Table 4.
The number of tie points and assessment of obtained accuracy for the CRP models of the concrete surface samples.
| Parameter | Sample Number | ||||
|---|---|---|---|---|---|
| P0 | P20 | P21 | P22 | P23 | |
| Number of photos | 31 | 32 | 26 | 23 | 22 |
| Number of tie points | 191,205 | 185,801 | 184,875 | 126,506 | 146,182 |
| Total error of markers in mm | 0.26 | 0.30 | 0.32 | 0.27 | 0.26 |
| Total error of scale bars in mm | 0.16 | 0.16 | 0.14 | 0.16 | 0.15 |
| Original density of point model of concrete sample surface obtained from CRP after cutting to the size of 110 mm × 110 mm (points/mm2)/(points/inch2) | 225/145,161 | 282/181,935 | 269/173,548 | 263/169,677 | 250/161,290 |