一个基于DWT和改进Arnold置乱的数字水印算法

A Watermarking Algorithm Based on DWT and Improved Arnold Scrambling

给出一种DWT和改进的Arnold图像置乱相结合的数字图像水印算法.在水印图像嵌入之前先对水印图像作改进的Arnold变换,对水印图像的位置和灰度做双置乱,然后用离散小波变换把原始图像分解成多频段的图像,使水印的嵌入和检测可分多个层次进行.实验结果表明,改进的置乱算法能在少量的迭代次数下达到较好的置乱效果,最终的水印图像具有良好的视觉效果和抵抗多种攻击的能力.

A new digital watermark algorithm based on improved Arnold image-scrambling and DWT is presented.The algorithm first scrambles the watermark using a two-dimensional Arnold transformation for both position and gray.Then the original image is decomposed into multi-band image using discrete wavelet transform.And the watermark embedding and detection can be divided into multiple levels.Experiments results show that it can achieve preferable good scrambling effect in smaller number of scrambling iterations.And the final watermarked image has good visual effects and the ability to resist a variety of attacks.