Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-08-03
1991-07-30
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
354432, H04N 5238, G03B 708
Patent
active
050364006
ABSTRACT:
In an image sensing apparatus such as a video camera, an evaluating value for exposure control and determination of a gamma correction value is computed in response to a video signal obtained by an image sensing device for each of a plurality of sampling areas in a sensed image. When an evaluating value which exceeds an allowable range with respect to a predetermined reference value is included in the evaluating values, it is determined that an abnormal luminance portion exists in the corresponding sampling area, so that weighting of the evaluating value is decreased, whereby the effect of such an area on exposure adjustment is restrained. In addition, the picture contrast is computed from the ratio of the maximum value to the minimum value of the evaluating values, whereby the most suitable gamma correction value is determined based on this picture contrast.
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Greening Wendy R.
Groody James J.
Michaelson Peter L.
Sanyo Electric Co,. Ltd.
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