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9 April 1999 Recovering modified watermarked images with reference to the original image
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While most researchers are focusing on how to develop a robust and imperceptible watermarking technology, in this paper, we would stress a little in error analysis on recovering modified (attacked) watermarked images with reference to their original images. Here 'recovering' means that firstly we must find out the modification parameters of these images and then transform them back with maximum similar to the original images. We argue that correctly and accurately estimating the transform parameters of the modified watermarked images based on the given original image or some invariant parameters extracted from original image is very useful, helpful even essential for watermarking detection and verification. In this paper, firstly we will briefly introduce several basic image registration techniques. Then we evaluate the availability and limits of which they are directly used for recovering modified watermarked images considering some common attacks on image watermark. Furthermore we propose a method of estimating the transform parameters of modified watermarked image with reference to original image (Or its invariant feature parameters), and then analysis the recovering errors based on the proposed method. After reviewing several typical image watermarking schemes and systems based on different purposes, we outline some quantities for each system in condition that the embedded watermark could be extracted without error. We believe that a slight modification version of the proposed method could be used as a module of image authentication.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Qibin Sun, Jiankang Wu, and Robert Deng "Recovering modified watermarked images with reference to the original image", Proc. SPIE 3657, Security and Watermarking of Multimedia Contents, (9 April 1999);


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