Motion adaptive luminance and chrominance signal separating circ

Details Motion adaptive luminance and chrominance signal separating circ Motion adaptive luminance and chrominance signal separating circ

1997-03-31

1999-07-27

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348667, 348669, 348670, H04N 978

Patent

active

059299380

ABSTRACT:
A circuit for separating composite video signals into luminance and chrominance signals in response to motion of a displayed image. A motion detecting section detects motion of an image to be displayed on a television screen according to input composite video signals in order to generate motion sensing signals corresponding to motion of the image. A first comb-filtering section adaptively comb-filters input composite video signals in a vertical direction according correlation among three continuous horizontal scanning lines to separate input composite video signals into first comb-filtered chrominance signals and first comb-filtered luminance signals. A second comb-filtering section adaptively comb-filters input composite video signals in the time direction in response to a correlation between frames in order to separate the input composite video signals into the second comb-filtered chrominance signals and the second comb-filtered luminance signals. A mixing section mixes the first comb-filtered chrominance signals with the second comb-filtered chrominance signals in order to generate motion adaptive chrominance signals, and the first comb-filtered luminance signals with the second comb-filtered luminance signals in order to generate motion adaptive luminance signals, in response to the motion sensing signal. Therefore, the circuit can separate composite video signals into luminance signals and chrominance signals without generating the hanging dot and dot crawl phenomena.

REFERENCES:
patent: 4851904 (1989-07-01), Miyazaki et al.
patent: 5146318 (1992-09-01), Ishizuka
patent: 5225899 (1993-07-01), Park
patent: 5345276 (1994-09-01), Hong
Patent Abstracts of Japan, vol. 014, No. 414 (E-0975), Sep. 7, 1990 & JP 02 159808A (Fujitsu Ltd), Jun. 20, 1990.
Patent Abstracts of Japan, vol. 018, No. 060 (E-1499), Jan. 31, 1994 & JP 05 276531 A (NEC Corp), Oct. 22, 1993.

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