摘要
提出了一种基于离散余弦变换的彩色图像数字水印算法。首先原始彩色图像的绿色分量进行8×8分块DCT变换。计算每块的噪声阈值,相应调整每块选取的两个中频系数的大小,把经过Arnold置乱加密的二值水印图像嵌入。水印提取时,不需要原始图像。实验结果表明,该算法能有效抵抗JPEG压缩、裁剪、加噪、图像增强等攻击,具有良好的透明性和较强的稳健性。
A digital watermarking algorithm for color images based on DCT is presented. Firstly, the green component of the original color image is divided into 8×8 blocks and DCT for each block. The noise threshold for every blocks is computed, the polarity of two corresponding middle-frequency coefficients from each blocks adjusted, and then the binary image of Arnold scrambling encryption is embedded. The original image is not required for watermarking detection. Experimental results show that the watermarking algorithm is transparent and robust for some common image processing operations, such as JPEG compression, cropping, noise adding and image enhancement.
出处
《通信技术》
2008年第11期174-176,共3页
Communications Technology
