Figure 1.
Cameras' position as resulting from extrinsic calibration.
X, Y, Z axis are represented and each camera coordinates along axis are reported in [mm]. Each camera is identified by a number. Orange crosses correspond to additional infra-red illuminators that were not employed in visual hull reconstruction procedure.
Figure 2.
Example of background subtraction procedure: on the left side one frame from one of the acquired video sequences is reported: above subject with markers and below results of background subtraction.
On the right side 4 views of the same grey-scale video sequence from 4 different cameras has been reported.
Figure 3.
From left to right: tracking of the model as obtained from a static trial; scheme of the model kinematic tree (each arrow point from “parent” segment to “child” segment).
Figure 4.
Global reference system, and technical reference systems for marker-based (left) and markerless techniques (right).
Figure 5.
Example of nine iterations of the articulated-ICP algorithm for matching of the model (yellow) to visual hull data (green).
Table 1.
Description of root mean square distance (RMSD) values between angles calculated with the two techniques (markerless (mkl) and marker-based (mb)); mean, standard deviation (SD), minimum (Min) and maximum (Max) RMSD values are reported.