Real-time Hough Transform Based Circular Shape Extraction

In this paper, two circular shape extraction methods based on CAM (Content Addressable Memoy) concept are proposed. The first method based on Hough Transform uses only the gradient amplitude infonnation, while the second uses in addition preselected gradient direction to estimate the center coordinates of the circle and then apply the HT circle extraction to extract it's mdius. The advantages of both our propositions consist of their performance to keep low both the hardware amount, and the computation time for extraction of unknown, noisy circular shapes.