Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-08-25
1991-03-26
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358169, 358174, H04N 557
Patent
active
050033948
ABSTRACT:
A television system is disclosed including sections for limiting peak white drive to a display device (e.g., of the direct view of projection type) while maintaining relatively high subjective image contrast and brightness. Specifically, the system includes an automatic contrast control section for controlling the amplitude of the luminance signal in response to the peak value of a luminance-representative image component signal preceded by a "white-stretch" control section for emphasizing mid-range luminance components relative to high-range luminance components as a function of the average value of the luminance-representative image component. In this way, spot blooming and display driver saturation can be minimized while providing subjectively sharp, bright pictures.
REFERENCES:
patent: 4489349 (1984-12-01), Okada
patent: 4599643 (1986-07-01), Harlan
patent: 4651210 (1987-03-01), Olson
patent: 4654710 (1987-03-01), Richard
patent: 4843472 (1989-06-01), Shinada
patent: 4918529 (1990-04-01), Douziech et al.
patent: 4937670 (1990-06-01), Whitledge
patent: 4937671 (1990-06-01), Engel
Britton Howard W.
Emanuel Peter M.
Powell Mark R.
RCA Licensing Corporation
Tripoli Joseph S.
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