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

Table 4

Edge line estimation accuracy of simulated and experimental scan points with varying incident angles and angular resolutions for the two side surfaces.

Scan indicator			Accuracy (mm)
Data set	Area	Ang. resol (°)	Vector-sum	LSR 1	LSR 2	RAN. 1	RAN. 2
Simulation	Side surface 1	0.036	1.64	1.50	1.59	1.87	1.91
		0.072	2.02	2.35	2.54	3.71	3.95
	Side surface 2	0.036	1.83	1.22	1.33	1.56	1.81
		0.072	2.63	2.26	1.89	4.15	2.99
Average		—	2.03	1.83	1.87	2.82	2.67
Experiment	Side surface 1	0.036	1.97	1.80	1.98	2.27	2.35
		0.072	2.26	2.67	2.73	3.81	4.03
	Side surface 2	0.036	1.91	1.34	1.53	1.86	1.99
		0.072	2.72	2.40	2.07	5.05	4.49
Average		—	2.22	2.05	2.08	3.25	3.22