Find all rectangle(or another shape like circle, square, and triangle) in image

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Junwon Park
Junwon Park 2018-6-15
编辑： Junwon Park 2018-6-15
Hi.
I want to fine corners of rectangle in images for tracking changing coordination. For this, i think that find edge and corners of rectangle first.
How to find all rectangle's outline.
I attached 2 images. The attached image have 40 rectangles. I want to get "40". However, the image have noise. How to i get target's exactly number.
Please, help me.
Thanks.
.
Noise Rectangle 1
Noise Rectangle 2

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Image Analyst
Image Analyst 2018-6-15
Find the red stuff using color segmentation. Then erode the mask to separate the squares. Then examine each blob to see how many vertices it has and determine if it's a square, triangle, pentagon, or whatever. See attached demo.

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