the algorithm and a sample of the results obtained are presented.

Author Keywords: Image processing; Assembly; Ocular fundus image; Diabetic retinopathy

|  | This Document |  |
|  |  | Abstract |  |
|  | External Links |  |
|  | Actions |  |
|  |  | Cited By |  |
|  |  | Save as Citation Alert |  |
|  |  | E-mail Article |  |
|  |  | Export Citation |  |
Pattern Recognition Volume 24, Issue 3 , 1991, Pages 253-262

|  |  |  | 36 of 40 |

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