一种基于人眼视觉系统的小波水印系统研究

针对图像水印的不可见性要求,将小波变换与人眼视觉系统的特征相结合,运用图像融合技术,设计出一种适用于静态图像的小波域水印算法.该算法嵌入的不是直接的水印图像数据本身,而是经过小波变换后的水印数据.经过不同尺度小波变换后的水印图像和载体图像的相互融合,产生出新的嵌有水印的图像.在水印的嵌入过程中,通过加入人眼视觉特性,使数据的嵌入强度和载体图像的特性相符.研究表明该算法大大地增强了水印的鲁棒性和不可见性.

Research on wavelet watermarking algorithm based on HVS

To meet the requirement of invisibility of image watermarking,combining wavelet transform and human visual systems characteristics,and using image fusion technology,the watermarking algorithm of wavelet domain using for still images is designed in the thesis.According to the algorithm,watermark image data itself is not directly embedded,but the watermark data through a wavelet transform.After wavelet transform at different scales,the watermark image and vector images are blended to produce a new image with embedded watermark.In the process of watermark embedding,by adding the human visual characteristics,so that the embedding intensity of data correspond with the characteristics of the carrier image.From the studies,it can be clearly shown that the algorithm greatly enhances the watermark robustness and invisibility.