抗剪切鲁棒图像数字水印的研究与实现

数字水印是解决信息安全和版权保护的有效方法,为增强其鲁棒性,提出一种结合离散余弦和离散小波的数字图像水印算法:对原始灰度图像进行小波分解,对得到的LL图像按照一定大小进行分块;对每一块进行离散余弦变换,把水印图像经过Arnold置乱后的值嵌入到变换后的系数上;进行逆变换。实验结果表明,该算法能够经受住中值滤波、剪切等的攻击,具有很强的鲁棒性。

Research and implementation of image watermarking algorithm robust to image cutting

Digital watermarking is an effective approach for information security and copyright protection.It has been a hot technology in the field of multimedia information security.In this paper,a watermarking algorithm for digital image based on DWT and DCT is introduced.This algorithm manipulates the original image by DWT,then adds watermark through Arnold transform onto the important wavelet coefficients located at the low frequency sub-band,which is split into blocks and manipulated by DCT.The test based on this algorithm demonstrates that the watermarking is robust to the common signal processing techniques including medium filtering and cutting.