Digital watermark embedding method, digital watermark embedding apparatus, and storage medium storing a digital watermark embedding program
US7164778B1 · kind B1 · utility
46Cited by
4References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 18, 1999 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Nov 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for embedding a watermark into a digital image. The method includes independently changing real number components and imaginary number components of each of coefficient values of a complex watermark coefficient matrix using a key, from the watermark to be embedded in the digital image. The method further includes a step for performing a discrete Fourier inverse transform on the sequence matrix of the changed watermark and generating a watermark pattern. The method also includes a step for adding like tiling the water mark pattern to the original image, and generating an embedded image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.