小波包和多小波图像数字水印的研究与比较

介绍了小波包和多小波两种数字水印技术，比较了二者的应用特点和优越性，并对不同的图像进行了试验和对比研究。结果表明，在宿主图像、水印的嵌入位置和对水印的攻击类型相同的条件下，多小波水印在图像增强、添加噪声和滤波的攻击实验中抵抗能力要好于小波包。而基于最优基的小波包水印能够更好地抵抗剪切、JPEG压缩和马赛克等操作，具有更好的自适应性，并且从实用价值来看，小波包水印方案更易于操作，实用性更强。

Study and Comparison of Image Watermark Based on Wavelet Packet and Multi-wavelet

Image watermark based on wavelet packet and multi-wavelet is researched and compared here. Different images are used in the experiment and the result is studied comparatively. These results appear that under the same conditions such as the primary image, the position of watermark and the styles of attacks, image watermark based on multi-wavelet is better in attacks such as noise, filtering, and image swelling. While wavelet packet is more robust, it can better adapt the image than multi-wavelet, especially in the attacks of cut and JPEG compressing. Moreover, wavelet packer watermark is realized simply and it is more practical.