Table 1.

Changes in deformation factor n_i for the analyzed squares (smaller—0.05 m × 0.05 m and bigger—0.10 m × 0.10 m) for different environments (with and without water) and different distances (0.40 m, 0.35 m, 0.30 m) between the camera’s lens and analyze squares

Object	Environment	Distance [m]	Average deformation factor ni [-]	P
Square 0.05 × 0.05 m	Without water	0.30	1.00153 ± 0.00022	0.1837
	With water		1.00150 ± 0.00022
	Without water	0.35	1.00160 ± 0.00021	0.5499
	With water		1.00159 ± 0.00017
	Without water	0.40	1.00166 ± 0.00017	0.1020
	With water		1.00169 ± 0.00015
Square 0.10 × 0.10 m	Without water	0.30	1.00149 ± 0.00023	0.7750
	With water		1.00149 ± 0.00023
	Without water	0.35	1.00155 ± 0.00020	0.1931
	With water		1.00158 ± 0.00019
	Without water	0.40	1.00164 ± 0.00018	0.0084
	With water		1.00170 ± 0.00016

For each case, n = 220 analyses were performed. P values were calculated using Student’s t test