一种基于分块DCT变换和水印置乱的嵌入算法

An Embedded Method Based on Block DCT Transformation and Scrambled Watermark

本文提出一种以图像为水印的DCT变换的数字水印算法,为实现数字水印的嵌入后原始图像不会出现块效应,首先我们对水印图像进行了置乱,为使分块后每块水印图像能完整的嵌入到原图像每块的直流和低频分量部分,我们对水印和原始图像分别进行了4×4和8×8分块DCT变换,为了增加水印嵌入的鲁棒性,我们把水印的每个子块都同时嵌入到多个原图像的子块中。试验结果证明该算法具有较好的不可见性,鲁棒性和抗攻击性。

A digital watermark arithmetic after DCT transformation taking an image as watermark, to prevent the block effect after embedding the digital watermark into the initial image, we firstly scramble the watermark image, to completely embed watermark image of each block into DCT coefficients and low frequency coefficients of each block of the initial image, we transform the watermark image and the initial image respectively in 4×4 and 8×8 block, to improve the robustness of the embedded watermark, we embed each block of the watermark image into a plurality of the blocks of the initial image. The experiment results prove that this arithmetic is of better invisibility, robustness and anti-attack.