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Proceedings Paper

Digital Algorithm For Retinal Photogrammetry
Author(s): David G. Falconer
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Paper Abstract

Digital photogrammetry provides a convenient and inexpensive means for determining the threedimensional geometry of the optic nervehead from stereophotographs of the ocular fundus. SR l's photogrammetry algorithm, STEREO, measures the relative height of each point of the ocular fundus by correlating the right and left images of the stereopair. The correlated regions are expanded and contracted in a dynamic fashion to increase the statistical confidence in the height estimate and avoid edge blurring, respectively. The resulting height map is then smoothed with a shrinking operator to remove obviously anomalous structure. Next, colorimetric and densitometric procedures extract the disc boundry in a repeatable way. Finally, the depth and volume of the optic cup are measured with a planimetry algorithm.

Paper Details

Date Published: 29 July 1980
PDF: 3 pages
Proc. SPIE 0166, NATO Symposium on Applications of Human Biostereometrics, (29 July 1980); doi: 10.1117/12.956952
Show Author Affiliations
David G. Falconer, SRI International (United States)


Published in SPIE Proceedings Vol. 0166:
NATO Symposium on Applications of Human Biostereometrics
A. M. Coblentz; Robin E. Herron, Editor(s)

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