A novel circle detection method using Radon transform
Honghong Peng, Raghuveer Rao · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2008
A circle detection method utilizing Radon transform is proposed. In this paper, a closed form solution for the Radon transform of a circular structure is derived from the Radon transform of a round disk. Because the Radon transform of circle has the unique property of invariance to the angle change, a universal matched filter can be constructed from the Radon transform of circle. To detect if there is a circular structure of specific radius presented in the image, a pre-defined matched filter is applied to the Radon transform of the image at all angles and a circle presence intensity image is reconstructed from the filtering results through filtered back projection (FBP). By thresholding the circle presence intensity image, the presence and the location of the circle can be easily determined. The preliminary experimental results show that the proposed method is effective and has better signal to noise ratio in output compared to the typical Hough transform approach.