how to take circle attributes seperately

[sevincom]

Hello all,

I need to group the attributes(like radius, center x, center y) of circles from IMAQ Detect Circles function. For instance, all of the y positions need to be grouped in an array. I could not seperate them.

I tried a few things to do that. I'm adding my last try as attachment. Because I am new at Labview it may be not a good way. If it is not a good way to do this task, I would be pleased to hear different methods or modifying the VI would be appreciated 🙂

[TJWhit · Accepted solution]

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@omersevinc wrote:

Hello all,

I need to group the attributes(like radius, center x, center y) of circles from IMAQ Detect Circles function. For instance, all of the y positions need to be grouped in an array. I could not seperate them.

I tried a few things to do that. I'm adding my last try as attachment. Because I am new at Labview it may be not a good way. If it is not a good way to do this task, I would be pleased to hear different methods or modifying the VI would be appreciated 🙂

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The IMAQ Detect Circle vi returns an array of clusters. Each cluster contains a position cluster with X and Y information (single precision float), the radius (double precision float), and the score (double precision float). You can separate these out by first getting a single element from the array. In the snippet below, I use an indexed tunnel in a For Loop to do this. Then use the Unbundle by Name function to separate the three elements of the cluster. You'll need to use the Unbundle by Name function again to pull out X and Y from the Position Cluster. Then just run all values out of the For Loop with an indexed tunnel and you have it. Hope this was what you were looking for.

Regards,

[mikeporter]

Actually, the second unbundle by name is not needed. Clusters within clusters can be unbundled directly.

Mike...

[sevincom]

Thank you both for your helps. I did it like you explained.

I don't know do I need to open a new topic but now I have another problem with circle detection. As you can see from the image, I have only 6 circles. But the function detects 12 circles. It detects each circle twice with small differences. What should I do to constraint the second detections?

[GerdW]

Hi omer,

in your picture I can see 12 circles: 6 black ones overlaid by 6 white circles… 😄

[sevincom]

GerdW,

You are right  but I need to detect only the black ones

[GerdW]

Hi omer,

group the circles by their XY coordinates and choose the bigger one of each pair…

[sevincom]

GerdW,

I was looking for an option like find best edge in VBAI but sorting also works for now 

Thanks for your help.