Method and apparatus for transforming a source image to an output image
US6002795A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1997 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Jun 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention is a method and apparatus for computing color transformations of source images. It performs color transformations using a lookup table and a hashing block for referencing entries in the lookup table. The index generated by the hashing block is dependent on a first color value. A color encoding block is coupled to the lookup table for generating an encoded color value dependent on the first color value. The index produced by the hashing block is further dependent upon response characteristics of the human eye. The hashing block generates indexes referencing widely separated entries in the plurality of entries of the lookup table when first color values have small differences in value. A comparing block is coupled to the lookup table and the color encoding block for comparing the entry of the lookup table and the encoded color value to determine a match. A color calculation block is coupled to the lookup table for generating a second color value dependent on the first color value. The color calculation block generates the second color value when a match does not occur. The second color value is also stored in the entry of the lookup table. When a match does occu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.