Noise reduction apparatus for video signal

Details Noise reduction apparatus for video signal Noise reduction apparatus for video signal

1987-11-10

1989-04-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, 358340, H04N 521

Patent

active

048252891

ABSTRACT:
A noise reduction apparatus includes a vertical filter for extracting a component having a high vertical frequency from an input video signal, a two-dimensional filter for extracting a component having a low vertical frequency and a high horizontal frequency from the input video signal, a detector for detecting a vertical line image portion from output components of the vertical filter and the two-dimensional filter, and a controllable two-dimensional filter which suppresses a component having a high vertical frequency at the vertical line image portion according to a detection signal from the dector. By this apparatus, the noise superposed on the vertical line image signal is effectively reduced without deteriorating the vertical resolution.

REFERENCES:
patent: 4009334 (1977-02-01), Sypula
patent: 4015076 (1977-03-01), Ishiodori
patent: 4058836 (1977-11-01), Drewery et al.
patent: 4302768 (1981-11-01), Kamura et al.
patent: 4562470 (1985-12-01), Dinh et al.
patent: 4652922 (1987-03-01), Ozaki
patent: 4706113 (1987-11-01), Ito et al.

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