Method for adjusting the luminance of a color signal

Details Method for adjusting the luminance of a color signal Method for adjusting the luminance of a color signal

1992-05-19

1995-03-14

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Brightness control

348712, H04N 557

Patent

active

053980778

ABSTRACT:
A luminance signal is formed from an original color signal and is used to determine a new luminance. The original color signal is then adjusted to have the new luminance in a way that does not change the hue or saturation of the original color. The method is embodied in an analog or a digital circuit and in the alternate may be may be emulated in a general purpose computer. The method permits a change in color signals which affect the overall brightness only in a non-linear way, while adding only a small amount of additional hardware or computation to implement the invention.

REFERENCES:
patent: 4712132 (1987-12-01), Soca
patent: 4835599 (1989-05-01), Sigel
patent: 4876599 (1989-10-01), Kihara
patent: 4963948 (1990-10-01), Ueda et al.
patent: 5045933 (1991-09-01), Tatsumi
patent: 5176528 (1993-01-01), Robertson et al.

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