In this paper,an adaptive color image-watermarking algorithm based on 3D-DCT(Three Dimensional-Discrete Cosine Transform) is proposed.The algorithm demonstrates that 3D-DCT outperforms 2D-DCT in terms of energy concentration.Since the 3D-DCT coefficients of a color image have larger magnitudes than that of the 2D-DCT coefficients,the 3D-DCT coefficients have larger perceptual capacity and then allow to embed stronger watermark signal.Based on 3D-DCT,we propose to change the watermark strength adaptively by taking account of the perceptual feature of human visual system.The experimental results show that the proposed algorithm can trade-off the conflict of transparency and robustness of invisible watermark well,the thus generated watermark can with-stand under the common attacks,such as JPEG compression,additive noise,image filtering,color and luminance/contrast alteration very well.
Key words
color image watermarking /
3D-DCT /
color visual characteristic /
adaptive watermarking /
robustness
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References
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