Fig. 1From: 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={55,60,65,75} and QF2=80. Plot shows results of our method, Bianchi et al. [17], Dalmia et al. [19], Galvan et al. [4] and Niu et al. [28]Back to article page