<br>Hi Albert,<br><br>There is currently no specific filter for detecting hyperbolas.<br><br>However, at first sight, it seems to be a solvable problem.<br><br>The key to it, is to find a good parameterization of the<br>hyperbola. <br>
<br>Once you find one, you could reuse most of the code in<br>the existing Hough filter classes in ITK.<br><br><br>Are you hyperbolas expected to be in any position, <br>orientation and scale ?<br><br>One tempting option is to look at the reciprocation of<br>
a circle on another circle:<br><br><a href="http://en.wikipedia.org/wiki/Hyperbola#Reciprocation_of_a_circle">http://en.wikipedia.org/wiki/Hyperbola#Reciprocation_of_a_circle</a><br><br>which renders a hyperbola.<br><br>It may be possible to use this mapping in order to<br>
reuse the Circle Hough Transform for Hyperbolas.<br><br><br>Should you find a way to implement such filter,<br>it will be great if you share it with others in the<br>Insight Journal. :-)<br><br><br> <a href="http://insight-journal.org">http://insight-journal.org</a><br>
<br><br> Regards,<br>
<br><br> Luis<br><br><br>-----------------------------------------------------------------------------------------------------<br><div class="gmail_quote">On Wed, Oct 27, 2010 at 9:03 AM, Albert King <span dir="ltr"><<a href="mailto:albert.king84@yahoo.com" target="_blank">albert.king84@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi List,<br>
<br>
I am a new user to itk.I am working on arbitrary shape detection algorithm.I am<br>
interest to know whether there is any in built function to detect hyperbolas in<br>
a image using hough transform in itk .The hough transform algorithm should<br>
detect hyperbolic structure in a image and should display only hyperbolic<br>
structure's.Can any please tell me if there is any hyperbola detection mechanism<br>
using hough transform in itk or vtk.Awaiting your positive response .Thanks<br>
<br>
<br>
<br>
With Best Regards<br>
<br>
Albert<br>
<br>
<br>
<br>
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