Watermarking of image data using MPEG/JPEG coefficients
US6069914A · kind A · utility
262Cited by
11References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 19, 1996 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Sep 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91335
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A watermark is embedded into video/image/multimedia data using spread spectrum methodology. The watermark is extracted from watermarked data without the use of an original or unwatermarked version of the data by using MPEG/JPEG coefficients. The image to be watermarked is divided into subimages. Each subimage is embedded with a watermark. When extracting the watermark, the result from each subimage is combined to determine the originally embedded watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.