Fig. 7From: Estimating Previous Quantization Factors on Multiple JPEG Compressed ImagesOverall accuracy of the proposed method on JPEG triple compressed images when trying to estimate the Qm−1 quantization factors. First row identifies patch size 64×64,128×128,256×256 and QF3=80 respectively [(a),(b),(c)], while second row is related to the same patch sizes and QF3=90 [(d),(e),(f)Back to article page