Chrominance-luminance separation method and filter performing se

Details Chrominance-luminance separation method and filter performing se Chrominance-luminance separation method and filter performing se

1994-06-21

1996-03-26

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348663, H04N 978

Patent

active

055025099

ABSTRACT:
Motion-adaptive chrominance-luminance separation of a composite video signal is accomplished by comb-filtering the video signal on the time axis, bandpass-filtering the video signal on at least one spatial axis selected according to spatial correlation detected in the video signal, and combining the two filtered results in proportion to motion detected in the video signal. Motion is detected in part by obtaining a one-frame difference signal that has been filtered to eliminate chrominance information; here too the filtering is performed on at least one spatial axis selected according to spatial correlation. Selecting the spatial filtering axes according to spatial correlation enables chrominance and luminance to be separated effectively without unnecessary information loss.

REFERENCES:
patent: 4754322 (1988-06-01), Okuda et al.
patent: 4982271 (1991-01-01), Sugiyama et al.
patent: 5345276 (1994-09-01), Hong
CBS Technology Center, "Digital TV Comb Filter With Adaptive Features," John P. Rossi, pp. 267-282, 1976.
Journal of the SMPTE, "Digital Television Image Enhancement," vol. 84, Jul. 1975, Rossi.

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