User manual

20 Chapter 2. Using IDEA
– Gain: allow to regulate the cameras’ gain;
– Clock: is the time setting of the cameras: a higher clock would signify a higher acquisition speed,
that if pushed beyond a certain threshold could saturate the USB2 bus;
– Frame rate: is the number of images acquired by the camera per second;
– Esp: regulates the exposure time, which is the interval, measured in milliseconds, in which the
sensor of the camera integrates the light: the higher the time of exposure, the brighter will be the
image but the acquisition speed of the camera will be slower.
(a)
(b)
Figure 2.5: Setting of the position of the cameras on the support bar.
To regulate the scanner functions one must carry out the following operations:
• straighten the cameras and use the auxiliary bar to move them so that the notch on the supports coincide
on the one on the bar, which should match the chosen framed area (ref. Figure 2.5);
• switch on the projector, with the power button, and turn on the live view; the projector will cast a black
line in the center of its projection pattern; orientate the scanner so that the black line is placed between
the two main circles of the calibration plate (ref. Figure 2.6); set the projector’s focus so that the black
line is sharply projected;
• orient the cameras so that they frame the black line of the projector in the center of the crosshair as in
Figure 2.6. The cameras will so form a triangle that constitutes the base of the triangulation principle
used for 3D scanning (ref. Figure 2.7); once finished regulating, tighten the screws that fix the cameras
to the support bar.