Still video camera having effective imager sensitivity optimized

Details Still video camera having effective imager sensitivity optimized Still video camera having effective imager sensitivity optimized

1987-05-29

1988-10-25

Adams, Russell E.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358227, H01N 526

Patent

active

047807660

ABSTRACT:
The control computer of a still video camera provides discrete video gain adjustments to the signal processing section during preview operation of an electronic viewfinder. Because exposure time is fixed for preview, and depth of field can be dramatically larger than for still recording, focusing discrepancies can arise between the viewfinder display and the subsequent still recording. This is true especially as light levels are increasing. Discretely varying the video gain has the effect of discretely varying the effective exposure value at the plane of the image sensor. Thus, by lowering video gain during preview for high light levels and concomitantly reducing the exposure value, the viewfinder aperture is driven further open to a value more closely matching the still aperture. As a large aperture means reduced depth of field, focusing errors are reduced.

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Research Disclosure, Apr. 1983, No. 22822, pp. 157-159.
Research Disclosure, Mar., 1982, No. 21504, pp. 70-71.

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