Description: 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
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