On Fri, Aug 10, 2001 at 03:34:26PM +0200, Tobias Benedikt Hoevekamp wrote: > Hi there, > > I am wondering, if there is a script around, that would > automatically analyze particle sizes. Enclosed is an > image of a typical problem: several (sometimes even > overlapping) more or less spherical particles are given. > I am interested in a script that finds the number of > spheres and their diameters. > > Best regards, This is more complicated than one'd normally expect from an image manipulation program, but a possible way to go might be to edge detect, threshold, dilate a few pixels, erod a few pixels (gets rid of some noise), and then use something like a circular Hough transformto check whether a point is a good estimator of the centre of the circle (this will also give radius estimators), and then count them. The first few stages of that could definitely be done in the gimp, but you'd be on your own for the complicated part (the Hough transform, which is described in (among many others) "Image Processing, Analysis and Computer Vision" by Sonka, Hlavak and Boyle). But as with all reasonably complicated image processing (automated counting of objects is complicated, I'm afraid) there are many approaches. You might try one or more of the image analysis/processing newsgroups for more help. Cheers, Dave. -- .------------------------------. / David Neary, \ | E-Mail dneary@xxxxxxxxxx | \ Phone +353-1-872-0654 / `------------------------------'
