Revealing Traces of Image Resampling and Resampling Antiforensics

Figure 5

The distribution of (a) and (b) for 1500 uncompressed unaltered images and their upscaled (, bicubic) and forged upscaled (attack 1, , , bicubic) versions. -coordinate: the index of AR coefficient; -coordinate: averaged value of AR coefficient.

(a)

(b)