介绍了一种基于统计特性的LSB密写分析方法,对其进行了改进并提出了可靠估计信息隐藏长度的方法。该方法利用相邻像素相关性定义了统计量,可根据阈值判断秘密信息的有无。对待检测图像进行二次嵌入,根据统计量的变化建立模型,能可靠估计秘密信息隐藏长度。实验表明,估计出的信息量比较准确。-This paper introduces a steganalysis algorithm based on statistics method for LSB steganograhpy and mends it,proposes a method estimating the quantity of hiding data reliably.The method defines statistics using the relativity of close pixels and judges the existence of secret message with threshold.It inserts message in the waiting detected image again,modeles according to the changes of statistics.The model can estimate the quantity of hiding data reliably.Experimental results show the quantity of hi...