Adaptive comb filter for artifact-free decoding

Details Adaptive comb filter for artifact-free decoding Adaptive comb filter for artifact-free decoding

1987-12-18

1989-07-11

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

048476820

ABSTRACT:
An adaptive comb filter employs vertical and horizontal edge detectors to selectively activate a vertical high-pass filter and a horizontal band-pass filter during the occurrence of vertical and horizontal edges in a received television signal, for use in the chrominance/luminance separation process. Artifacts such as "hanging dots" and "crawling dots", inherent in prior art comb filter circuits during the occurrence of vertical and horizontal edges in the composite television signal, are greatly reduced in the process.

REFERENCES:
patent: 4072984 (1978-02-01), Kaiser
patent: 4179705 (1979-12-01), Faroudja
patent: 4240105 (1980-12-01), Faroudja
patent: 4417270 (1983-11-01), Nagao et al.
patent: 4626894 (1986-12-01), Harwood et al.

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