离散小波变换不但能够更好地适合人眼视觉系统的特性, 并对于JPEG2000和MPEG4压缩标准比较能够较好的适应。通过小波变换进行嵌入水印信息得到的载体图像对于人眼视觉效果都比较良好, 并且载体图像中的水印信息具有较强的抵御力, 所以基于小波的数字水印技术研究对于目前现状有着重要的意义。使用一种基于小波变换的数字水印技术, 将低频子图分块并量化其小波系数, 采用Arnold置乱算法将水印嵌入到目标图像中并且可以从目标图像中完整地提取出水印, 最后可以通过对水印信息进行常见的水印攻击, 说明小波变换中的Arnold置乱算法的鲁棒性比较好。

Discrete wavelet transform is not only better suited to the characteristics of human visual system, but also better adapted to JPEG2000 and MPEG4 compression standards. The carrier image obtained by embedding watermarking information into the carrier image by wavelet transform has good visual effect for human eyes, and the watermarking information in the carrier image has strong resistance, so the research of the digital watermarking technology based on wavelet is of great significance to current situation. Using a digital watermarking technology based on wavelet transform, the low-frequency subgraph is divided into blocks and its wavelet coefficients are quantified. The Arnold scrambling algorithm is used to embed the watermarking into the target image and extract the watermarking completely from the target image. And the robustness of the Arnold scrambling algorithm in the wavelet transform is demonstrated by common watermarking attacking on the watermarking information.