Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1994-08-24
1995-06-06
Groody, James J.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348678, 348687, H04N 5202
Patent
active
054226805
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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patent: 4489349 (1984-12-01), Okada
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patent: 5003394 (1991-03-01), Lagoni
Type CX20125 Dynamic Picture Processing Integrated Circuit (Sony Corp.).
Bergen James R.
Christopher Todd J.
Lagoni William A.
Pica Albert P.
Coalter Richard G.
Emanuel Peter M.
Groody James J.
Hsia Sherrie
Thomson Consumer Electronics Inc.
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