Processing methods using adaptive threshold for removal of chrom

Details Processing methods using adaptive threshold for removal of chrom Processing methods using adaptive threshold for removal of chrom

1987-02-20

1988-03-15

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 16, 358 36, H04N 1114, H04N 978

Patent

active

047316608

ABSTRACT:
A comb filter for improved cross-color reduction with improved visible diagonal resolution is provided for processing a luminance component of a quadrature modulated color subcarrier television signal in the vicinity of the color subcarrier pass band. The comb filter comprises an input and an output, and has a first path including a delay circuit for delaying the luminance component and a subtraction circuit connected between the input and the output, and has a second path including a chrominance type comb filter, a band pass filter for passing a spectrum in the vicinity of the color subcarrier pass band both being followed by a variable threshold circuit connected to the subtraction circuit. The variable threshold circuit is for inhibiting the signal in the second path below a variable threshold. The variable threshold is derived as a function of at least one of luminance diagonal transition level, chroma level and averaged luminance activity in the spectrum in the vicinity of the color subcarrier.

REFERENCES:
patent: 4345268 (1982-08-01), Clarke
patent: 4638351 (1987-01-01), Clarke
patent: 4656502 (1987-04-01), Hausdorfer

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