Well, maybe p06 is a false positive, but probability that the same with bike3 is lower:
Code:
bike 1.037 NO, this doesn't look like an ex-JPEG image.
bike3 1.265 ! YES, this looks like an ex-JPEG image, no smoothing.
cafe 1.027 NO, this doesn't look like an ex-JPEG image.
woman 1.024 NO, this doesn't look like an ex-JPEG image.
bird_of_paradise 1.000 NO, this doesn't look like an ex-JPEG image.
honolulu_zoo 1.000 NO, this doesn't look like an ex-JPEG image.
oahu_northcoast 1.000 NO, this doesn't look like an ex-JPEG image.
p01 1.052 Maybe. Try better methods.
p04 1.018 NO, this doesn't look like an ex-JPEG image.
p06 1.184 ! YES, this looks like an ex-JPEG image, shifts: 5, 0.
p08 1.000 NO, this doesn't look like an ex-JPEG image.
p10 1.024 NO, this doesn't look like an ex-JPEG image.
p14 1.047 NO, this doesn't look like an ex-JPEG image.
p26 1.056 Maybe. Try better methods.