Table 3 Accuracy obtained by the proposed approach on Dresden [33] dataset with different patch size and QF1/QF2
From: Estimating Previous Quantization Factors on Multiple JPEG Compressed Images
Images | Size | Patch size | % | QF1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
QF2 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | ||||
1488 | 160X120 | 64X64 | 21,3% | 90 | 0,96 | 0,96 | 0,94 | 0,93 | 0,91 | 0,75 | 0,21 | 0,33 | 0,30 |
64X64 | 21,3% | 80 | 0,78 | 0,73 | 0,76 | 0,60 | 0,05 | 0,29 | 0,19 | 0,13 | 0,14 | ||
160X120 | 100% | 90 | 0,99 | 0,99 | 0,99 | 0,99 | 0,99 | 0,97 | 0,44 | 0,32 | 0,32 | ||
160X120 | 100% | 80 | 0,91 | 0,87 | 0,94 | 0,89 | 0,84 | 0,21 | 0,21 | 0,15 | 0,16 | ||