Input scanner color mapping and input/output color gamut transformation
US5185661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1991 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Sep 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An input scanner and print engine system corrects for color interpretation errors in the input scanner's color filter set and maps the requested input colors to an output color printable by the printer in a uniform color space. A 3.times.3 transform matrix partially corrects for the color interpretation errors of the color filter set as well as maintaining the neutrality in the transformation and a non-linearly loaded lookup table further corrects the color interpretation errors for outlying datapoints in the actual color space. A color gamut compression lookup table is used to perform non-linear compression for each axis of the color space. Inside the output color gamut, a substantially one-to-one correspondence is performed by the compression table but near the outer color gamut boundary, compression is non-linearly performed. In this manner, colors lying outside of the printable output color gamut are compressed to a region within or on the surface color of the printable color gamut.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.