基于HVS特性和DCT域的数字水印新算法的研究

Research of a New Digital Watermarking Algorithm Based on HVS and DCT

提出一种应用于图像版权保护的基于HVS特性和DCT域的数字水印新算法。为保证视觉隐蔽性和鲁棒性,将二值水印图像映射为标准正态分布的伪随机序列,利用HVS特性将伪随机序列嵌入到原始宿主图像的中频部分,通过水印嵌入的逆过程提取含有水印信息的伪随机序列,再利用逆映射从伪随机序列中提取水印。对嵌入水印后的图像进行了噪声攻击、JPEG压缩、几何攻击等仿真实验,实验结果表明本算法鲁棒性很好,尤其是抗JPEG压缩。

A new digital watermarking algorithm for copyright protection of duced. This algorithm is based on HVS model and DCT domain.The watermark to b digital image is intro- e embedded in original image is a binary image, which is mapped to a random sequence of real numbers.In order to ensure invisi- bleness and robustness, the watermark is embedded to the middle frequency coefficients of the black-DCT to exploit aspects of the human visual characteristic and extract the watermark via invert mapping. Several image degradation experiments, such as noise attack,JPEG compression, geometrical attack show that this algorithm has good performance both in robustness and security especially for JPEG Compression.