Television gamma corrector with symmetrical response about black

Details Television gamma corrector with symmetrical response about black Television gamma corrector with symmetrical response about black

1982-09-27

1985-02-12

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, 358 41, H04N 520, H04N 907

Patent

active

044994940

ABSTRACT:
A television camera or other source of color-representative signals such as R, G and B includes a matrix to which the R, G and B signals are applied to form luminance (Y) and color-difference (I,Q) signals. The source and matrix are coupled together by way of a signal path having a particular response or transfer function for the R, G and B signals over their normal range. Unavoidable noise occurring in the signals near black level may perturb the color-representative signals, and causes color errors. The errors are reduced by arranging the coupling to have a response to negative noise peaks into the blacker-than-black region. The response outside this normal range is complementary to the response within the normal range. In a particular embodiment the coupling includes a gamma corrector which has complementary response in the blacker-than-black region.

REFERENCES:
patent: 3196205 (1965-07-01), Bedford
patent: 3845326 (1974-10-01), Godden
patent: 4202009 (1980-05-01), Ushiyama
patent: 4249208 (1981-02-01), Haenen
patent: 4415923 (1983-11-01), Noda
"Television Broadcasting", pp. 230-232, by Harold E. Emmes, Second Edition, First Printing 1979, by Howard W. Sams & Co.

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