Color adjustment apparatus for automatically changing colors

Details Color adjustment apparatus for automatically changing colors Color adjustment apparatus for automatically changing colors

1993-08-24

1995-01-24

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Selective image modification

348652, 348647, 358520, H04N 964

Patent

active

053846010

ABSTRACT:
An automatic color adjustment apparatus for use in an imaging device for adjusting the color of a subject such as skin or leave, which is well retained in human memory, to be as natural as possible. The color adjustment apparatus has a weighting coefficient setting device for setting a weighting coefficient according to the difference between the input chromaticity value and the preselected reference chromaticity value set by a chromaticity value setting device. The preselected reference chromaticity value is selected, with respect to a particular subject, such as skin, to be equal to the most natural color of that subject in a chromaticity plane defined by hue and saturation characteristics. The color-adjusted output signal is produced from a calculator which calculates an internal division operation applied to the preselected reference chromaticity value and the input chromaticity signal using the weighting coefficient.

REFERENCES:
patent: 4763186 (1988-08-01), Belmares-Sarabia
patent: 4812903 (1989-03-01), Wagensonner
patent: 4831434 (1989-05-01), Fuchsberger
Gazou-Denshi-Gakkai-shi (The Journal of the Institute of Electronic Imaging Engineers), vol. 18, No. 5, pp. 302-311.

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