Pre-processing filter apparatus for use in an image encoding sys

Details Pre-processing filter apparatus for use in an image encoding sys Pre-processing filter apparatus for use in an image encoding sys

1994-12-16

1996-02-13

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348608, H04N 521

Patent

active

054915198

ABSTRACT:
A novel pre-processing filter apparatus for use in an image encoding system, capable of adaptively filtering an input digital video signal, comprises a circuit for delaying a current frame of the input digital video signal by one frame interval; a circuit for generating a difference signal representing the difference between averaged pixel value for N.times.N pixels of the delayed previous frame and an averaged pixel value for N.times.N pixels of the current frame, at an identical area of the previous frame and the current frame; two or more filtering circuits arranged in parallel for filtering the input digital video signal, respectively, each of the filtering circuits having different cutoff frequencies; and a control circuit for generating one of the filtered digital video signals in response to the difference signal.

REFERENCES:
patent: 4754322 (1988-06-01), Okuda

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