Table 4.

Quantitative results of crack testing based on Poisson reconstruction degree.

Reference crack depth(mm)	0.35	0.5	1.0	1.5	2.0	2.5	3.5	5	8
Maximum Poisson reconstruction degree	0.046	0.048	0.047	0.05	0.048	0.047	0.049	0.049	0.052
Quantitative depth(mm)	0.32	0.52	0.92	1.56	2.1	2.6	3.41	4.2	7.8
Quantitative error (%)	−0.09	0.04	−0.09	0.04	0.05	0.04	−0.03	−0.19	−0.03
Mean Absolute Error	0.16
Mean Squared Error	0.05