<div dir="ltr"><div><img src="https://mail.google.com/mail/u/0/images/cleardot.gif" alt="">David,<br><br></div>Have you tried Hough transforms? <br><br><a href="http://www.itk.org/Doxygen/html/classitk_1_1HoughTransform2DCirclesImageFilter.html" target="_blank">http://www.itk.org/Doxygen/html/classitk_1_1HoughTransform2DCirclesImageFilter.html</a><div class="gmail_extra">


<br>-- <br>Casey B. Goodlett, Ph.D.<br>R&D Engineer<br>Kitware, Inc. - North Carolina Office<br><a href="http://www.kitware.com" target="_blank">http://www.kitware.com</a><br>
</div></div>