[Retracted] Intelligent Edge Computing Detection Vehicle and Detection Method Based on Tunnel Lining Concrete

Table 5

Different threshold segmentation methods to process the image data table.

Attributes	A	B	C	D	E	F	P
Image after image preprocessing	2.20	2.12	3.42	3.97	5.24	5.21	0.001
Fixed threshold segmentation	2.02	2.22	2.94	3.87	5.24	4.95	0.005
Otsu threshold segmentation	1.77	2.69	2.81	4.08	5.43	5.16	0.005
Iterative threshold segmentation	2.17	2.05	3.74	3.42	5.68	5.55	0.001
Maximum entropy threshold segmentation	2.50	2.50	3.23	3.87	4.96	5.40	0.017
Local threshold segmentation	2.32	1.91	3.01	4.62	5.21	5.02	0.028