Re: correction : ts calibration

Hello,

> The matrix can also be used the other way around: generate it from the 5
> calibration points. Random point (with a mininum distance of course) can
> be used to calibrate it further. I will look into such a system next
> week or so (I'm away this weekend and have some deadlines next week). If
> you have access to a program like Maple or Matlab you could test some
> stuff.

Yes I'm using maxima which does the same things that maple. I was necessary for the
matrix computation.

For better understanding the value given by the touchscreen. I have got the
raw values when the pen follows the borders of the screen.
It gives this :
http://alain2210.free.fr/geombrut.pdf
I show that there is no problems with the x values but it's more harder with the
y ones.
A linear or projective transform is not sufficent.

Sincerly,

Alain
Received on Fri Apr 16 2004 - 14:21:53 EDT