Rectangle

How to detect rectangular images inserted into another image?

How to detect rectangular images inserted into another image?
  1. How to detect rectangle in an image?

How to detect rectangle in an image?

Find the approximate contour for each of the contours. If the number of vertex points in the approximate contour is 4 then we compute the aspect ratio to make a difference between the rectangle and square. If the aspect ratio is between 0.9 and 1.1 we say it is a square else a rectangle See the below pseudocode.

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