Fig. 4From: Estimating Previous Quantization Factors on Multiple JPEG Compressed ImagesAverage accuracy of the estimation for each DCT coefficient (first is DC) employing standard tables with QF1={60,65,75,80,85,90,95} and QF2=90. Plot shows results of our method, Bianchi et al. [17] and Niu et al. [28]Back to article page