Photometric apparatus

Details Photometric apparatus Photometric apparatus

1991-12-17

1992-08-04

Hix, L. T.

354432, G03B 1300

Patent

active

051363259

ABSTRACT:
In photometric apparatus, averaged brightness information, which counteracts the deleterious effects of a varying light source, such as a fluorescent lamp, is obtained much more rapidly than averaged brightness information obtained after a substantial number of cycles of operation of a storage type image sensor normally used for photometry. Use is made of brightness information obtained from a photoelectric conversion device of the type normally used for focus detection. Photoelectric conversion signals obtained from the photoelectric conversion device are averaged, and image sensor brightness information obtained from the image sensor after only one cycle of image sensor operation is corrected in accordance with the photoelectric conversion brightness information and the averaged photoelectric conversion brightness information, so as to make the image sensor brightness information correspond to averaged image sensor brightness information obtained by averaging the image sensor signals over a plurality of image sensor operation cycles.

REFERENCES:
patent: 4476383 (1984-10-01), Fukuhara et al.
patent: 4561749 (1985-12-01), Utagawa

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