Re: Generalized hough transform help

[Stefan van der Walt]

On Thu, Mar 16, 2006 at 01:22:59PM +0100, Michael Mazur wrote:
> I'm trying to find some general guidance (or direction towards existing Octave
> code) on writing a circle detection routine using the hough transform. I
> understand that there is linear hough transform code for Octave but I have yet
> to get it to work properly. Thanks,

Here is an example of how to use the straight-line Hough-transform:

 I = zeros(100, 150);
 I(30,:) = 1; I(:, 65) = 1; I(35:45, 35:50) = 1;
 for i = 1:90, I(i,i) = 1;endfor
 I = imnoise(I, 'salt & pepper');
 imshow(I);
 J = houghtf(I); J = J / max(J(:));
 imshow(J*1024, hot(255), 'truesize');

Regards
Stéfan



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