Method of effecting gradation and color correction of a composit

Details Method of effecting gradation and color correction of a composit Method of effecting gradation and color correction of a composit

1988-08-20

1991-08-20

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

355 40, 358183, 358 80, G06K 940

Patent

active

050420780

ABSTRACT:
A method of making color and gradation correction performs color and gradation correction differently for a human subject image and a computer graphic image before or after composing these images. A gradation correction is carried out by the use of linear table data written in a look-up table for computer graphic images and non-linear table data for human subject images. A color correction circuit for transforming image data by the use of a matrix calculation comprises three look-up table memories and an adder for adding together outputs from the look-up table memories for each color to be color corrected. In these three look-up table memories, different table data are written in, according to the kinds of human subject image and computer graphic image. There are provided a plurality of different table data for human subject images and computer graphic images, respectively and suitable table data are selected according to a human subject image and a computer graphic image to be composed.

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patent: 4691365 (1987-09-01), Nayashima
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patent: 4860373 (1989-08-01), Hartlon et al.
patent: 4935879 (1990-06-01), Ueda
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