How to detect rectangular lines in image

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itai
itai 2017-4-5
Hi,
I have a tiny rectangular component (I have attached the image) and I would like to find his contour for find out his misalignment. I tried use edge detection but the results I got were not good enough, I am interested in maintaining the outer contours of the rectangle and not altering them during the detection process. Please help me.
Thanks, Itai

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