基于相关检测的空间域盲数字水印算法  

Blind Digital Watermark Algorithm Based on the Correlative Detection in Spatial Domain

作　　者：鲁英春[1] 

机构地区：[1]绵阳师范学院数学与计算机科学学院,四川绵阳621000

出　　处：《绵阳师范学院学报》2009年第2期78-81,共4页Journal of Mianyang Teachers＇ College

摘　　要：在数字图像水印的通信模型的基础上,对水印图像置乱以提高水印图像的抗干扰能力,再使用m序列扩频码调制水印,将水印嵌入到数字图像相应的空间域。水印的检测通过wiener滤波对原图像进行估计,求得估计图像与水印图像的差值,再与原扩频码进行相关检测,从而不需要原始图像。实验结果表明,新的算法在保证水印的不可见性的同时,实现了盲检测,同时对亮度N对比度等图像增强及噪声干扰等攻击也具有较好的稳健性。A new digital watermark algorithm based on the correlative detection in spatial domain is proposed in this paper. On the basis of establishing the communication model of digital image watermark, the original watermark image is scrambled to improve the anti -jamming capability of the watermark, and then embed the spread - spectrum - modulated watermark into the corresponding spatial domain of the digital image. The detection is realized by computing the correlation between different images and the original spread - spectrum codes. Experimental results indicate that the algorithm has the features of watermark imperceptibility, blind detection in extracting, and is still robust to the attacks of brightness, contrast conversion and noise.

关 键 词：数字图像水印 相关检测 图像置乱 M序列 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]