Color gradation correction system of combination of looking-up table and interpolation and method thereof
US5479272A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Aug 13, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6019
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color correction system and method for correcting three kinds of color gradation input data, each having an m bit length, to produce three kinds of corrected color gradation data, each having an m bits length, by a combination of looking-up in a look-up table to find the closest color gradation corrected data and carrying out an interpolation to obtain improved color reproducibility. The system includes a first memory for storing previously calculated color gradation corrected data defined by a combination of upper n bits color gradation data (m>n); a second memory for storing previously obtained coordinate correction data defined by a combination of lower (m-n) bits color gradation data, and outputting first to third coordinate correction data; an adding unit for adding the upper n bits data of the first to third color gradation input data and the first to third coordinate correction data and outputting same to the first memory as a memory address thereof, to cause an output of the stored color gradation corrected data defined by the memory address; and an average calculating unit receiving the color gradation corrected data from the first memory and calculating averages of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.