Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques

Table 2

Autofocusing experiment result.

Measurement times	Figure 12(a) river and tree			Figure 12(b) city			Figure 12(c) suburb
	(mm)	(mm)	Error (mm)	(mm)	(mm)	Error (mm)	(mm)	(mm)	Error (mm)
1	61.372	61.355	0.017	61.333	61.355	0.022	61.372	61.355	0.017
2	61.379	61.355	0.024	61.343	61.355	0.012	61.334	61.355	0.021
3	61.326	61.355	0.029	61.368	61.355	0.013	61.341	61.355	0.014
4	61.371	61.355	0.016	61.361	61.355	0.006	61.339	61.355	0.016
5	61.346	61.355	0.009	61.366	61.355	0.011	61.36	61.355	0.005
6	61.381	61.355	0.026	61.338	61.355	0.017	61.377	61.355	0.022
7	61.367	61.355	0.012	61.366	61.355	0.011	61.342	61.355	0.013
8	61.341	61.355	0.014	61.367	61.355	0.012	61.348	61.355	0.007
9	61.363	61.355	0.008	61.34	61.355	0.015	61.371	61.355	0.016
10	61.342	61.355	0.013	61.368	61.355	0.013	61.376	61.355	0.021
Average	—	—	0.017	—	—	0.013	—	—	0.015