Method for embedding watermark into an image and digital video recorder using said method
US7707422B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 22, 2004 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Nov 18, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method for embedding and detecting a watermark where a forgery/alternation of an image can be identified and the location of forgery/alternation can be verified by embedding and detecting a watermark into a digital image which is shot in real time. The watermark is generated by using a quantized coefficient after frequency transform used in the compression process. By embedding this into an image, the image can be compressed simultaneously with the embedded watermark. The present invention relates to a method for embedding a robust watermark which embeds a random sequence circular shifted from an original pseudo random sequence by the distance d as the watermark is embedded into an image, and a method for generating and embedding the watermark by using a DCT coefficient quantized during an MPEG compression process of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.