模糊自适应的彩色图像数字水印算法*

提出了一种基于离散余弦变换 (DCT)域的模糊自适应彩色图像水印算法.采用YUV彩色空间,以人类视觉系统(HVS)为基础,结合原始图像的特点,设计了模糊控制器,建立了合理的模糊规则,将水印信号以不同强度嵌入到彩色图像的Y、U、V分量的DCT系数中,实现了水印的自适应嵌入以及水印强度的动态调度.实验结果表明,该算法不仅具有很好的不可感知性,而且对剪切、滤波、噪声等攻击均具有较好的鲁棒性.

Fuzzy adaptive color image watermarking algorithm

A fuzzy adaptive watermarking algorithm of color image based on discrete cosine transform (DCT)domain was proposed. By adopting YUV color space and considering the properties of the original image, a fuzzy controller was designed, and reasonable rules of fuzzy controller were established based on human visual system (HVS). The different strength of watermarks were embedded into the DCT coefficients of the luminance Y,the hue U and the saturation V of the color image. It achieved the watermark adapting to the image itself entirely and the dynamic control of the strength of embedded watermarks. The experimental results show that the proposed watermarking algorithm is invisible and robust against various signal processing such as cropping, filtering,noise.