I have a calibration dot pattern and interested in knowing the distance between dots.

[M_T]

I have a calibration dot pattern from NI to be used for calibration of a analog camera using NI vision.  I have been prompted to give the distance between dots, and I don't seem to have this number.  The dots appear to be approximately a 1/4 inch in separation from each other.  Where can I find this calibration information at NI?

Thank you in advance for your time and consideration in this matter.

[Luke H]

M_T,

The dot pattern you are looking for should be installed under Start » Programs » National Instruments » Vision » Documentation » Calibration Grid, but I've also attached it to this post. This is a pdf document used for calibration of your image acquisition. Since this a pdf, it may print out at slightly varying sizes depending on scaling and printer margins. As far as I know we do not have a specific standard size between these dots.

You should be able to empirically determine the distance between the dots on your specific sheet of paper. If you need more precise measurements, you should be able to make your own calibration grid in Microsoft Word. I've attached one that I made up pretty quickly with a little copying and pasting. This one has a half inch between dots in both directions.

There is more information about calibration in the Vision documentation that installs on your computer. I find the easiest way to get Vision documentation is to go to Start » Programs » National Instruments » Vision » Documentation » Search the NI Vision Bookshelf. This document will give you access to all the Vision documentation on your system. Searching for the word "Calibration" in here returns many useful results.

Regards,
Luke H

[AnalogKid2DigitalMan]

Caution:

Don't stare at those dot patterns too long, they will make you eyes go bonkers!

[M_T]

Thank you that worked, very easily.