A DenseNet CNN with a log-cosh loss estimates the first 15 primary JPEG quantization steps under aligned, non-aligned, QF1 below QF2, and QF1 above QF2 double compression, and on 64x64 patches.
Detecting doubly compressed JPEG images by factor histogram,
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Primary quantization matrix estimation of double compressed JPEG images via CNN
A DenseNet CNN with a log-cosh loss estimates the first 15 primary JPEG quantization steps under aligned, non-aligned, QF1 below QF2, and QF1 above QF2 double compression, and on 64x64 patches.