| UCM | SATREM | NWPU |
ResNet-50 | 0.82 | 0.86 | 0.80 |
DBOW | 0.83 | 0.93 | 0.82 |
D-CNN | 0.87 | 0.85 | 0.74 |
V-DELF | 0.92 | 0.89 | 0.86 |
our method | 0.92 | 0.90 | 0.89 |