Particle Detection - Location of Detected Particle XY Pixels

[MrJackHamilton]

I am attempting to perform spot tracking for a beam aiming system. I need help with the "IMAQ Particle Analysis' function. I reviewed the examples, and none seem to demonstrate extracting the XY pixel location [Centroid] for a detected particle.

I coded an still image of my beam - and the particle analysis reporting does not correlate to the clearly 'seen' location of the beam - i.e. the only singular particle of the sample image. Some of the reporting seems correct - Hydraulic diameter - but the XY boundary - keep returning the entire image field boundaries?.

I have attached my test VI, a BMP of the captured image. Any help is appreciated. My Vision Acquisition, Analysis license is activated.

[1100fps]

if it's reasonable to convert the image into a binary, easy to filter  out outliers, and use the same tool to find the center of mass of the particle. 

Does this make sense?

[MrJackHamilton]

If the particle detection function worked at all...I would invest the time.

Looking at the image, it's pretty much binary now. 

There has to be something wrong in how I am using the function.

This is the help I am looking for.

[1100fps]

The image has to be binary.

[MrJackHamilton]

Thanks! Yes I figured that out. Odd...there is not error returned from the function, and odder still it reports 'detecting' one particle...

I will upload the vi I posted with the binary conversion..

Thanks, Jack

[1100fps]

I wrote a more detailed explanation, but the system decided to kick me out, and I'm too tired to write it agin.  But I have attached a VI that does a fair job of locating the center of mass..

Oh, Calibrated values will always be the same as pixel values, unless you have a calibrated image.

Cheers

Robert

[MrJackHamilton]

Robert,

Thanks!....I've had the same issue with writing a long Forum reply to be booted off a refresh.

Jack

[1100fps]

I hope the code makes sense. .Feel free to bug me if you have more questions.

Cheers

Roebrt