基于DCT的自适应盲数字水印

Adaptive Blind Watermarking Based on DCT

针对一般数字水印算法对于水印不可感知性和鲁棒性无法达到较好平衡的问题,提出了一种改进的DCT的自适应盲数字水印。嵌入水印的时候,根据云图的纹理和暗影特征,结合人类视觉系统(HVS),DCT块的DC分量利用奇偶量化法嵌入水印,AC分量利用确定固定系数法嵌入水印;提取水印的时候,利用盲检测方法。实验结果表明,提出的自适应盲数字水印不仅对常见的高斯噪声、椒盐噪声攻击具有很好的鲁棒性,而且较好地满足了水印的不可见性,同时减少了水印的嵌入和提取时间。

Aiming at the problem that the imperceptibility and robustness of the general digital watermarking algorithm can not reach better balance, this paper put forward an improved DCT adaptive blind digital watermarking. When em- bedding watermark,we used the odd-even quantization method to embed the watermark in DC component of the DCT block and used the fixed coefficient method to embed the watermark in AC components according to the texture and shadow character in the cloud chart and human visual system （HVS）. The experimental results show that the adaptive blind digital watermarking proposed in this paper not only has good robustness for the Gauss noise, common salt and pepper noise attack,and also better meets the invisibility of watermark,, while reducing the watermark embedding and extraction time.