Non-linear contrast control apparatus with pixel distribution measurement for video display system
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United States of America Patent
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Jun 6, 1995
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N/A
app pub date -
Aug 24, 1994
filing date -
May 22, 1992
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Abstract
A video signal to be processed is applied to a non-linear processor having an adjustable gain responsive to a control signal over at least one portion of the amplitude range of the video input signal. A sampling circuit, responsive to the video signal, generates video samples related to the video signal. A control circuit, responsive to the video samples, generates the control signal in accordance with the number of samples in at least a given amplitude range thereby controlling the percentage of samples of a given range in displayed images. Plural control and sampling circuits may be included provide control for white stretch processing, black stretch processing and video mid-point processing for enhancing contrast through out the entire video signal range.
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