一种基于Bandelet变换的数字图像水印算法

A digital image watermarking algorithm based on Bandelet transform

提出一种基于第二代Bandelet变换的数字水印算法.该算法分别将原始图像和水印图像进行Bandelet变换,通过先对原始图像的Bandelet系数做预处理,按照水印嵌入加法准则,将水印信息的Bandelet系数嵌入到原始图像的重要系数上,达到对系数的改变以实现水印的嵌入.实验结果表明:该算法与基于小波变换的算法相比,经剪切、中值滤波、加噪和JPEG压缩等攻击后仍具有良好的鲁棒性.

A digital watermarking algorithm based on second generation Bandelet transform is presented.The method imposes Bandelet transform on original image and watermarking image.The embedding of watermarking is realized by pre-processing Bandelet coefficients of original image and embedding that of watermarking information on them via embedding addition rule.Experimental results show that the algorithm is better than wavelet-based,which are reflected in resisting various attacks robustly,for example,cutting,median filter,plus noise and JPEG compression.