Q. Zhang*, Y. Li, X. Wei

Key Laboratory of Advanced Design and Intelligent Computing (Dalian University) of Ministry of Education, Dalian, Liaoning 116622 *E-mail: zhangq@dlu. edu.cn

ABSTRACT

This paper proposes an improved watermarking algorithm based on DCT (Discrete Cosine Transform). We carried out the algorithm as described as follows. First, we extended both rows and ranks of the watermark by using the proposed method before the embedding stage. After expansion, Sine chaotic system is employed in encrypting the watermark. In the embedding stage, an effective and adaptive embedding method is proposed to embed the watermark into the blocked DCT coefficients. Experimental results demonstrate that the proposed algorithm in this paperworks well in resisting both geometry attack and noise attack. It also does well in recovering the watermark after stego image suffered from JPG compression.

Keywords: Watermark, DCT, chaotic, adaptive, robustness.

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Acknowledgment

The work was supported by the National High Technology Research and Development Program ("863" Program) of China (No. 2009AA01Z416), the National Natural Science Foundation of China (31170797, 30870573), Program for Changjiang Scholars and Innovative Research Team in University (No.lRT1109), the Program for Liaoning Innovative Research Team in University (No. LT2011018), the Program for Liaoning Excellent Talents in University (No. LR201003), the Program for Liaoning Innovative Research Team in University (No. LT2011018) and by the Program for Liaoning Science and Technology Research in University (No. LS2010179).

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