Image processing doesn't show

Hi!
I am trying to do image processing, where it will detect the object and box it up when detected. 
However, I did not manage to detect the object, which in this case, a masking tape.
Can anyone tell me what is wrong and how to solve it?
Below is the attached VI that I have done.
Attachments:
multicam+image processing.vi ‏106 KB

No. This is just for testing purpose. I don't have the actual image as it is for an obstacle in a competition.
However, the obstacle is also a ring as well. 
I just found a way to detect the object.
I used geometric matching instead of pattern matching, but it was able to detect other things such as my laptop as well.
Is there a way to detect the image and change the diameter of the ring so that it is able to detect other rings with a larger diameter?
Thanks for your help.
Attached below are the changes i have made and the images it detected.
Attachments:
multicam+image processing.vi ‏110 KB
correct image.png ‏455 KB
wrong image.png ‏499 KB

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