H - Electricity – 04 – N
Patent
H - Electricity
04
N
354/29
H04N 5/243 (2006.01) H04N 5/202 (2006.01) H04N 5/235 (2006.01) H04N 5/238 (2006.01)
Patent
CA 1333821
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 set on an image sensed picture. When an evaluating value exceeding 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.
588018
R. William Wray & Associates
Sanyo Electric Co. Ltd.
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