Acta Photonica Sinica, Volume. 50, Issue 10, 1010002(2021)
Fast Screening Method of Bridge Crack Images
Figures & Tables(13)
Fig. 8. Comparison of screening performance between Canny algorithm and Gabor algorithm
Table 1. The manually selected threshold
View tableView in ArticleTable 1. The manually selected threshold
Image resolution Threshold Image resolution Threshold 300×300 30 1 280×720 55 400×400 37 1 440×960 60 500×500 45 1 920×1 080 65 580×580 50 2 880×1 920 70 1 024×768 60 3 840×2 160 80 1 080×720 55 5 760×3 840 85
Table 2. Comparison of screening performance results
View tableView in ArticleTable 2. Comparison of screening performance results
Resolution Screening mode Threshold A CA NA CR NR 580
×580
Threshold manually calculated and minimum circumscribed circle 50 98% 98.00% 98.00% 98% 98% Threshold calculated by the model and minimum circumscribed circle 46.2 98% 98.00% 98.00% 98% 98% Minimum circumscribed rectangle aspect ratio 0.4 91% 88.67% 93.61% 94% 88% 1 024
×768
Threshold manually calculated and minimum circumscribed circle 60 91% 91.83% 90.19% 90% 92% Threshold calculated by the model and minimum circumscribed circle 55.3 91% 91.83% 90.19% 90% 92% Minimum circumscribed rectangle aspect ratio 0.4 86% 84.61% 87.50% 88% 84% 1 440
×960
Threshold manually calculated and minimum circumscribed circle 60 98% 100.00% 96.15% 96% 100% Threshold calculated by the model and minimum circumscribed circle 61.2 98% 100.00% 96.15% 96% 100% Minimum circumscribed rectangle aspect ratio 0.35 85% 83.01% 87.23% 88% 82% 1 920
×1 080
Threshold manually calculated and minimum circumscribed circle 65 96% 100.00% 92.59% 92% 100% Threshold calculated by the model and minimum circumscribed circle 65.5 95% 100.00% 90.90% 90% 100% Minimum circumscribed rectangle aspect ratio 0.35 80% 80.00% 80.00% 80% 80% 5 760
×3 840
Threshold manually calculated and minimum circumscribed circle 85 98% 96.15% 100.00% 100% 96% Threshold calculated by the model and minimum circumscribed circle 89.8 98% 96.15% 100.00% 100% 96% Minimum circumscribed rectangle aspect ratio 0.3 88% 82.75% 95.23% 96% 80%
Table 3. Comparison of average performance data
View tableView in ArticleTable 3. Comparison of average performance data
Screening mode A CA NA CR NR Threshold manually calculated and minimum circumscribed circle 96.2% 97.19% 95.38% 95.2% 97.2% Threshold calculated by the model and minimum circumscribed circle 96% 97.19% 95.04% 94.8% 97.2% Minimum circumscribed rectangle aspect ratio 86% 83.80% 88.71% 89.2% 82.8%
Table 4. Comparison results of screening time and detection time
View tableView in ArticleTable 4. Comparison results of screening time and detection time
Image resolution Average screening time/s Average detection time/s 580×580 0.08 4.98 1 024×768 0.21 13.29 1 440×960 0.34 21.24 1 920×1 080 0.45 48.33 5 760×3 840 3.97 255.05
Table 5. Statistical results of time spent in crack detection
View tableView in ArticleTable 5. Statistical results of time spent in crack detection
Image Resolution The ratio of crack images and nocrack images Time used for crack detection/s Time to detection after screening/s Time
saved/s
Percentage of time saved/% 580×580 1∶9 506 49 457 90.31% 3∶7 502 149 353 70.31% 5∶5 498 253 245 49.19% 1 024×768 1∶9 1 318 107 1 211 91.88% 3∶7 1 311 219 1 092 83.29% 5∶5 1 329 367 962 72.38% 1 440×960 1∶9 2 175 194 1981 91.08% 3∶7 2 110 460 1 650 78.19% 5∶5 2 124 703 1 421 66.90% 1 920×1 080 1∶9 4 401 408 3 993 90.72% 3∶7 4 404 855 3 549 80.58% 5∶5 4 833 1 285 3 548 73.41% 5 760×3 840 1∶9 25 520 2 239 23 281 91.22% 3∶7 25 498 4 747 20 751 81.38% 5∶5 25 505 7 772 17 733 69.52%
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Jianchao DU, Chenglong YU, Mengnan ZHAO, Xiaopeng WANG. Fast Screening Method of Bridge Crack Images[J]. Acta Photonica Sinica, 2021, 50(10): 1010002
Paper Information
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Received: Jun. 7, 2021
Accepted: Jul. 22, 2021
Published Online: Nov. 3, 2021
The Author Email: YU Chenglong (1792237357@qq.com)
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