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Machine Vision

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centroid resolution

Hello,
I have the developer suite w/vision.

Using the Centroid VI, what is the sub pixel resolution I'd hope to get?  I expect the image of the circle to have slight rolloff as a function of the imaging application (not a well defined circle); this should help increase the data set.  I would expect the resolution to increase as a function of the circle size relative to the detector's pixel pitch.  Is there a rule of thumb to figure this out ?

 

Beyond thresholding and masking out background image, is there another VI or approach that could increase resolution over the centroid VI?


Thanks

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Hi cheeseburger,

 

The link below provides the equation that IMAQ Centroid is using.

 

How Does the IMAQ Centroid VI Work?:

http://digital.ni.com/public.nsf/allkb/4F4947441856350B86256B3E0074FD39

 

I hope this helps!

 

- Kale

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