一种基于面分解的小波域鲁棒水印算法

A Hight Robust Gray Level Watermarking Sheme with bit Plane Coding base on the DWT Domain

随着因特网和数字技术的发展,数字水印技术作为版权保护的重要手段,得到广泛的研究和应用.然而,以灰度图像作为水印信息的嵌入并不算多,针对这种情况,本文提出一种以灰度图像作为水印的小波域水印算法,即对灰度水印图像进行面分解,选择高四位进行(7,4)海明码纠错,结合分型编码理论对低四位进行4×4分块,选择某一小块与其他小块均方误差和最小的小块进行海明码纠错后与高四位的纠错码一起结合人类视觉特性(hu-m an visualmodel,HVS)嵌入到宿主图像小波变换的系数中,并通过实验仿真证明本算法具有极强的鲁棒性.

The digital media has become a main way for information communication along with the popularization of Internet and the development of multimedia techniques. As a main method for copyright protection, the techniques of watermarking have been widely studied and applied. But the use of the Gray-level image as a watermarking is uncommon. Considering this condition, the paper proposes a algorithm based on the DWT and bit-plane coding. The algorithm encode the gray-level image with bit-plane coding and intercept the high four bit value error corrected by（7,4） hamming code as a majority party of watermark. The low four bit value using the classified code theory to take the sub-block with the minimum mean square error and error corrected as the other party of the watermark. Experimentes prove that the algorithm can resulted in a good robust.