Watermark coding method and recording medium thereof
US7620198B2 · kind B2 · utility
0Cited by
5References
13Claims
0Family size
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Key dates
| Filing date | Jul 1, 2004 |
| Grant date | Nov 17, 2009 |
| Priority date | — |
| Expiry date | Dec 22, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0083
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A watermark coding method and its recording medium utilize image interleaving and wavelet-based transformation to enhance the robustness of the image. The watermark series to be inserted is converted, encrypted, and modulated to increase the difficulty in decoding and restoring. Finally, the watermark is distributed and hidden in various frequency bands of the image in a frequency hopping way, generating a robust watermarked image. When used in a recording medium, side information produced during coding is recorded in the lead-in area of the recording medium to reduce the chances of illegal copying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.