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How to detect square in a video using c++ and opencv?

I want to build an program that can detect square shape object in a video. i used SURF algorithm for that. but that only detect key points.

How to detect square in a video using c++ and opencv?

I want to build an program that can detect square shape object in a video. i used SURF algorithm for that. but that only detect key points.

How to detect square in a video using c++ and opencv?

I want to build an program that can detect square shape object in a video. i used SURF algorithm for that. but that only detect key points.points.i want to detect square shape objects which are situated near the road. As a example road signs. the program simply check whether the frame that taken by camera (which is putting inside the vehicle) has square sign or not.(if that frame has square shape object then frame is sent to next function, else delete that)