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The circle Hough Transform is a feature extraction technique for detecting circles. It is a specialization of Hough Transform. The purpose of the technique is to find circles in imperfect image inputs. The circle candidates are produced by “voting” in the Hough parameter space and then select the local maxima in the accumulator array.
Implemented Hough transform to detect free and occluded circles in an image in two ways using OpenCV library. • Detected circles by maintaining accumulator array • Detected circles by randomizing four points along the circle and approximate the radius.