![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/189262/image.png)
Find all rectangle(or another shape like circle, square, and triangle) in image
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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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191271/image.png)
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![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191272/image.png)
Noise Rectangle 1
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191273/image.png)
Noise Rectangle 2
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191274/image.png)
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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.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/189262/image.png)
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