How to detect noisy broken ellipse
Message-ID:<5b3a0c69-ab77-40f4-ae80-fc740be54b6d@w7g2000hsa.googlegroups.com>
Subject:
How to detect noisy broken ellipse ?
Date:Fri, 12 Sep 2008 17:34:36 +0100
Can someone recommend software (preferably Matlab) that would detect ellipse in a noisy image ? I saw fit_ellipse on MathWorks but it just fits the best ellipse to whatever input it has, rather than selecting which input gives the best fit to the ellipse shape ... thanks !
Message-ID:<402aa7cb-ee4e-4fe6-a247-fcbba0546343@25g2000hsx.googlegroups.com>
Subject:
Re: How to detect noisy broken ellipse ?
Date:Fri, 12 Sep 2008 18:32:05 +0100
On 12 Set, 18:34, Leonwrote: > Can someone recommend software (preferably Matlab) that would detect > ellipse in a noisy image ? I saw fit_ellipse on MathWorks but it just > fits the best ellipse > to whatever input it has, rather than selecting which input gives the > best fit to the ellipse shape ... > thanks ! I think you should use a statistical method, like RANSAC, to select a good subset of your input _before_ fitting the shape.
Message-ID:<5158403a-01ca-4eb3-acc0-bf076b16845c@34g2000hsh.googlegroups.com>
Subject:
Re: How to detect noisy broken ellipse ?
Date:Sun, 14 Sep 2008 14:54:54 +0100
On Sep 12, 12:34=A0pm, Leonwrote: > Can someone recommend software (preferably Matlab) that would detect > ellipse in a noisy image ? I saw fit_ellipse on MathWorks but it just > fits the best ellipse > to whatever input it has, rather than selecting which input gives the > best fit to the ellipse shape ... > thanks ! Google "ellipse detection hough transform" There are lots of papers about dealing with this specific problem using the hough transform. Depending on how noisy your data is some of them are actually quite fast and simple :) Cheers, Davis
Message-ID:<814fed05-3d73-477f-a656-4ef2808510ef@m45g2000hsb.googlegroups.com>
Subject:
Re: How to detect noisy broken ellipse ?
Date:Mon, 15 Sep 2008 09:31:33 +0100
On Sep 12, 6:34=A0pm, Leonwrote: > Can someone recommend software (preferably Matlab) that would detect > ellipse in a noisy image ? I saw fit_ellipse on MathWorks but it just > fits the best ellipse > to whatever input it has, rather than selecting which input gives the > best fit to the ellipse shape ... > thanks ! As another poster has said, RANSAC is the standard method for doing this kind of thing, if not necessarily optimal. illywhacker;



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