AND MANOJ THAKUR

Abstract: In this paper, a digital watermarking algorithm in discrete wavelet transform (DWT) domain for stereo image coding is presented. First, a disparity-image is computed from the pair of stereo images using a frequency domain based matching criteria. Later, this disparity-image is used as a watermark and embedded into the degraded host (left stereo) image based on a modifying singular values concept. The host image is degraded using Arnold transform. Finally, real coded genetic algorithm (RCGA) is used to estimate the optimal order of Arnold transform and the strength of watermark to fulfill the tasks of security, invisibility and robustness in proposed algorithm. In proposed algorithm, a legal user can retrieve the embedded watermark (disparity-image) and so able to recover 3-D information and right image of the stereo-pair. Experimental results are presented to evaluate the performance of proposed algorithm in terms of accuracy and robustness