11-03-2014 10:26 AM
Hi guys,
I'm using the Calibrate stereo vision.vi (NI Vision development module 2013) to calibrate my stereo vision system but I failed and I don't know why. My experimental setup is as follows:
2 aviator 1600gc cameras, with 16mm focal lenses and a baseline of 1 cm;
a calibration grid of 16*16 dots (dx=dy=4 cm), at a distance of 2 meters;
2 light projector of 500 W.
I followed the VI instructions and made a lot of trials for 2 days, but i never succedeed in calibration. More specific, in the grid coverage control i always obtain NaN %, as showed in the picture in the attachment.
In continued to acquire images as long as all gride coverage control below are all to 100% but the VI doesn't proceed into grid vertex calibration.
Can someone help me?
Thanks in advance
11-12-2014 05:03 AM
Hi Carlofeo,
I think the problem is that the calibration grid is too far from the cameras and the system doesn't detect the dots inside the grid.
I suggest you to obtain something like this to correctly calibrate your system: http://zone.ni.com/reference/en-XX/help/370281W-01/imaqvision/stereo_vision_example/
Hope it helps,
have a nice day!
FBM
11-26-2014 05:24 AM
Hi there,
I got exactly the same problem! I hope it's okay posting in this topic.
I followed the instructions on http://zone.ni.com/reference/en-XX/help/370281U-01/imaqvision/stereo_vision_example/ but my top grid coverage just won't show any values.
The grid is from the NI folder, so actually it should be okay.
cams: 2x DMK 23F618 from ImagingSource
lenses: 2x 8mm F1.2
Furthermore, at most attempts I won't even get any values at all.
Even if all points are detected it won't show any values. This mostly happens when I use external light sources (tried it with infrared and a common 20W halogen lamp running on DC)
I hope you can help me out here! Thanks
12-15-2014 02:38 AM
As I don't know how to edit my previous post, I'd just make a new one..
I found out that i kinda get some values when I turn on the Highlight Funktion in the Calibration-Manager.vi.
Means there is a timing problem, most certainly in this sub-vi! I'm not sure how to solve it yet though..
01-22-2015 09:00 AM
I manged to solve it:
Searching for the timing problem, it led me to the Calibration Manager (Init Case):
reprogramming the case as following solved the issue:
05-28-2018 07:33 AM
Hi Maxtur;
First of all, I want to thank you for your help. I have solved the problem in the Calibration Manager (Init Case) by programming the case as you mentioned. But now, I couldn't calibrate the stereo imaging system and pass to the next step (measurement). I have usually same problem at the grid covarage section. I set up a test bench for calibration and measurement. I have worked all day but I did not get a result.
Thanks for your kind interest,
Dr. Baris Ozluoymak