3.2
Positioning and the first camera calibration
The positioning and the first calibration of the camera must be done during the
initial launching the system. The procedure should be repeated in case of the computer
change and/or the camera position change.
To conduct the first setting and the camera calibration the user must follow the
following steps:
STEP 1: Camera positioning
The camera should be located in a way to “see” the whole working
area – that means the picture displayed by the projector. The
EduTool
application will help by giving coordinates of the electronic
pen read from the camera in the range from 0 to 9999 both vertically
and horizontally.
Firstly,
turn off
the mouse mode to read the position of the
electronic pen (without moving the mouse cursor). To make it the
user should remove the marking of “Move mouse cursor” option in
the menu of the
Camera Settings
window:
Now, moving the electronic pen (with the button pressed) the user
can define the camera working area. The electronic pen movement
will be reflected by co-ordinates change [
Internal coordinates
]. It is
enough to check the visibility (response for pressing and depressing
the button of the pen) in every corner of working area. Moving the
electronic pen out of the camera's view will cause stopping the
changes of the cursor coordinates and no reaction for pressing the
button of the pen.
Hint
: sometimes it is more convenient to trace camera light instead
of coordinates. During pen visibility camera lights in green-yellow
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