Level compression of a video signal without affecting hue of a p

Details Level compression of a video signal without affecting hue of a p Level compression of a video signal without affecting hue of a p

1997-04-10

2000-08-29

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348255, 348645, 348655, H04N 977

Patent

active

061116076

ABSTRACT:
A level compression and/or gradation conversion of a video signal are performed without causing any change in the hue of a picture represented by that video signal. The knee compression and/or gradation conversion are carried out by multiplying red, green and blue primary color signals by a luminance gain, while the hue and saturation remain unaffected. If the level of any of the primary color signals still exceeds a predetermined threshold level, the saturation conversion is executed by using the saturation gain and the luminance component supplied from a controller. In the saturation conversion operation, the maximum level of at least one of the red, green and blue primary color signals is made coincident with the predetermined threshold level while the hue and luminance of the picture represented by the video signal are maintained unchanged.

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patent: 5680230 (1997-10-01), Kaburagi et al.
patent: 5729299 (1998-03-01), Suzuki et al.
patent: 5949482 (1999-09-01), Kawa

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