水印算法在彩色图像处理方面的应用研究

Exploration on the Application of Watermarking Algorithm in Color Image Processing

主要对DCT域彩色图像水印算法进行了改进.利用彩色图像的DCT系数排序之后的分布特征,将Barni关于DCT域彩色图像水印乘性算法转变为一种加性算法,并由此推导出一种非线性水印检测器,形成了一种鲁棒性强的水印算法,以期达到更高的检测率.实验证明这种改进的水印算法对于噪声、滤波、剪切等多种攻击具有较好的鲁棒性和更高的检测率.

This paper mainly focuses on some improvements for algorithm of the discrete cosine transformation （DCT）-domain images watermarking, we transform the classical multiplicative algorithm of Barni into an addi- tional one by using the distribution and thus derive a nonlinear watermark detector, form a strong robustness wa- termarking algorithm to achieve higher detection rate. Experiments prove that the improved watermarking algo- rithm has better robustness and higher detection rate for noise, filtering, cutting and other attacks.