Video signal processing method and apparatus employing luminance

Details Video signal processing method and apparatus employing luminance Video signal processing method and apparatus employing luminance

1997-04-03

1998-09-22

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Special effects

348708, 348712, 348713, H04N 974, H04N 977

Patent

active

058122133

ABSTRACT:
A video signal processing apparatus for separating a video input into a luminance signal and a chroma signal which are sent respectively for individualized special effect processing. Special effect signals are fed to a control unit. The levels of a luminance signal and a chroma signal having undergone the special effect processing are estimated by a program. Based on the result of the estimate, a limiter controls the gains of the chroma signal following the special effect processing. In this setup, the gains of the chroma signal are controlled so that the level of a composite video signal will fall within a predetermined range of levels in keeping with the contents of the special effect processing performed on the luminance signal and chroma signal.

REFERENCES:
patent: 4635101 (1987-01-01), Nakayama
patent: 5208662 (1993-05-01), Song
patent: 5657094 (1997-08-01), Moriwake

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