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Wiimote Project » Forum » Wiimote Projects » Wiimote Interactive Whiteboard » calibration functioning
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mastercana
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« on: December 01, 2008, 03:52:22 PM »
Hello I'm a french student and this year, in my classroom, we have to prepare a "TPE", a survey, a kind of overview ( sorry if my english isn't wery well, I'm just 16 years old ^^)

My subject is the wiimote whitboard and we have to explain the working (how the computer know were is the pointer ? ).
My question is : How the calibration is working ?Why we have to do this before using the whitboard ?


Thanck you !!   =)
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dice
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« Reply #1 on: December 02, 2008, 01:03:59 AM »
Calibration of wiimote whiteboard

Reason for it:
The wiimote most likely has a wider field of view than the surface (projected area) has.
Let me try to show you in a picture.



as you can see all you want to use the Mouse/IR Pointer on is the area where the project or displayed image is.

I hope this explains it.

Dice
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mastercana
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« Reply #2 on: December 02, 2008, 02:52:53 PM »
Thank you very much for your answer !
But my question was more  Grin : about the calculations made in relation to the 4 initial points .
Once the 4 points have been found we know the distance between the 4 points (proportionally to the projected image -if I've  understood well Angry -) ; how do we know the position of any point on the board ? (how do we calculate it ?)

thanks  Cheesy
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UndCon
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« Reply #3 on: December 02, 2008, 03:54:52 PM »
If you try BoonJin's Smoothboard you will see clearly how much of the working area that is calibrated



(the parially white area)

Exactly how it works (in code) is something I have to look into
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ujs
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« Reply #4 on: December 03, 2008, 10:24:00 AM »
Read these threads/posts:

http://www.wiimoteproject.com/wiimote-whiteboard/math-behind-projection-rectification/
http://www.wiimoteproject.com/wiimote-whiteboard/calibration/msg1668/#msg1668

Uwe
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mastercana
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« Reply #5 on: December 04, 2008, 12:08:48 PM »
thanks !!

i've to read it ^^
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