# Wiimote Project

### Author Topic: calibration functioning  (Read 5825 times)

#### mastercana

• Posts: 4
• Karma: +0/-0
on: December 01, 2008, 02:52:22 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 !!   =)

#### dice

• Posts: 441
• Karma: +18/-0
Reply #1 on: December 02, 2008, 12:03:59 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

#### mastercana

• Posts: 4
• Karma: +0/-0
Reply #2 on: December 02, 2008, 01:52:53 PM
But my question was more  : 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 -) ; how do we know the position of any point on the board ? (how do we calculate it ?)

thanks

#### UndCon

• Posts: 566
• Karma: +11/-3
Reply #3 on: December 02, 2008, 02:54:52 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

#### ujs

• Posts: 134
• Karma: +10/-0
Reply #4 on: December 03, 2008, 09:24:00 AM

Java WiimoteWhiteboard for Mac OS X, Windows and Linux.

#### mastercana

• Posts: 4
• Karma: +0/-0
Reply #5 on: December 04, 2008, 11:08:48 AM
thanks !!