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Secured Watermarking in DCT Domain using CRT and Complexity Analysis

Digital watermarking techniques have been used as one of the means for copy right protection and authentication of multimedia data. This paper present a secured watermarking method based on image complexity analysis with Chinese Remainder Theorem (CRT). The image complexion information is extracted from DC coefficient in sub blocks transformed by discrete cosine transform (DCT) to make sure macroblock of image adapt to be embedded watermark information [5]. In the proposed watermarking technique the security enhanced without degrading the image quality. Simulation result show the proposed watermarking algorithm has strong robustness against some attacks such as JPEG compression, noise attacks, cropping, tampering and so on [4].