Optical shape recognition with LabView

[Rainer E.]

Hi folks,
we have lots of BMP pictures of soap foam. By using the pics, we want to
recognize the foam Bubbles, count them and determine sizes.

I programmed lots of Labview apps in the past , but rarely used any
picture related VIs, so I don't have any idea, how to start solving this
problem.

Do you folks have any hints?

Thx,
Raner E.

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[paulmw]

This sounds like a good application for the vision development module (Vision Builder would work too).  In fact is sound very similar to an example that ships with the addon (counting size and shape of molecules in a slide image).  Unfortunately if you don't already own it it is not a cheap addon.

Alternatively, I think it would probably be a huge task to develop this with only the default labview picture controls and functions.  But there may be others who have done or attempted this and they would be able to give more advise on that topic.

[R.E.]

paulmw schrieb:
>This sounds like a good application for the <a href="http://www.ni.com/vision/software.htm" target="_blank">vision development module</a>&nbsp;(Vision Builder would work too).&nbsp; In fact is sound very similar to an example that ships with the addon (counting size and shape of molecules in a slide image).&nbsp; Unfortunately if you don't already own it it is not a cheap addon.
>Alternatively, I think it would probably be a huge task to develop this with only the default labview picture controls and functions.&nbsp; But there may be others who have done or attempted this and they would be able to give more advise on that topic.

Hi Paul,
thanks for the hint. I'm going to look at it more intesive tomorow, when
I'm at work again. There I have the full development system (academic
version) with labview and other stuff inside, which is more than I can
handle. I guess the vision software is included too.

Thx,
Rainer

[paulmw]

If you do have the vision software then you are all set and at a great advantage.  I don't have the vision software anymore so I can't get too detailed in my examples.  Just so you are aware, there is a machine vision discussion forum where you can post vision specific questions.

I would check out some of the examples that come with the vision development module.  If everything is installed correctly go to "Find Examples" under the help menu in labview.  Do a search for vision, and don't forget to check "Include ni.com examples" to see some additional examples.

[T-Route]

Raner,
A good tutorial for doing something simlar to this is shown in the Developer Zone and titled:

Counting Particles or Cells Using IMAQ Vision

If you have the Vision Development Module installed then the best way to experiment with these functions and work directly with your image is to use the "Vision Assistant".  This is located in your National Instruments Directory and titled Vision Assistant.  Good Luck.

Regards,
Mark T
Applications Engineer
National Instruments