Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1992-07-29
1994-08-16
Harvey, David E.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348695, H04N 516
Patent
active
053391144
ABSTRACT:
A video input signal to be displayed is applied to an offset clamp circuit which effects a DC offset of blanking and active video portions of each video line. The DC offset or shift is of an amount and in a polarity sense to place the black level of the active portion of an NTSC color standard signal at a level corresponding to blanking level of the NTSC color standard. Advantageously, subsequent clamping at the shifted level enables contrast control without altering the black level of displayed images.
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"Ire Standards on Television: Definition of Color Terms", 1955, Appendix B Full Text of FCC Tehcnical Standards Amended to Incorporate Color.
Keen Ronald T.
Lagoni William A.
Neal Charles B.
Coalter Richard G.
Emanuel Peter M.
Harvey David E.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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