Table 3.
Grouping of FPs and FNs, and their possible solutions.
| False-Positive (FP) | False-Negative (FN) | ||
|---|---|---|---|
| Groups | Solutions | Groups | Solutions |
| crack-shaped contaminants | 1, 3 | crack hidden behind object | 4 |
| overlaid cement paste | 3 | crack having straight line | 2 |
| continuously-distributed concrete pores | 2 | crack obscured by dark surface | 1 |
| edge of linear-shaped construction material | 2 | crack on the corner of detecting window | 4 |
Solution 1: Enough illumination; Solution 2: Consideration of region areas, shapes, and continuities; Solution 3: Additional vision techniques (stereovision, IR, etc.); Solution 4: Moving image FOVs (e.g., using a video stream).