基于小波变换和视觉掩蔽的自适应水印方案

Self-adaptive watermark scheme based on wavelet transformand visual masking

随着计算机网络技术与多媒体技术的快速发展,数字产品的版权保护已经成为信息技术领域中最重要的问题之一。提出了一种小波域透明图像水印算法,该算法的特点是选择一个二值图像作为水印,将其内嵌到原始图像经过小波多分辨率分解后的低频子带上,并利用人眼视觉掩蔽特性对水印的添加强度进行自适应调节,设立标志矩阵记录水印嵌入信息并用作水印的检测。实验结果表明:水印是不可察觉的,经过常用的图像处理后仍是鲁棒的。

With the rapid development of computer networks and the further progress of multimedia technologies, copyright protection of digital media has been one of the most important issues in information technology field. An approach for transparent image watermark based on wavelet multiresolution decomposition is proposed in which a binary image is embedded in the original image. The method uses the characterastic of Human Visual System(HVS) to adjust the intensity of the watermark adaptively. A flag matrix is set to record information about embedding watermark and be used for detecting the watermark. Experimental results show that the watermark is invisible and the algorithm is robust to common image processing.