Machine Vision

cancel
Showing results for 
Search instead for 
Did you mean: 

two point image calibration calibration in labview.

I need to do two point image calibration  calibration in labview. 

using run labview step.  

both pixel and real world values are from config file. 

How to do two point calibration?

0 Kudos
Message 1 of 4
(4,286 Views)

Hello,

 

you can use "Set Simple Calibration" to specify simple pixel-to-world mapping. But if you have perspective distortion, you would need at least 4 points to compute pixel-to-real world mapping (homography - https://decibel.ni.com/content/blogs/kl3m3n/2015/04/24/homography-mapping-calculation-labview-code):

 

Could you explain the problem more clearly?

 

Best regards,

K


https://decibel.ni.com/content/blogs/kl3m3n



"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."
0 Kudos
Message 2 of 4
(4,264 Views)

Hi klemen,

 

Thanks a lot for your reply.

 

i need to do 2 point calibration .

 

from my  motion system.  Here i have only X axis .. so i can specify x distance only y will be zero .

 

(X1,0)  (X2,0).

 

so i need to calibrate my image using 2 points. 

 

pixel value and x location .. i read from my motion system.

 

i just pass those points and real world values.

 

..

 

I dont know how to do .. do you have any example file ?

0 Kudos
Message 3 of 4
(4,258 Views)

Hi ,

 

i got it How to calibrate 2 points in Set simple Calibration.

 

Thanks.

 

 

Before i use Set Simple calibration i need to do some calculation (Pixel /mm).

 

after that i feed into that function ..

 

 

0 Kudos
Message 4 of 4
(4,228 Views)