3.2.1 The monoscopic restitution: T

3.2.1 The monoscopic restitution: The monoscopic restitution
of the object was performed by means of PhotoModeler v5.2;
this software is very user friendly and characterized by a very
intuitive interface; in fact the operator is supported in the whole
project setup phase, and many are the tools at disposal, for
example the epipolar geometry that helps homologous points
collimation. Besides PhotoModeler offers the important option
of using in the same project images acquired by different
cameras; in our application this task was fundamental, because a
complete monoscopic object restitution couldn’t have been
possible without using also the non-metric digital images.
Certainly this software can be easily utilized also by operators
not endowed with a photogrammetry learning, even if offers
many final products useful to technicians, as vectorial drawning,
orthophoto and model in VRML (Virtual Reality Model
Language) format. On the whole, Photomodeler seems to be
particularly advisable for cultural heritage applications.
As said before, on the same photos were performed two
photogrammetric elaborations different for the exterior
orientation approach. In the first case, the exterior orientation
was performed by using control points and the process achieved
a global root mean square of 1.5 cm.
In the second case, it was adopted an easy and quick method to
obtain a not-oriented scaled object model without topographic
survey, based on the use of distance constraints directly taken
on the object. Figure 4 shows the PhotoModeler window to
define the distance constraints in the model scale arrangement.
The monoscopic restitution of some architectural particulars, as
columns and capitals, was very difficult, because working with
“flat” images, misses the stereoscopic effect necessary for the
reconstruction of curve surface; so for this objects has provided
for their modelling by special tasks of the software.
Actually PhotoModeler offers in these cases the possibilty of
defining spatial geometry on the base of operator defining
points.