Extract annulus ROI and change to array

[Gary1wang]

Hi Guys 

I am trying to extract a small annulus portion of image and change the extracted image to array for processing. I only found the Imaq VIs that can only extract rectangular. Is there any way to extract annulus shape image and change the extracted  to array.

What I made the annulus region of interest is inner radius=0, angle=0 and end angle=0, which forms a circle. 

Thanks  

[BruceAmmons]

Try IMAQ Unwrap.  It converts an annulus to a rectangular image.  It is intended for OCR, but works fine for other things.

You might have a problem with a zero inner radius, because there is nothing there to unwrap.  You will get the same pixel stretched all the way across the bottom of your image.

Bruce