Table 2 Accuracy obtained by proposed approach compared to Bianchi et al. ([17]), Galvan et al. ([4]) and Niu et al. ([28]) employing custom tables for first compression
From: Estimating Previous Quantization Factors on Multiple JPEG Compressed Images
PS | QF2=80 | QF2=90 | ||||||
|---|---|---|---|---|---|---|---|---|
Proposed | [17] | [4] | [28] | Proposed | [17] | [4] | [28] | |
5 | 0.66 | 0.39 | 0.53 | 0.08 | 0.78 | 0.64 | 0.66 | 0.07 |
6 | 0.45 | 0.11 | 0.46 | 0.03 | 0.82 | 0.51 | 0.68 | 0.08 |
7 | 0.62 | 0.23 | 0.54 | 0.08 | 0.78 | 0.5 | 0.64 | 0.08 |
8 | 0.19 | 0.06 | 0.04 | 0.02 | 0.79 | 0.26 | 0.7 | 0.1 |
9 | 0.3 | 0.19 | 0 | 0.09 | 0.49 | 0.03 | 0.49 | 0.02 |
10 | 0.18 | 0.01 | 0 | 0.41 | 0.43 | 0.18 | 0 | 0.28 |
11 | 0.19 | 0.04 | 0.04 | 0.26 | 0.39 | 0.05 | 0.02 | 0.7 |
12 | 0.21 | 0.05 | 0.05 | 0.22 | 0.38 | 0.05 | 0.02 | 0.75 |
MEAN | 0.35 | 0.14 | 0.21 | 0.15 | 0.61 | 0.28 | 0.4 | 0.26 |