A Pyramid-Based Watermarking Technique for Digital Images Ownership Verification
نویسنده
چکیده
This paper proposes a pyramid-wavelet watermarking scheme for ownership verification of digital images. The discrete wavelet transform (DWT) has been used extensively in recent years in watermarking systems. It provides the necessary perceptual invisibility and robustness. In this paper, a pre-DWT process is implemented using optimal pyramid transform (OPT), where one of the error images that are resulted from the pyramid transform is decomposed using DWT, and a watermark is inserted in one of its subbands. Then, the watermarked image is reconstructed. The filters used for OPT and DWT decompositions are randomly generated to increase the security of this algorithm. The simulation results show that the proposed algorithm achieves a saving of 54% in the computational complexity. When the median filter attack is used, the correlation will be on the average of 47.9% higher than earlier published algorithms.
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