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A Geometric Compensation Method for Image Watermarking Schemes and Its Required Accuracy
Shouhei KAMIMURA,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a geometric compensation method for improving the watermark extraction ability. The proposed method is independent of watermarking schemes, whereas the conventional approach makes the particular watermarking scheme resistant to geometric deformation. The proposed method estimates geometric parameters by phase-only correlation technique using the original image rather than the stego image in which watermark is hidden. The required accuracy for geometric estimation is investigated by computer simulation, and performances are evaluated using real printed-and-scanned images.