【摘要】 本文提出了一种基于 3D DCT的彩色图象自适应水印算法 .证实了RGB彩色图象的 3D DCT比 2D DCT具有更好的能量汇聚性质并因此具有更大的感觉容量 ,从而允许嵌入更强的水印信号 .在此基础上 ,提出了利用人眼彩色视觉特性来自适应控制水印嵌入强度的方法 .实验证明该算法较好地平衡了隐形水印的不可见性和稳健性之间的矛盾 ,所隐藏的水印对常规性攻击 ,如JPEG压缩、加性噪声、图象滤波、彩色变化和亮度 /对比度变化等 ,具有很好的抵抗能力更多还原

【Abstract】 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 withstand under the common attacks,such as JPEG compression,additive noise,image filtering,color and luminance/contrast alteration very well.更多还原