基于整数小波变换的可逆数据库水印

摘要

提出了一种基于整数小波变换的可逆数据库水印算法,通过对数据库数据的小波域高频系数进行分析,确定算法的溢出预防机制.将水印嵌入到数据库数据的小波域中,提高水印的不可见性.分块策略的使用进一步提高了水印的不可见性.通过修改数据块的小波高频系数均值,将一位水印与数据块绑定来提高水印的鲁棒性.仿真实验表明,该水印具有良好的不可见性和一定的鲁棒性.%A reversible database watermark based on integer wavelet transform is proposed.High frequency coefficients of wavelet domain of the database data are analyzed to determine the overflow prevention mechanism of the scheme.The watermark is embedded into the wavelet domain of the database in order to improve the watermarking invisibility.Blocking strategy is used to further enhance the watermarking invisibility.By modifying the mean of the wavelet high frequency coefficients of the data block,we can embed one watermark into the data block to improve the robustness of the watermark.Experimental results show that the scheme is effective.