Digital Algorithm For Retinal Photogrammetry

David G. Falconer

doi:10.1117/12.956952

29 July 1980 Digital Algorithm For Retinal Photogrammetry

David G. Falconer

Proceedings Volume 0166, NATO Symposium on Applications of Human Biostereometrics; (1980) https://doi.org/10.1117/12.956952
Event: NATO Symposium on Applications of Human Biostereometrics, 1978, Paris, France

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.

Citation Download Citation

David G. Falconer "Digital Algorithm For Retinal Photogrammetry", Proc. SPIE 0166, NATO Symposium on Applications of Human Biostereometrics, (29 July 1980); https://doi.org/10.1117/12.956952

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