Complex Texture Contour Feature Extraction of Cracks in Timber Structures of Ancient Architecture Based on YOLO Algorithm

Table 2

Evaluation index of dangerous cracks [2].

Crack type	Length index	Width index	Schematic diagram
Beam crack 1	Greater than or equal to 1/3 of the beam length	Greater than 10mm
Beam crack 2	Greater than or equal to 1/3 of beam height	Greater than 10mm
Column crack	Greater than or equal to 1/3 the column length	Greater than 10mm