基于改进零树小波的红外图像盲水印算法

提出了一种小波域自适应盲水印算法,采用（7,4）汉明码技术进行纠错编码。基于整数小波变换,在中高频区采用不重复零树小波编码,自适应的量化小波系数,将水印嵌入到重要系数上。水印提取过程不需要原始图像的参与。实验结果表明,算法自适应性强,实现速度快,具有较好的不可见性,对常见的JPEG压缩、滤波、加噪、剪切等攻击具有较强的鲁棒性。

A Blind Image Watermark Algorithm Based on Improved Zerotree Wavelet

An adaptive watermark algorithm in wavelet domain is proposed and the hamming code is used to correct the wrong code.The whole process is based on integer wavelet transform,coding the significant coefficients which have un-scanned in intermediate frequency sub-band,and adaptively quantizing wavelet coefficients.The watermark is embedded in the perceptually important coefficients.The watermark can be detected without resorting to the original image.Experimental results show that the algorithm proposed has the characteristics of strong adaptability,fast implementation,better invisibility and strong robustness against attack such as JPEG compression,filter,noise addition and cropping.