Find the Circle

[Brzhou]

Hi Sir, 

Why not able to find the circle, but also did not report any error ?

Thanks.

[altenbach]

Are you sure this is a LabVIEW problem?

[Brzhou]

Hi Sir, 

I am not sure, just because i am learning vision, try to understand how to find the circle.

Thanks.

[altenbach]

There is a special forum dedicated to vision. I can move this thread if you want.

[Brzhou]

Hi Sir, 

Please help to move it, because i have not find it, and want to discuss some topics of vision with veteran.

[NIquist]

The reason it can't find a circle is because you didn't tell it where to look.  You need to define an ROI (Region Of Interest) and set up the rest of the parameters for the analysis you desire.

Vision Builder is pretty easy to use.  You have to read the manual though.  There are good tutorials on-line too.

[Brzhou]

But you know, i use vision assitant, the same flow, just the different pic, it is fine to detect the circle.

That why i feel strange, for the two pics, more or less the same, just the different size.

Thanks.

[Brzhou]

After i generated the vi code, it is still fine to get the circles, but the coordinate is not there, not sure why ?

Thanks.

[NIquist]

I haven't used Vision Assistant or Builder for a long time and don't have a license anymore, but I do remember having to prepare an image for metrology by doing things like removing the color, changing the contrast, defining ROI, etc.  The whole point is to modify the image so that the detection and measurement algorithms are not confused by reflections, shadows, etc.  I also remember that lighting was very important to get consistent results.  It was pretty easy though after I studied the tools.  Have you read through the manuals and taken some tutorials?  It's important if you want good results.

[Brzhou]

Have not learn it systematically.

Just sometimes, thinking about the real scenario in the work, then how to fullfill it by vision.

Thanks.