Method and system of watermarking digital data using scaled bin encoding and maximum likelihood decoding
US6721439B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2000 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Mar 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transform domain watermarking technique which is based on a new encoding scheme referred to as scaled bin encoding which encodes a message in a set of transform coefficients by modifying their values in a way that preserves high image quality (i.e., low distortion levels) and adapts to expected noise level. Recapturing of the watermark image is performed via a decoding method using a maximum likelihood procedure (i.e., maximum likelihood decoding), based on the statistics of the transform coefficients and a worst case statistical model of the noise introduced to these coefficients by image processing operations or attack noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.