Knee correction

Details Knee correction Knee correction

1995-04-14

1998-03-17

Lee, Michael H.

Television

Image signal processing circuitry specific to television

Hue control

348645, 348679, 348256, H04N 964

Patent

active

057292990

ABSTRACT:
A knee circuit in which the hue on the output side does not differ from the hue on the input side. The knee circuit includes a virtual luminance signal generator for generating a virtual luminance signal Y based on at least one input color signal Rin, Gin and Bin, a virtual correction value generator for monitoring whether the virtual luminance signal Y is equal to or greater than a knee point NP and for generating a virtual correction value Yk by performing a knee correction with respect to the virtual luminance signal Y when it is equal to or greater than the knee point NP. A proportional value generator generates a proportional value Kk showing a ratio of the virtual correction value Yk to the virtual luminance signal Y by dividing the virtual correction value Yk by the virtual luminance signal Y. A correction color signal generator multiplies each of the input color signals Rin, Gin and Bin by the proportional value and outputs a multiplication result as corrected color signals Rout, Gout and Bout, that is, color signals on which knee correction has been performed.

REFERENCES:
patent: 3950779 (1976-04-01), Suenaga
patent: 4499486 (1985-02-01), Favreau et al.
patent: 4639299 (1987-01-01), Tanaka
patent: 4679072 (1987-07-01), Takayama
patent: 4712132 (1987-12-01), Soca

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