Method and apparatus for processing color values
US5349451A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Oct 28, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/3935
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and an apparatus for processing color values in the reproduction of color originals. Color values (R.sub.0, G.sub.0, B.sub.0) of original pixels (P.sub.0) arranged in an original raster network are acquired by pixel-by-pixel and line-by-line, optoelectronic scanning of color originals. For modifying the reproduction scale, an output raster network is generated for output pixels (P.sub.A) to be reproduced, and the color values (R.sub.A, G.sub.A, B.sub.A) of the output pixels (P.sub.A) are respectively calculated from the color values (R.sub.0, G.sub.0, B.sub.0) of the original pixels (P.sub.0) within an interpolation window that is shiftable across the original raster network, being calculated by weighting the color values (R.sub.0, G.sub.0, B.sub.0) with previously calculated weighting coefficients (k.sub.M) and by addition of the weighted color values. A disturbing color offset arises when the color components of the original pixels (P.sub.0) are sequentially scanned in successive scan lines. In this case, a correction of the color offset is advantageously simultaneously implemented with the modification of the reproduction scale, being implemented with the assistance of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.