Improved Algorithm of Edge Adaptive Image Steganography Based on LSB Matching Revisited Algorithm

摘要

In edge adaptive image steganography based on LSB matching revisited algorithm (EAMR for short in this paper), the secret message bits are embedded into those consecutive pixel pairs whose absolute difference of grey values are larger than or equal to a threshold T. Tan et al. [1] pointed out that since those adjacent pixel pairs can be located by the potential attackers, the pulse distortion introduced in the histogram of absolute difference of pixel pairs (HADPP for short in this paper) can easily be discovered, and a targeted steganalyzer for revealing this pulse distortion is presented in [1]. In this paper, we propose an improved algorithm for EAMR, in which the adjacent pixel pairs for data hiding are selected in a new random way. Thus the attackers cannot locate the pixel pairs selected for data hiding accurately, and the abnormality that exists in HADPP cannot be discovered any longer. Experimental results demonstrate that our improved EAMR (I-EAMR) can efficiently defeat the targeted steganalyzer presented by Tan et al. [1]. Furthermore, it can still preserve the statistics of the carrier image well enough to resist today's blind steganalyzers.