Fig. 8From: Line and circle detection using dense one-to-one Hough transforms on greyscale imagesComparing different algorithms for circle detection. The 40 best circles are displayed. (1) and (3) operate on the contours, (2) and (4) on the grey level. For (1) and (2), one single plane from the 3d transform is shown (plane of equation r=25). For (3) and (4) is shown the 2d transform corresponding to the output of the first pass (centre localisation)Back to article page