【摘要】 边缘匹配(SM)密写法会引起像素灰度差值直方图统计特性的异常,使灰度差值直方图中出现阶梯,分析者据此可以察觉秘密信息的存在。为加强安全性,提出一种改进的方案,即动态地划分差值|d|的区间,以消除阶梯效应。并在对d进行调整时,在多个候选值中选择一个与原始值最接近的,有效地减小了失真,取得了更好的视觉隐蔽性。实验证明了该方法的有效性。更多还原

【Abstract】 The Side Match(SM) inevitably causes abnormality in the pixel-value difference histogram,so there are unusual steps in the histogram of pixel-value differences.This provides a clue for steganalysis to reveal the presence of a secret message.To enhance security,a modified scheme is proposed.Classify pixel-value differences |d| into a number of continuous ranges with dynamic,which avoids occurrence of the above-mentioned steps in the pixel-value difference histogram.And adjust d to the value that is closest to the original among all the candidate values,which can effectively reduce the distortion and achieve better imperceptible.Experimental results show the effectiveness of the proposed technique.更多还原