Method and apparatus for effecting dynamic color shift in a tele

Details Method and apparatus for effecting dynamic color shift in a tele Method and apparatus for effecting dynamic color shift in a tele

1994-06-22

1996-03-12

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance signal amplitude control

348655, 348656, H04N 973, H04N 964

Patent

active

054990599

ABSTRACT:
A method and circuit for correcting color errors in displaying a color video signal on the display of a color television receiver, the color television receiver having drive circuits for each of the colors red, green and blue, for forming respective color drive signals, in response to color signal components present in the color video signal, for the display, the method including setting up the color drive circuits of the color television receiver for conversion of the color signal components in the color video signal to the color drive signals to a ratio for producing a white color temperature higher than that specified in a television standard, detecting the presence and amount of color in the color video signal to be displayed on the display of the color television receiver, and reducing the color drive signals for at least two of the colors in dependence on the detected amount of color in the color video signal, whereby the resulting chromaticity of the displayed colors is the same as that when the color drive circuits are set up for the standard white color temperature, while displayed white regions are at the higher than standard color temperature.

REFERENCES:
patent: 4633299 (1986-12-01), Tanaka et al.
patent: 4694330 (1987-09-01), Tanaka et al.
patent: 4754321 (1988-06-01), Srivastava
patent: 5134465 (1992-07-01), Ohki et al.
patent: 5333019 (1994-07-01), Okamoto
patent: 5345275 (1994-09-01), Lendaro

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