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Table 4 The number of pixels recognized as cracks from the proposed CNN model and the total crack length obtained from optical observation.

From: Automated Detection of Surface Cracks and Numerical Correlation with Thermal-Structural Behaviors of Fire Damaged Concrete Beams

Specimens

(a) The number of pixels obtained from the proposed CNN model

(b) Total crack length obtained from the optical observation (mm)

Ratio (a/b)

P1-60

33,987,368

76,316

4.45 × 102

P1-120

39,942,906

83,866

4.76 × 102

P2-60

35,924,210

75,827

4.73 × 102

P2-120

40,607,469

86,856

4.67 × 102

P3-60

37,277,057

78,000

4.77 × 102