Adaptive comb filter

Details Adaptive comb filter Adaptive comb filter

1990-07-16

1991-09-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358138, H04N 1104, H04N 713

Patent

active

050478389

ABSTRACT:
A subnyquist sampling filter which results in less loss of picture resolution. An adaptive prefilter perform low-pass filter processing on a series of picture signals sampled in the form of a square lattice in a direction in which it has been determined that the degree of change of the picture signal at the periphery of an extracted picture element is a minimum. An adaptive interpolation filter performs interpolation processing on the picture signal obtained by subnyquist sampling with a subsampler the picture signal output from the adaptive prefilter in the direction where the degree of change of the picture signal level at the periphery of the abstracted picture elements is a minimum.

REFERENCES:
patent: 2921124 (1960-01-01), Graham
patent: 4141035 (1979-02-01), Maxemchuk et al.
patent: 4320416 (1982-03-01), Dischert et al.
patent: 4352122 (1982-09-01), Reitmeier et al.
patent: 4417269 (1983-11-01), Dischert
patent: 4425588 (1984-01-01), Baldwin
patent: 4605963 (1986-08-01), Reitmeier et al.
Devereux et al., Pulse-Code Modulation of Video Signals:Codes Specifically Designed for Pal, Proc. IEE, vol. 125, No. 6, Jun. 1978, pp. 591-8.
"Digital Frame Memory for Still Picture Television Receivers Pass Encoding System and Application", T. Yoshino et al., SMPTE Journal, vol. 89, pp. 257-262, Apr., 1980.

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