摘要： 提出了一个基于信噪比SNR的完全自适应水印算法，该算法先把原始图像分块DCT，利用信噪比SNR确定各个子块的拉伸因子α，最后水印分量以不同的能量被嵌入到各个子块的DCT低频系数中。实验结果表明该算法具有良好的不可见性和鲁棒性。

关键词: 图像, 数字水印, 信噪比(SNR), DCT, 拉伸因子α

Abstract: An algorithm of adaptive image watermarking based on SNR is proposed in this paper. First ,the algorithm splits the original image into some blocks. Second, these blocks are transformed by DCT and the scaling parameter is calculated based on SNR for every block. Last, watermark components with different strength are inserted into some low-frequency coefficients. The experimental results demonstrate that the watermarks generated with the proposed algorithm have good imperceptibility and robustness.

中图分类号: 

• TP391.4