一种基于离散小波变换的数字水印技术

提出了在一种离散小波变换域内实现图像水印的方法。这种算法充分利用小波变换的特点,把原始图像及水印图像塔式分解,在多分辨率分解后的相同的频段来嵌入水印信息。该方法也利用了人眼视觉特性,算法简单而有效。实验证明,该算法较好地解决了水印不可见性与鲁棒性之间的矛盾,对常见的水印攻击都有较强的鲁棒性。

Image Digital Watermarking Technology Based on Discrete Wavelet Transform

A watermarking technique based on DWT is presented. The algorithm makes full use of the characteristics of wavelet transform. The original images and watermarks are pyramidal transformed, and watermarks were embeded in the same frequency after multi-resolution decomposition. The algorithm also takes use of the characteristics of HVS, and it is simple and efficient. Experiments results show that this algorithm solve the contradiction between invisibility and robustness very well.