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spacing of calibration sheets

The place for questions, problems, comments and tips regarding the camera calibration.

spacing of calibration sheets

Postby sourkraut » Wed Jun 03, 2009 8:59 am

Hi,
First off, thanks to everyone for the wonderful software!!

I am trying to scan a peice that does not fit inside the corner when using the 2 A4 calibration sheets. I do not have access to a printer that can print A1 either.
So I found pictures of setups where the calibration sheets have been moves away from the corner center.
I have set my corner up now with the edge of both sheets at 150mm from the corner center. I get a "calibration successful" but when scanning I get "laser too weak". The laser should not be the problem because I had really good results when I had both calibration sheets in the corner center. Another thing is when I get "calibration successful" the red x's are not on the black dots. They are in a random line pattern across the middle with green lines intersecting the black dots.
What settings do I have to change so that the program knows that the calibration sheets are not in the corner center?

Thanks!
sourkraut
 
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Re: spacing of calibration sheets

Postby MagWeb » Wed Jun 03, 2009 9:42 am

Hi, welcome

you´ve to modify he values in the calibpoints.dat file with a window setup.

http://www.david-laserscanner.com/forum/download/file.php?id=164&mode=view
simply add the value B to all the values that are not equal zero;
You can open the calibpoints.dat file, which is in your DAVID folder, using the normal WINDOWS EDITOR.

Gunter
MagWeb
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Re: spacing of calibration sheets

Postby BJ64 » Wed Jun 03, 2009 1:55 pm

Just a hint - back-up you calibpoints file before you go changing it.

You can always get a fresh one from the David site I suppose, but it's easier to resort to the backup once you've had a fiddle...

Just a thought,

BJ :)
BJ64
 
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