Circuits for reducing noise in a video signal

Details Circuits for reducing noise in a video signal Circuits for reducing noise in a video signal

1990-09-05

1992-04-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358340, H04N 5208

Patent

active

051052741

ABSTRACT:
A first circuit includes a high pass filter for extracting a high band signal component of an incoming video signal and a limiter for amplitude-limiting an output signal of the high-pass filter. A second circuit detects correlation in the vertical direction of the video signal and a weighting circuit weights an output signal of the second circuit in response to the output signal of the high-pass filter. An adding circuits adds an output signal of the first circuit and a weighted output signal of the second circuit, and subtracting circuit subtracts an outptut signal of the adding circuit and the video signal from each other, in order to reduce the noise in the incoming video signal. In this manner, noise remaining at the edge portion of a video image signal can be removed effectively.

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