Interpolation filter and receiver provided with such an interpol

Details Interpolation filter and receiver provided with such an interpol Interpolation filter and receiver provided with such an interpol

1989-05-03

1990-06-12

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, H04N 521

Patent

active

049337661

ABSTRACT:
A simple and reliable interpolation filter can be provided by a median filter 9 to which signals of the pixels x.sub.1, x.sub.2 and x.sub.3 are applied and which can supply incorrect output values at high spatial frequencies perpendicular to a connection line of pixels x.sub.3 and x.sub.4 located diametrically with respect to a pixel (.) to be interpolated, in conjunction with an averaging circuit 25 to which signals of the pixels x.sub.3 and x.sub.4 are applied and which will not be disturbed at the said frequencies, but will cause disturbances at high spatial frequencies in the direction of this connection line x.sub.3 -x.sub.4, at which last-mentioned frequencies the median filter 9 will function correctly again.

REFERENCES:
patent: 4334244 (1982-06-01), Chan
patent: 4682230 (1987-07-01), Perlman
patent: 4723163 (1988-02-01), Skinner

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