摘要
提出了一种可自恢复的图像篡改认证算法,原始图像的最低位和3/4次低位置零和进行2×2分块DCT变换的基础上,提取DC分量组成图像矩阵,DC分量量化产生特征图像。特征图像经过Arnold置乱,将其二值编码作为水印并混沌加密后嵌入到原始图像的最低位和3/4次低位。实验结果表明,该算法简单、安全性高,篡改精确定位到2×2图像块,可对篡改区域近似恢复,具有较好的实用性。
The paper presented a authentication algorithm of image based on DCT. The proposed scheme firstly sets the least significant bit （LSBs） and three times Hypo-LSB in the original image to zero,and it is divided into 2 × 2 pixel image block, then each block is discrete cosine transformed, and extracted DC component to construct image matrix. The feature image is obtained by quantizing the DC component. The feature image scrambles by Arnold, then the binary code of feature image as watermark is embedded into the LSBs of original image which were set to zero. The experiment results show that the algorithm is simple, safe, accurate location to tamper with 2 × 2 blocks images can be tampered with the region to the recovery, has good practicality.
出处
《电脑与信息技术》
2010年第2期3-5,44,共4页
Computer and Information Technology
关键词
图像认证
自嵌入
离散余弦变换(DCT)
image authentication
self-embedding
discrete cosine transform（DCT）
