Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
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
Daewoo Electronics Co. Ltd.
Groody James J.
Hsia Sherrie
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