Electronic watermarking system capable of providing image data with high secrecy
US6456724B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1999 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0081
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an electronic watermarking device for inserting an electronic watermark into an original image, discrete cosine transformer carries out discrete cosine transform of a partial block of the original image, inserting unit inserts electronic watermarking data into an output of the discrete cosine transformer, inverse discrete cosine transformer carries out inverse discrete cosine transform of an output of the inserting unit, and coordinate converter which has coordinate conversion data carries out coordinate conversion of an output of the inverse discrete cosine transformer by the electronic watermarking data and the coordinate conversion data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.