MATLAB Answers


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

Asked by Junwon Park on 15 Jun 2018
Latest activity Edited by Junwon Park on 15 Jun 2018


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.



Noise Rectangle 1

Noise Rectangle 2


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1 Answer

Answer by Image Analyst
on 15 Jun 2018
 Accepted Answer

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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