基于奇异值分解的灰度图像脆弱水印认证系统

A Grayscale Images Fragile Watermark Authentication System Based on the Singular Value Decomposition

提出一种基于奇异值分解的灰度图像脆弱水印认证系统,此系统将原始图像分成8×8的小块,每个小块进行DCT后,提取其低频分量信息,生成水印图像,再使用基于奇异值的算法进行水印嵌入,并对原始图像和嵌入水印后的图像生成认证码,通过公钥加密后传输.实验结果表明,该系统在认证阶段能对已经篡改和攻击的图像进行篡改锁定.

The paper proposes a grayscale images fragile watermark authentication system based on the decomposition of the singular value.The system divides the grayscale image into small 8×8pieces.Each small piece is made into DCT transform and extracted low frequencies to form the watermark.Then,the system uses the decomposition of the singular value to embed watermark,hash algorithm with original image and watermarked image to form authentication codes.In the authentication phase,the image which has been tampered and attacked can be locked from tampering.