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2.2 Pocket change: circle recognition

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A description of the process by which to determine the center and radius of each circle.

Given an image, the first step is locating the coins in the scene. Only then can you make a comparison.

Many different methods are available for finding circles in images. Initially, you might want to try edge detection on the image and then code an algorithm that would, based on thelocated edges, determine the center of the circle. However, you will find that circle recognition is a commonly performed task withestablished algorithms. For our project, we found a user friendly circle location Matlab function that implements the Circular Hough Transform in the MATLAB code repository.

For more information about the Hough Transform you can go here .

Once you have the radii and centers of the circles, you can then move to coin identification.

Questions & Answers

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Source:  OpenStax, Elec 301 projects fall 2006. OpenStax CNX. Sep 27, 2007 Download for free at http://cnx.org/content/col10462/1.2
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