New Detection Algorithm of Double Compression in JPEG Image

This paper proposes a new algorithm for detection of double compression in JPEG image for applications in steganalysis,which based on the analysis of the influences on absolute histogram brought about by the double compression. It compares the histograms of single-compressed and double-compressed images and finds that both the absolute differences of DC and AC coefficients and the absolute differences of AC and AC coefficients change obviously after double compression. Support Vector Machine(SVM) classifiers are trained to detect an image whether double-compressed or not. Experimental results show that the proposed method is better than the algorithm proposed by Pevny T and Fridrich J(IEEE Trans. on Information Forensics and Security,2007,No.2) while the false positive alarm is controlled under 5%.