Method of embedding color information in printed documents using watermarking
US6956958B2 · kind B2 · utility
7Cited by
13References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2002 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Nov 22, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3283
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for enhancing color fidelity in multi-reproduction, includes scanning an image to be reproduced, wherein the image contains an invisible digital watermark including color information; decoding the color information contained in the watermark; comparing the decoded color information with the scanned image; generating a correction table from the differences between the decoded color information and the scanned image; and performing color correction on the scanned image using the correction table. This method confines the color error to one generation, even when copies go through multiple reproduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.