Frequency-modulated watermarking
US9111340B2 · kind B2 · utility
0Cited by
3References
8Claims
0Family size
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Key dates
| Filing date | Nov 29, 2011 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | May 23, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0051
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for image processing includes storing a data string and applying a background modulation to an image. The modulation includes a periodic spatial pattern of chromatic variations over an area of the image with a constant luminance over the area and with a spatial frequency of the chromatic variations that encodes the data string. Related apparatus and methods are included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.