Detection of Surface Crack in Building Structures Using Image Processing Technique with an Improved Otsu Method for Image Thresholding

Table 1

Results of crack analysis.

Testing image	Crack objects	Area	Orientation	Mean crack width	Maximum crack width	Perimeter	Length
1	—	—	—	—	—	—	—
2	1	2441	−17.36	3.24	6.32	750.74	372.13
3	1	2238	−89.58	4.27	9.99	1250.00	620.88
4	1	1738	−14.57	0.18	0.45	879.35	439.50
5	1	97	86.15	1.36	1.94	140.94	69.11
	2	194	85.42	0.88	1.12	250.77	124.50