Annulus ROI to array

[Tokyghy]

Hi,

I've been trying to convert an annulus ROI to a 2D array , but no success, 

does anyone know how can I do this? I can do this with rectangle ROI but this will not work for what i want to do.

The purpose of this is to compare 2 images one is a reference image and the other one is taken by a cam.

any solutions will be appreciated

Thanks!

[LVbum42]

Hello,

Do you have any example images? What sort of comparisons are you trying to make?

[Tokyghy]

Yes i have some pictures and the code Im developing

hope this can be useful for you to help me

Thanks!!

[Tokyghy]

Hi any solutions??

Ive been searching for this around the web, but no specific answers

Thanks !

[GregSands]

I can't tell exactly what you're trying to do, but just looking quickly at your code - I think you're defining an Oval ROI, rather than an Annulus (which is a donut-shaped ring), and the ROI To Annulus VI will return nothing in that case.  If you need the enclosing rectangle, you should directly access the Global Rectangle of your ROI, without needing to call another VI to get it.  Does that do what you want?

[kloram333]

I'm having a similliar issue. I want to select an oval ROI on two different Images and subtract them. I can only get it to work if I use a rectangular ROI. I've tried a lot of different things to fix the problem but nothing has really worked. Let me know if you find any solutions!

Kate