### 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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