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Abstract #46312 Published in IGR 13-2
A machine vision method for automated alignment of fundus imaging systems
Moscaritolo M; Knezevich 3rd FP; Zimmer-Galler I; Jampel H; Zeimer ROphthalmic surgery, lasers & imaging : the official journal of the International Society for Imaging in the Eye 2010; 41: 607-613
To report a method to track the pupil in three axes simultaneously prior to imaging the fundus. The system is based on parallax optical alignment to detect the center of the pupil. The system consists of two cameras acquiring pupil images from two distinct directions and an operator-supervised algorithm to derive the coordinates of the pupil center and output of commands to drive a three-axes computer-controlled stage. The system was tested in a cohort of 45 individuals 61 (plus or minus) 15 years of age, 26 with and 19 without glaucoma. The tracking was performed without pharmacologic pupil dilation. The variability of the pupil center determination (assessed by the standard deviation) was (plus or minus) 0.19 and (plus or minus) 0.33 mm for the vertical and horizontal directions, respectively. The processing time of the algorithm was 0.75 msec. The tracking converged to within a preset tolerance of (plus or minus) 0.5 mm in 45 of the 45 eyes. Image acquisition and processing of pupil images can be used to align fundus imaging systems rapidly, accurately, and with minimal operator intervention.
M. Moscaritolo. Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA.
Classification:
6.9.5 Other (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis)
