System and method of adding a watermark to a JPEG image file
US8989432B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Mar 30, 2012 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Jan 25, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/0035
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A plurality of signature bits to be used to generate a watermark in a JPEG image file is determined, wherein the JPEG image file comprises at least one quantization table. A plurality of locations in the at least one quantization table is selected. A respective value associated with each of the selected plurality of locations in the at least one quantization table is changed, based on the plurality of signature bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.