Embedding data in material
US7085396B2 · kind B2 · utility
28Cited by
26References
57Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2001 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Nov 17, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0203
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spatial domain using image produced by a source is combined with watermark data Ri to produce a spatial domain watermarked image. The watermarked image is produced by an embedder according to equation: Ci′=Ci+α. Ri, where Ci and Ci′ are wavelet transform coefficients of the image, and α is a scaling factor. α is chosen so that the watermark is imperceptible in the image and to resist removal of the watermark by unauthorized processing. It is desirable that a has the smallest value which achieves that. If α is too big the watermark is perceptible in the image. If α is too small the mark may not survive processing of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.