Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-01-11
1989-10-24
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 27, 358 28, 358 80, H04N 974
Patent
active
048765899
ABSTRACT:
Improvements in a phase responsive video parameter control system for correcting hue, saturation and luminance of a phase encoded composite video signal are disclosed. The system has a phase detector that detects which of a plurality of color intervals or hue bands the instantaneous signal falls in. Luminance, hue and saturation corrections for each band are applied to the uncorrected video. The improvements include correction signal selection circuit that select the correction signals twice per subcarrier cycle, a damping circuit that smooths the transition between two correction signals when the hue moves to a different color interval or band, and a phase shifter that allows the centers of the bands to be moved without changing the width of the band.
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Fearing Craig F.
Hemsky Robert L.
Orsburn Michael L.
Schwarz Robert E.
Tucker Terry L.
Shepperd John W.
Utah Scientific Advanced Development Center, Inc.
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