How to extract the lines from the image

Hi Everyone,
I have an Image. In that, a circle object (plastic material) placed at centre with dark background. When the light is allowed to propagate through the plasic ring, It is getting disturbed by the cut made in that. When light allowed to pass through, we can see some lines (via camera) in the plastic ring. Now I need to count the number of lines in the plastic ring programatically using Vision. How to start this ??? I m new here, so please treat me like a baby...
Find the sample Image below.
I am using NI Vision assistant & Labview 8.2.1.
Thanks in Advance
Attachments:
DSC_3017.JPG ‏165 KB

I followed the same procedure in Labview 8.2 and it doesnt work (Returns an error: Invalid ROI). Then I started the same programming in 2013 and its working good. I really dont know why ?????!!!!!!!!
Now the problem is different. After thresholding the image, it stays with some noise. I need to eliminate all and count the number of lines in the image. How to do that ???
Here I dont see any function like Threshold Detector like what BruceAmmons said.''
Refer the modified VI attached below.
Attachments:
IMAQ_lines_Modified.vi ‏51 KB

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