基于PVD隐写术的载体图像的选择研究

Study and Selection of Carrier Image Based on the Steganography of PVD

设计高性能嵌入算法与选择合适载体图像是提高隐写术性能的两个重要途径。基于像素差值PVD(pixel-value differencing)是一种算法复杂度低,嵌入容量大的高性能隐写算法。本文针对PVD嵌入算法,研究最佳载体选择问题。论文分析与讨论载体图像的复杂度、直方图及其平滑度等载体图像特征值,和相对熵、直方图的改变量等隐写术系统性能参数之间的关系,研究载体图像的特征值对PVD隐写术系统性能的影响,为PVD隐写算法选择最佳的载体图像提供理论依据。实验结果表明,选择直方图曲线连续变化缓慢的图像作为PVD隐写算法的载体图像,能有效提高隐写术系统的不可感知性能。

Designing high performance embedded algorithm and choosing a suitable carrier image are two important ways to improve the performance of steganography. The algorithm of pixel value differ- encing （PVD） is a method of low complexity and large - capacity. Based on the embedding algo- rithm of PVD, the selection of the best carrier is considered. In this paper, the relations between the characteristic values of the complexity, histogram, smoothness of the carrier image, and the relative entropy, histogram change quantity which is steganography performance parameters of the system is analysed and discussed. The influence of characteristics values of the carrier image for steganograph- fectively improve the performance of imperceptible of steganographic system.