Experimental Investigation of Crack Initiation and Propagation in the Unreinforced Masonry Specimen Subjected to Vertical Settlement

Table 2

Distance mean square error of the photogrammetry system (mm).

	46–53	49–66	63–76	64–78	120–121	122–123
1	488.723	400.016	600.108	801.612	902.239	899.978
2	488.806	400.103	599.996	801.562	902.168	899.863
3	488.732	400.018	600.011	801.652	902.303	900.033
4	488.769	400.022	599.909	801.493	902.189	899.906
5	488.741	400.051	600.002	801.528	902.224	900.007
6	488.759	400.029	600.009	801.521	902.152	899.989
7	488.751	400.032	599.981	801.499	902.209	900.017
8	488.789	400.063	600.001	801.606	902.213	899.971
9	488.871	400.055	600.012	801.611	902.271	900.015
10	488.833	400.106	600.003	801.512	902.164	900.009
Mean squared error (MSE)	0.0474	0.0331	0.0478	0.0567	0.0483	0.0541
Nominal accuracy (MSE)	0.0581	0.0405	0.0585	0.0694	0.0591	0.0662