A Comparison Study of Edge Line Estimation Algorithms for Dimensional Quality Assessment of Precast Concrete Slabs

Table 3

Edge line estimation accuracy of experimental scan points with varying incident angles and angular resolutions.

Scan indicator				Accuracy (mm)
Dataset	Area	Idc. ang. (°)	Ang. resol (°)	Vector-sum	LSR 1	LSR 2	RAN. 1	RAN. 2
Simulation	Outer corners	0	0.036	1.25	1.82	1.11	1.87	1.23
		—	0.072	1.57	1.86	0.80	3.22	2.88
		45	0.036	1.38	2.00	0.92	2.98	2.48
		—	0.072	3.41	2.86	2.24	5.53	5.68
	Shear pocket	0	0.036	0.73	2.10	1.79	1.90	1.62
		—	0.072	1.88	2.46	2.03	2.06	1.78
		45	0.036	1.35	2.14	1.72	2.24	1.85
		—	0.072	2.42	1.64	1.88	1.42	1.84
Ave.		—	—	1.75	2.11	1.56	2.65	2.42
Experiment	Outer corners	0	0.036	1.56	2.48	1.81	2.67	2.07
		—	0.072	3.09	3.93	2.62	4.47	3.74
		45	0.036	2.62	2.97	2.52	3.90	3.44
		—	0.072	5.39	5.19	4.43	6.88	6.39
	Shear pocket	0	0.036	1.65	2.40	2.10	2.74	2.45
		—	0.072	2.75	3.58	2.93	3.94	3.14
		45	0.036	2.05	2.80	2.35	3.05	2.59
		—	0.072	4.36	3.87	2.88	3.88	2.86
Ave.		—	—	2.93	3.40	2.71	3.94	3.33