Method for inconspicuously adding tracking data in coded images
US6640005B1 · kind B1 · utility
11Cited by
11References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1999 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Oct 21, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0061
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method embeds tracking data into image graphics data that represents the image according to a first colorspace. The tracking data is embedded during encoding in black or white locations of the image, as variations of the chrominance coefficients. When the resulting data is converted into a second color space, the user tracking data does not alter the eventual visual image. Decoding methods are also provided for extracting the tracking data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.