Adaptive video comb filter with legalized output signals

Details Adaptive video comb filter with legalized output signals Adaptive video comb filter with legalized output signals

1996-06-13

1997-09-02

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348667, 348668, H04N 978

Patent

active

056637713

ABSTRACT:
A video comb filter for PAL or NTSC TV standards separates luminance and chrominance signals from a composite video signal by adaptively selecting between at least two different filtering processes, depending on whether the chroma output of the processes is "legal" (is within certain limits) in terms of both magnitude and phase. The present comb filter has a two horizontal scan line delay, and is such that the magnitude and phase of a chrominance signal output from the filter never exceeds that of a single band pass filtered version of the composite video and subsequently does not invert the phase of the luminance signal. The chrominance output signal characteristic is similar to that a four scan line filter; however, because the present filter only uses two lines of delay, any vertical cross luminance occurs across only two scan lines and the diagonal luminance resolution is significantly improved. The output of the comb filter is "legal" (within the RGB color cube) at all times.

REFERENCES:
patent: 4961108 (1990-10-01), Perlman
patent: 4994906 (1991-02-01), Moriwake
patent: 5155582 (1992-10-01), Tokoi
patent: 5424784 (1995-06-01), Raby
patent: 5548342 (1996-08-01), Ikeda

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