IMAQ Calibration

[Rik_nz]

Hi,
I've looked at the calibration examples and I think I'm doing it right - but the "corrected" images I get are really awful.
I used 2 calibration grids (one with bigger spots), which shows a slight fish-eye distortion, and to test the calibration process I tried to correct the other grid, and then tried to correct the same grid - and both give similar results ... a truly distorted image, especialy at the edges (the parts that really need to be corrected).  I used bmps, but just to check I tried png format - no change in result.

Could someone please look at this sample and help me out.  The images are included.

[BruceAmmons]

Your problem is your threshold level.  Your image has uneven lighting, and the edge dots are not thresholding properly with the default settings.  I changed the upper limit from 128 to 100, and it works fine.

Another option would be to use dynamic thresholding on the image before running the calibration routine.

Bruce

[Rik_nz]

Thanks Bruce, works just fine now.  Isn't it easy when you know how 🙂

Cheers

Richard