基于DWT变换的彩色图像抗几何攻击的置乱水印算法

A Novel Anti-geometrical Attack Color Image Scrambling Watermarking Algorithm Based on Discrete Wavelet Transform

数字水印技术在信息安全领域具有重要作用.为满足数字水印的不可感知性及鲁棒性要求,对DWT变换在时-频域同时具有良好的局部化性能做了简要介绍,提出了一种基于DWT变换和HVS的彩色图像的置乱水印算法,即将置乱的数字水印嵌入到载体图像经DWT变换后能量较大的高频系数当中,实现水印的嵌入.仿真实验表明算法简单高效,嵌入水印的载体图像无明显失真,且提取水印准确易辨,能够抵抗多种几何攻击,具有较好的鲁棒性和不可感知性.

Digital watermarking technology plays an important role in the field of information security.In order to meet requirement of imperceptibility and robustness of watermarking,the good localization performance in the time-frequency domain of discrete wavelet transform is introduced and a new color image watermarking method based discrete wavelet transform and Human Visual System is proposed.The scrambled digital watermarking is embedded into the high frequency coefficients of color host image.The experiment results indicate that the proposed watermarking scheme is efficient and simple,the embedded watermarking images are not apparent distortion and the extracted watermarking is easily discernible and accurate.The algorithm can resist all kinds of geometrical attacks.