Is it possible to use IMAQ Vision to realize the measurement of the size of 3-D object?

[nongnong]

I want to measure the size of  a simple 3-D object by LabVIEW. So I want to make sure of if the IMAQ Vision could complete this task.

If can, what is the main princliple/method?

Besides,I want to know how to realize the sampling of the object(2-D) by IMAQ Vision and LabVIEW.

Thanks very much!

[GuenterMueller]

Measuring the size of e.g. a cube is a simple issue if you use 2 cameras and inspect the cube from 2 views (90 degree setup of the cameras). That way you can easily measure in 3D as you go back to 2D - and of course you can easily program the software with IMAQ Vision. Depending on the object under inspection you could also succeed with only one camera: Again a cube is a good example. Simply position a camera on a cube's corner and you can measure 3D. 

If your optical setup provides good contrast you can simply apply an Edge Detection that comes with SubPixel Accuracy.

[nongnong]

fisrt, thank you very much to help me!

well, if i want to measure some complex objects,not so simple as cube, how to do?

[GuenterMueller]

Would you please give this forum an idea what you expect to do? If not, the best recommendation I can give is to have a look at the lots of articles and books that handle image processing.

[nongnong]

well, i want to measure the size of a cuboid. if i use the method you suggested above,it's ok.

but if possible, i'd like to realize the reconstruction of the 3-D object and show it on the LabVIEW panel.

it means that i expect the method can not only be applied in cuboid measurement,but also in other objects.

[GuenterMueller]

With Edge Detection you can detect the outline (contour) of any object from any view and reconstruct the object accordingly, isn't it?

[nongnong]

Yes,it's right.

But is the VI also suited for 3-D objects?  all of the examples I saw are about 2-D objects.

[GuenterMueller]

Edge Detection works on 2D images. It up to you to add "some math" around the Edge Detection and create the 3D logic.

[nongnong]

The problem is that i don't know how to add "some math" to solve the problem.

can you give me some examples about this?

[GuenterMueller]

I have been working on a similar problem in 1997. Two cameras were in use in that project. But the LabVIEW VIs are under copyright of our customer. Therefore I cannot provide any help by simply delivering the source code. 

Another issue is that I do not want to provide that exhaustive help in a forum.

Maybe you are interested in a proposal by our company? We provide startup assistance for many industrial projects on a wages per hour basis.