Method of effecting gradation and color correction of a composite image
US5042078A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1988 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Aug 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2215/0094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.