Patent
1984-09-14
1986-04-08
Adams, Russell E.
354432, G03B 2900, A61B 314
Patent
active
045808856
ABSTRACT:
An ophthalmic photographing apparatus for determining the exposure condition of ophthalmic photographs, includes an illuminating optical system for illuminating a subject to be photographed, a photographing optical system for photographing the subject, an exposure control system comprising light detecting means for detecting intensities of light reflected at a plurality of zones of the subject, boundary level setting means for dividing a region between the highest and lowest values of the light intensities detected by the detecting means into a plurality of sub-regions and determining a boundary value between each two adjacent sub-regions, exposure condition setting means for setting a selected one of the sub-regions, comparator means for comparing output of the detecting means with the boundary value related to the selected sub-region to thereby select the outputs included in the selected sub-region, and exposure control means for controlling exposure in accordance with the selected outputs of the detecting means.
A method for determining exposure condition of ophthalmic photographing comprising the steps of detecting intensities of light reflected at a plurality of zones in a subject to be photographed, dividing a region between highest and lowest values of the detected light intensities into a plurality of sub-regions, selecting one of the sub-regions and extracting the detected light quantities included in the selected sub-region, calculating a mean value of the extracted light intensities, and determining the exposure in accordance with the mean value of the extracted light quantities.
REFERENCES:
patent: 4264153 (1981-04-01), Ito
patent: 4306787 (1981-12-01), Fukuhara et al.
patent: 4394078 (1983-07-01), Terashita
patent: 4445778 (1984-05-01), Nakauchi
patent: 4476383 (1984-10-01), Fukuhara et al.
Adams Russell E.
Tokyo Kogaku Kikai Kabushiki Kaisha
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