MATLAB >> Circle Detection using Hough Transform

by Armin » Sun, 30 Oct 2005 12:34:41 GMT

Hi,

How to detect circles of radious minimum radius 25 to max radius 30
in hough transform. Have problems understanding how to detect even
one circle of say atleast 25 radius. Is there any one where one can
guide me to the algorithm or explain how to do it.

Cheers,
Armin

MATLAB >> Circle Detection using Hough Transform

by Gaven » Fri, 20 Jan 2006 20:50:31 GMT



any idea on this problem?

gaven

MATLAB >> Circle Detection using Hough Transform

by cl » Fri, 20 Jan 2006 21:12:34 GMT


radius

have a look into:
< http://basic-eng.blogspot.com >

cl

MATLAB >> Circle Detection using Hough Transform

by Dave Robinson » Fri, 20 Jan 2006 21:19:05 GMT


radius

There are several possibilities.

1) Extend the accumulator plane to three dimensions, and allow each
active pixel to vote for the position of the centre, and radius.
Usually this is hard work, however might be tractable since you have
a limited range of radius you want to contemplate.

2) Look up V.F. Leavers book "Shape Detection in Computer Vision
using the Hough Transform" published by Springer Verlag. He shows
that it is possible to identify cirles by applying the Hough
transform to the Hough transform of the original image, in other
words apply the Hough to the Hough. Never tried it, so I cannot say
how effective it is, although his examples look relatively
convincing.

3) Use the Generalized Hough Transform, This is not yet available in
the Image Processing pack. But is relatively easy to implement, and
is well described if you Google 'Generalized Hough Transform'.

4) Again I haven't tried them but there are several pretty high star
rating Matlab Hough based circle finding implementations in the File
Exchange - so you don't have to go too far to get them.

Regards

Dave Robinson

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