Table 1 The comparison of indicators for image quality.
Preprocessing methods | Image | Brightness | Average gradient | Energy gradient | Information entropy |
|---|---|---|---|---|---|
Unprocessed (original image) |
| 55.114 | 46.639 | 42,982,725 | 7.05 |
Dark channel prior method |
| 41.819 | 50.420 | 46,467,084 | 6.71 |
Histogram equalization method |
| 129.033 | 54.873 | 50,570,785 | 7.64 |
The proposed method |
| 121.583 | 63.648 | 58,657,747 | 7.19 |
