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This paper addresses the difficulty of extracting and/or verifying a watermark signal from watermarked image contained within poster. We consider a situation where an image owner tries to extract his/her embedded watermark from a camera-captured image having unauthorized image inside. This image normally contains rotation, scaling, and translation and perspective distortions from the processes of...
In this paper, we consider the problem of extracting the embedded watermark from the printed and scanned watermarked images. Since in a practical situation, the parameters settings in the printing and scanning processes between users are different, recovering the embedded watermark from the watermarked paper, after being scanned back to the computer, is difficult and contains high amount of errors...
In order to solve the pixel divergence problem brought by print and scan process, propose the algorithm that applying stretching contrast grade to adjust image pixel divergence. The parameter setting of this adjusting method uses peak signal noise ratio as standard of measurement, even though using different printer and scanner, we can also get good adjusting image. Simulation results show that the...
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