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Caliper function in Vision Builder returns different values to LabVIEW

I am using the caliper function via the Vision Builder express in my LabVIEW code to measure the distance from two edges. However, the values that are outputted to my LabVIEW code are different than the ones resulting from the Vision Builder itself. Why is this the case? I have also used the calibrate function within Vision Builder to change the units from pixels to inches, but I don't believe this is what is causing the issue.

 

I was able to find some information about my issue in this post (http://digital.ni.com/public.nsf/allkb/9DF17D3BFCFDC1D5862573D700763E16), but I am using the function "Perpendicular projection" rather than "distance" for the calipers.

 

Any help would be appreciated!

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Hi djchou,

 

If you use the caliper function in Vision builder without the calibrate function, would you get a similar result? Also what is the difference between the two values? Is it very large or small?

Paolo F.
National Instruments
Applications Engineer
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