Table 1 Composition of the Multi-Source Bolt Image Dataset.

From: Image-based detection of bolts and bolt-missing defects in multi-angle and complex background scenarios

Image source

Number of intact bolts

Number of missing bolts

Total samples

Steel suspension bridges

1857

38

1895

Transmission towers

585

45

630

Bolt joint model

852

1680

2532

total

3294

1763

5057

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