Measuring distance between points

[novastar15]

Hey,

I am trying to do 2-D particle tracking.  What I am trying to do is for each point in the image, I want to find the shortest distance to anouther point. Repeat for each point.  Then move on to the next image and then compare those distances, since the particles are moving slowly, to help keep tabs on the particle.  So for example if it was at least 15 pixels away from the nearest particle in picture one, that should stay about the same in picture two.  However I am having trouble trying figuring out how to find the closest particle to every particle.  I am open to other suggestions as well for 2-D particle tracking.\

[Megan B.]

Hi novastar15,

What software are you using to process the images?  NI Vision software for LabVIEW?

Thanks!
Megan B.
National Instruments

[chrisger]

hi there,

i wrote a little vi (see attachment), but ist not tested.

best regards

chris

[novastar15]

Thanks,

I got something that appears to be working but not the most efficent piece I have ever done.  The vi you posted looked good.  And I am  using the vision package to find the centers.  Though it appears I need to refine that some more since over the course of a 30 second video all the centers go missing at least once.