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Table 5 CNN results depending on various threshold values.

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

Specimens

The number of pixels from the proposed CNN model with using threshold

Threshold = none

Threshold = 100

Threshold = 180

Threshold = 200

Result

Order

Result

Order

Result

Order

Result

Order

P1-60

33,987,368

5

4,318,206

4

2,016,520

4

1,532,640

4

P1-120

39,942,906

2

6,102,724

2

2,875,649

3

2,183,620

3

P2-60

35,924,210

4

3,844,416

5

1,952,067

5

1,525,105

5

P2-120

40,607,469

1

5,652,050

3

2,986,106

2

2,372,325

2

P3-60

37,277,057

3

8,239,397

1

4,814,109

1

3,952,994

1