Works to achieve this extract jpeg image DCT coefficients of the first letter of the probability of detection as a jpeg heavy compression feature, this feature trained classification templates that can detect a single jpeg image compression or recompression.

extract_feature\dump_dct2.pro
...............\dump_dct2.pro.user
...............\helpers.cpp
...............\helpers.h
...............\jpeg_tools.cpp
...............\jpeg_tools.h
...............\main.cpp
extract_feature

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