基于二维Walsh变换和斜变换的数字水印算法

论文给出了一种基于Walsh变换和斜变换的数字水印算法,实现的载体为图像。这两种变换都属于正交变换,取值简单且有即位算法,运算快捷,非常利于实时信号处理。实验表明,添加水印的图像具有较强的不可见性和鲁棒性,能够抵抗常见的攻击。尤其是亮度逐渐变化的图像,受到攻击后提取出的水印的效果比较好。提取水印不需要原图像,为盲水印。

Digital Watermarking Algorithm Based on 2-D Walsh and Slant Transforms

In this paper,we discuss a new digital watermarking algorithm based on two-dimension Walsh and Slant transforms for digital images.These transforms are both orthogonal and have simple values and in-place algorithms.So they can be implemented fast and are very suitable for in-time signal processing.The results of the experiments show that images which are embedded with the watermark is not only invisible to the image but also robust to the normal attacks,especially for the images that are changed gradually in brightness.Moreover,it is a blind watermark which needn't the original image when distilled.