Can I use IMAQ Extract Tetgraon (ROI) to extract an annulus?

[another_novice]

I saw this question was answered back to 2013, with the answer being to use the IMAQ Unwrap tool. Thing is, I don't want to unwrap. I just want a donut-shaped image. Has anything been added since 2013 to let me do this? (BTW, I'm using LV2015.)

[BrinkHombre]

Hello another_novice,

Have you taken a look at this KB, Specify Annulus as Region of Interest Using NI VAS? It has a link to an example VI identifying an annulus as the ROI. 

Also, the example VI's for the IMAQ Extract Contour VI could be a good starting place for identifying and extracting an annulus from an image. These don't specifically get the image to a donut-shape, but they demonstrate the tools that one could utilize to get there.

Best regards,

[another_novice]

Hi Ryan,

Great information. Thank you. I wish I'd had the ROI instructions years ago when I first started using LabVIEW!

I'll let you know how it works out for me.

Thanks again.

[another_novice]

The forum bot wants to know if my question was answered. I'll say yes although I didn't try it. I just decided to go with a masking approach instead as it seemed easier.

[BrinkHombre]

Phenomenal. Thanks for the update, another_novice.