Modifying VI - Vision Assistant

I have images that consist of an area of particles and an aera of no particles. I am trying to fit a circle to the edge, between the regions where there are and are not particles. I want to use the find edge tool, and I want to find the pixel where this transistion takes place for every row of pixels. For example, I want to draw a horizontal line that will give me the location of the edge then move down one row and repeat. I have tried using the find circle edge, but since I am trying to fit a circel to an edge that isn't well defined, I need a lot more data points to average over. I figure there is a way to modify the VI to perform the process I described above. Any help would be much appreciated. I have attached the images to give you a better idea of what I'm trying to do.
Attachments:
half circle.JPG ‏554 KB

Hi Windom,
If the find circle edge is not working for you, I would suggest thresholding the image. Then you could use the morphology functions (such as Close, Fill Holes, and Erode) to further manipulate the image to get a stronger edge between the areas of particles and not particles.
You can use a For Loop (initialized to start looking at the top of picture) and have it iterate vertically down the picture with the Edge Detector. You can do that by changing the ROI Descriptor for the line you are detecting edges with, and then you can read the Edge Information out of the VI. These all need to be checked in the "Select Controls" menu, which is found at the bottom right of the Vision Assistant window.
I hope this helps, let me know if you need any further clarification.
Best Regards,
Nathan B
Applications Engineer
National Instruments
Attachments:
SelectROI.JPG ‏12 KB
Edge Info.JPG ‏10 KB
SelectControls.JPG ‏14 KB

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Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

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https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

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Hi Recordpro,
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http://www.ni.com/white-paper/5651/en
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german translation:
Hallo zusammen,
ich bin leider noch nicht richtig mit dem Vision Paket vertraut. Ich möchte die Schwarz, Weiß und Grauwerte eines Bildausschnittes auslesen und diese auswerten können. Dank des Vision Assistant, kann ich dies per Mausklicks erzeugen, jedoch erhalte ich am Ende des Vis keine Daten. Selbst wenn ich die Quelle verbinde und ein Anzeigeelement hinzufüge, kommt hinten nichts raus. Was ist mein Fehler?
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Attachments:
Screenshot_VI.jpg ‏230 KB
Screenshot_Vision_Assistant.jpg ‏313 KB

Hallo Tropper,
vielen Dank erstmal für die Antwort.
Leider erhalte ich dennoch keine Ausgabe am Histogramm.
Das Histogramm wird mir leer angezeigt.
Ich habe es so erstellt, wie von dir gezeigt.
Attachments:
Unbenannt.jpg ‏117 KB

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Attachments:
PM_light.vi ‏266 KB

Hi all ,
i am using vision assistant to do patten matching . its able to find the pattern with created template in vision assistant .
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Attachments:
PM_light.vi ‏266 KB

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Attachments:
Untitled.png ‏7 KB

Hi Paolo,
Thanks for your answer. Yeah I have seen the examples and I´m familiar with the use of the OCR VI. I have use it a couple of time already with good results.
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Can you post a real jpg instead of renaming a bmp to jpg?

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uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13
Attachments:
Performance_test.zip ‏546 KB

Hmm Bruce, Thanks again for reply.
-When i first read your reply, i was ok. But after reading it multiple times, i came to know that you didn't check my code and explanation first.
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In both Vision Assistant and Labview
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Accounted in Labview but not in VA, because it is already in cache, But time to put the image into cache?
I do understand that, when we are capturing the image live from camera things are completely different.
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This is where i was very much confused. Beacuase i didn't even think of it. I am well aware of that task.
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Sorry, so far i haven't seen any example which does pattern match for multiple images has Setup Match Pattern everytime. But it is negligible time i wouldn't mind.
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Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

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https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

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Panel.png ‏3 KB

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> A have to say that the first solution is not my favorite because I tried to implement the TCP/IP communication in NI Vision Builder and it was function but the using of the server is limited.
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Modifying VI - Vision Assistant

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