Image-Based Framework for Concrete Surface Crack Monitoring and Quantification

Table 1

Extracted areas and perimeters of cracks (numbers in parentheses are true values of extracted quantities: for areas, the multiplier is 0.89²mm²; for perimeter, the multiplier is 0.89mm).

Geometric quantities	Crack images at
	T1	T2	T3
Areas	793	1240	1698
	(628mm^2)	(982mm^2)	(1345mm^2)
Perimeters	308	279	289
	(274mm)	(248mm)	(257mm)