Review Article
Development of Inspection Robots for Bridge Cables
Table 3
Parameters used in the image-processing tests.
| | Parameters | Type I | Type II | Type III |
| | Structuring element shape | Line | Line | Line | | Structuring element size | 5 (pixels) | 10 (pixels) | 5 (pixels) | | Structuring element orientation | [0° 45° 90° 135°] | [0° 45° 90° 135°] | [0° 45° 90° 135°] | | Binary threshold | — | — | Otsu’s filter | | Crack connection (pixel) | 20 | 20 | 20 | | Length threshold before connection (pixel) | 40 | 70 | — | | Length threshold after connection (pixel) | 60 | 70 | — | | Area threshold before connection (pixel) | 30 | 100 | 10 | | Area threshold after connection (pixel) | 40 | 100 | — | | Eccentricity threshold (pixel) | — | — | 0.958 |
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