基于序列动态选择的PVO可逆信息隐藏算法

摘要

针对灰度图随着嵌入容量的提高而导致失真明显的问题,提出一种基于序列动态选择的可逆信息隐藏算法.新算法在动态分块像素值排序(PVO)算法基础上进行改进,对动态分类复杂像素块中可能存在的可嵌序列,利用阈值判定实现动态选择,然后对动态选择获得的可嵌序列进行I-PVO可逆信息嵌入.仿真结果表明,所提出的算法在嵌入容量和图像失真度性能方面有明显提高.%In order to reduce the influence of the obvious distortion of grayscale graphs with the increase of embedding capacity, an improved reversible data hiding algorithm based on sequence dynamic selec-tion was proposed. The new algorithm was improved on the basis of pixel value ordering( PVO) and dy-namic pixel block partition,and the possible embedded sequence in complex pixel blocks was selected during the dynamic classification by adaptive thresholds. Then, I-PVO reversible information embedding was implemented for dynamically selected embedded sequences. The simulation results showed that the proposed algorithm had obvious improvement in embedding capacity and image distortion performance.