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False negative test results under the frost condition with the trained CNN and image brightness check.
| Mixed Colors | Single Color | ||||
|---|---|---|---|---|---|
| Good Lighting | Poor Lighting | Good Lighting | Poor Lighting | ||
| White/Gray | Other Colors | ||||
| No. of tests | 270 | 30 | 135 | 135 | 30 |
| Correct (“frost”) | 261 | 30 | 135 | 135 | 30 |
| Incorrect (“no frost”) | 9 | 0 | 0 | 0 | 0 |
| Accuracy (%) | 96.7 | 100 | 100 | 100 | 100 |
