Method and apparatus for correcting color reproduction

Details Method and apparatus for correcting color reproduction Method and apparatus for correcting color reproduction

1992-12-10

1994-06-07

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance signal amplitude control

348649, H04N 964

Patent

active

053194489

ABSTRACT:
A method and an apparatus for correcting a color reproduction distortion for each of all the hues are provided. A predetermined demodulating axis of three demodulating axes SR, SG and SB for the three primary colors R, G and B, herein, the R-Y demodulating axis SR is formed by combining the two demodulating axes SR2 and SR3. The demodulating axis SR2 provides a different demodulating gain from the standard demodulating axis. The demodulating axis SR3 provides a different demodulating angle from the standard demodulating axis in addition to the different demodulating gain. Then, a smaller one of the signals demodulated by the demodulating axes SR2 and SR3 is selected. It means that the signal changing along the vector orbit E1 indicated by oblique lines is made to be a color difference signal R-Y. By this function, from the signals demodulated about the demodulating axes SR2 and SR3, the portions with no color reproduction distortion are extracted and synthesized so that no color reproduction distortion takes place with respect to all the hues.

REFERENCES:
patent: 4167750 (1979-09-01), Tomimoto et al.
patent: 4306247 (1981-12-01), Tomimoto et al.
patent: 4544944 (1985-10-01), Chin
patent: 4553157 (1985-11-01), Hurst, Jr. et al.
patent: 5134465 (1992-07-01), Ohki et al.

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