Method and apparatus for electronic image color modification usi

Details Method and apparatus for electronic image color modification usi Method and apparatus for electronic image color modification usi

1994-10-25

1995-09-19

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Chrominance signal amplitude control

348651, 348703, 358520, H04N 964

Patent

active

054520177

ABSTRACT:
The color modification system receives standard red, green and blue signal values and outputs modified red, green and blue values in accordance with operator modification of the signals. To increase processing speed and minimize the amount of required memory while also maintaining high resolution, the system converts the input red, green and blue signals to two-component hue and saturation values for modification using look-up tables. Once the hue and saturation levels of the signals are modified, red, green and blue output signals are reconstructed using the modified hue and saturation values, as well as a calculated brightness value. In this manner, modification of three-component primary-color signals is achieved by manipulating only two-component hue and saturation values. The system also allows modification of the brightness level of each component of the video signal in accordance with operator control. Novel methods for the determination of hue and saturation are disclosed.

REFERENCES:
patent: 4183046 (1980-01-01), Dalke et al.
patent: 4951127 (1990-08-01), Mehrgardt et al.
patent: 5089882 (1992-02-01), Kaye et al.
patent: 5134465 (1992-07-01), Ohki et al.
patent: 5202935 (1993-04-01), Kanamori et al.
patent: 5204948 (1993-04-01), Kato

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