Stereo Image Reversible Watermarking

نویسنده

  • J. N. Ellinas
چکیده

In this paper, a new reversible watermarking method is presented that reduces the size of a stereoscopic image pair while keeping its content visible. The proposed technique embeds the disparity compensated difference and the disparity vectors of the stereo pair into the reference image, halving its total capacity. The residual is usually lossy compressed before embedding because the embedding bit rate of the reference image is not high enough. The watermarked image is visible at a high quality and at any instant the stereo pair may be recovered by an inverse process. In fact, the reference image may be exactly recovered whereas the target image is slightly distorted as the residual is not embedded intact. The embedding capacity of the reference image and the quality of the watermarked image are contradictory and depend on the image content as well as the effectiveness of the embedding algorithm. The employed embedding method reorders the reference image into an array of consecutive pixel pairs and embeds a number of bits according to the intensity difference of each pair. In this way, it hides a number of bits in intensity smooth areas and most of the data in textured areas where resulting distortions are less visible. The effect of different traversal schemes on the performance of the embedding algorithm is also examined and an approximate method is suggested in order to select the most suitable scheme for embedding capacity enhancement.

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تاریخ انتشار 2008