Noise reducer using magnitude of noise and non-linear signal pro

Details Noise reducer using magnitude of noise and non-linear signal pro Noise reducer using magnitude of noise and non-linear signal pro

1987-05-19

1989-01-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 5213

Patent

active

047960884

ABSTRACT:
A level difference detecting circuit 9 and an integrating circuit 10 receive a digital image signal inputted from an image signal input terminal 1 and detect a magnitude during a constant level period in every field. A determining circuit 12 determines the magnitude of the detected noise and selects the kind of a non-linear parameters to be used in a digital filter 8. Therefore, the digital filter 8 always performs processing for reducing noise by the most suitable non-linear parameter in accordance with the magnitude of noise.

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"Digital Signal Processing", Daily Industrial News, May 25, 1981, pp. 115-118.

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