The range data acquired by BIRIS camera were proces 
sed through a software for 3D virtual model genera 
tion, developed by Image Processing Group at Univer 
sity of Padua. An example of resulting 3D model is 
depicted in Figure 8. Along with such VRML file, the 
processing software produced an ASCII output file by 
which, still using Surfer, the corresponding DEM was 
extracted (Fig. 9). 
The results are reported in Table 1, in which the diffe 
rences between only 45 points for brevity sake are 
listed. Since the measurements were carried out in two 
different reference systems, a coordinates transforma 
tion was performed through a tool of OrthoEngine 
software in order to make the comparison between 
values referred to the same coordinate system. 
Fig. 8 : The VRML output of BIRIS camera. 
4 DEM COMPARISON AND RESULTS 
In order to evaluate the accuracy of BIRIS camera for 
3D object model generation, the DEM extracted with 
this laser scanner system was compared with that 
obtained by digital photogrammetry triangulation. 
Table 1 : DEMs comparison results (values in mm) 
P о in ts 
AX 
AY 
AZ 
1 
0,1 06 
0.1 1 5 
0.1 78 
2 
0,31 4 
0,245 
0,309 
3 
0.1 77 
0.254 
0.1 70 
4 
0,278 
0.254 
0.240 
5 
0.1 55 
0.1 38 
0.1 00 
6 
0,079 
0.1 23 
0.1 40 
7 
0.1 72 
0.254 
0.247 
8 
0,246 
0.293 
0.262 
9 
0,1 47 
0,1 67 
0,1 70 
10 
0.1 63 
0.224 
0.240 
11 
0.1 90 
0.208 
0.086 
12 
0.278 
0.293 
0.31 6 
13 
0,225 
0.247 
0.237 
14 
0.21 0 
0.21 1 
0.237 
15 
0.263 
0.281 
0.269 
16 
0,285 
0,232 
0,278 
17 
0.085 
0.1 39 
0.1 07 
18 
0,240 
0.279 
0.263 
19 
0.1 72 
0.1 93 
0.1 65 
20 
0.1 72 
0.1 53 
0.1 60 
21 
0.086 
0.1 45 
0.1 08 
22 
0.1 24 
0.1 67 
0.1 46 
23 
0.1 38 
0.1 49 
0.1 67 
24 
0.1 25 
0.1 45 
0.1 78 
25 
0,458 
0,479 
0,425 
26 
0.345 
0.246 
0.299 
27 
0.426 
0.379 
0.458 
28 
0.424 
0,426 
0.458 
29 
0.1 25 
0.1 45 
0.1 75 
30 
0.246 
0.275 
0.248 
31 
0,346 
0.358 
0.298 
32 
0,31 6 
0,343 
0,350 
33 
0.432 
0.423 
0.41 5 
34 
0.31 2 
0.342 
0.346 
35 
0.41 2 
0.451 
0.487 
36 
0.376 
0.288 
0.352 
37 
0.354 
0.346 
0.379 
38 
0,265 
0,31 5 
0.278 
39 
0,423 
0,434 
0,463 
40 
0.467 
0,432 
0.41 4 
41 
0.435 
0,445 
0.482 
42 
0,41 2 
0.291 
0.352 
43 
0.322 
0,346 
0.379 
44 
0.246 
0,275 
0.235