【摘要】 提出了一种基于DCT的图像数字水印新算法.该算法根据二值水印图像像点取值情况,相应地改变中频段两个位置处DCT系数的大小关系;同时利用人类视觉系统的特性,对纹理较复杂的图像块中加入水印,增强了水印的不可见性.实验证明该算法是有效的.更多还原

【Abstract】 A new image watermarking algorithm based on DCT is proposed in this paper.Based on the algorithm and the pixel value of watermarks,we change or do not change the locations of two DCT coefficients in middle-band by comparing the coefficients. Based on the features of human visual system,the watermarks are embeded into the blocks which have more texture characteristics in the image to make the watermarks less visible. The experimental results show that the algorithm is effective.更多还原