Description: HOUGHCIRCLES detects multiple disks (coins) in an image using Hough Transform. The image contains separating, touching, or overlapping disks whose centers may be in or out of the image.
Syntax houghcircles(im, minR, maxR); houghcircles(im, minR, maxR, thresh); houghcircles(im, minR, maxR, thresh, delta); circles = houghcircles(im, minR, maxR); circles = houghcircles(im, minR, maxR, thresh); circles = houghcircles(im, minR, maxR, thresh, delta);
Inputs:  im: input image  minR: minimal radius in pixels  maxR: maximal radius in pixels  thresh (optional): the minimal ratio of the number of detected edge pixels to 0.9 times the calculated circle perimeter (0<thresh<=1, default: 0.33)  delta (optional): the maximal difference between two circles for them to be considered as the same one (default: 12); e.g., c1=(x1 y1 r1), c2=(x2 y2 r2), delta = x1x2+y1y2+r1r2
Output  circles: nby4 array of n circles; each circle is represented by (x y r t), where (x y), r, and t are the center coordinate, radius, and ratio of the detected portion to the circle perimeter, respectively. If the output argument is not specified, the original image will be displayed with the detected circles superimposed on it.
License: Shareware Related: Difference, considered, c13dx1, x1x2 2b y1y2 2b r1r2, c23dx2, default, ltthreshlt, times, detected O/S:BSD, Linux, Solaris, Mac OS X File Size: 10.0 KB Downloads: 256

