Noise adjusted recursive filter

Details Noise adjusted recursive filter Noise adjusted recursive filter

1986-04-11

1988-02-02

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 5213

Patent

active

047231661

ABSTRACT:
A noise adjusted recursive filtering apparatus is presented for use in processing video signals having picture portions and predetermined nonpicture portions. A noise detector responds to video signals during a nonpicture portion for providing a noise signal having a magnitude representative of the average noise level on the video signal. A recursive filter is provided for filtering the video signal and this filter includes a delay for delaying the input video signal together with circuitry for determining the difference between a present input video signal and a delayed video signal. The difference signal as well as the noise level signal are employed for purposes of providing a correction signal which is added to the input signal to provide an output video signal. The correction signal is a nonlinearly related percentage of the difference signal and varies as a function of the difference signal and the noise level signal.

REFERENCES:
patent: 4064530 (1977-12-01), Kaiser
patent: 4249210 (1981-02-01), Storey
patent: 4296436 (1981-10-01), Achiha
patent: 4367490 (1983-01-01), Riederer

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