2007 Fiscal Year Final Research Report Summary
Picture Watermarks Immune to Geometrical Transformation
| Project/Area Number |
18500075
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Media informatics/Database
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
YOSHIURA Hiroshi The University of Electro-Communications, Faculty of Electro-Communications, Professor (40361828)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Digital Rights Protection / Content Protection / Algorithm / Digital Watermark |
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| Research Abstract |
Survivability to geometric transformations, i. e., precise detection of embedded information from images that were watermarked and then transformed, is an important technical requirement for still and motion picture watermarks. Representative geometric transformations include "random distortion" that gives small irregular distortion in each parts of an image and "affine transformation" such as scaling and rotation. No previous methods can treat both of these two types.
In this research, we proposed to embed 1 or 0 information into a color image by adding the same or reverse pattern onto two constituent planes of the image. The proposed method detects 1 or 0 information based on the sign of the correlation between the two constituent planes. This method can detect the embedded information because any geometric distortion of the image gives the same distortion to the two constituent planes and thus their correlation does not change.
In addition to this basic proposal, we further proposed, implemented, and evaluated various improvements including prevention of image-quality degradation, improvement of detection reliability, and multi-bit embedding.
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Research Products
(24 results)
