Method and apparatus for measuring noise in video signals

Details Method and apparatus for measuring noise in video signals Method and apparatus for measuring noise in video signals

1993-03-22

1995-02-07

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348180, H04N 5213

Patent

active

053879465

ABSTRACT:
A method of measuring noise in a television signal includes the steps of storing an estimated noise value N. The activity values A of blocks of pixels are measured and periodically compared with the estimated noise value N. A first correction value C.sub.v1 is added to the estimated value when A>N and a second correction value C.sub.v2 is subtracted from the noise value N when A.ltoreq.N. The second correction value C.sub.v2 is substantially greater than the first correction value C.sub.v1.

REFERENCES:
patent: 4074201 (1978-02-01), Lennon
patent: 4249209 (1981-02-01), Storey
patent: 4442454 (1984-04-01), Powell
patent: 4873574 (1989-10-01), Darby
patent: 5161018 (1992-11-01), Matsunaga

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