基于可逆整数变换和ECC校验的可逆水印算法

REVERSIBLE WATERMARK ALGORITHM BASED ON REVERSIBLE INTEGER TRANSFORM AND ECC CHECK

数字水印技术已经成为保护数字媒体版权和防纂改的重要方法之一,并且已经日渐完善和成熟,但是现实中许多场合要求去除水印后的载体图片和原图完全一致,不允许嵌入水印而产生的任何失真,于是在脆弱水印方向上产生了可逆水印。通过理论和实验分析,提出一种基于可逆整数变换和ECC校验的可逆水印算法。利用整数变换后均值和差值之间存在的冗余,嵌入由ECC校验算法计算产生的认证信息。实验结果表明,本算法能在图片中找到合适的冗余位置进行水印的嵌入,并且在接受端可以完全恢复的原图内容,实现图片的完整性保护。

Technology of digital watermark has been one of the major means in copyright protection of digital media and tamper-proofing, and has become increasingly perfect and mature.However,in many practical situations,carrier pictures with watermark removed are required to be right the same as the original ones,but allowed no distortion brought by the watermark,so the reversible watermark is being studied widely as a branch of semi-fragile watermark.This paper introduces a reversible watermark algorithm based on reversible integer transform and ECC check through the analysis of the theories and the experiments.We use statistical redundancy between the average and the difference derived from integer transform to embed the calculated authentication message generated by ECC checking algorithm.Experimental results showed,this algorithm can find proper redundant place to embed the watermarks,and in the receiving end,entire original image can be fully restored,thus achieves the integrity protection of the picture.