Embedding watermark into halftone image with low distortion using parity values for overlapping groups of candidate sites
US7986441B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Apr 2, 2008 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | May 9, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
System and methodologies are provided herein for low-distortion image watermarking. Parity relationships between multiple pixels and/or regions of an image can be leveraged as described herein to reduce the amount of toggling required to embed a watermark in an image, thereby increasing watermark efficiency and reducing visual artifacts introduced in a watermarked image. Various algorithms for leveraging parity relationships are described herein, including a Block-Overlapping Parity Check (BOPC) algorithm, a Champagne Pyramid Parity Check (CPPC) algorithm, and a Tree-Based Parity Check (TBPC) algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.