Dear Luke,<br>sorry I don't have an answer for your question, hope that you solved it or someone will help ...<br>But I have a question related ...<br>I try to use itkFiniteDifferenceImageFilter to iterate with <br>f_{n+1} = f_n +dt*A_n <br>
and I dont know how to introduce the A_n in this filter, I guess is done with ? <br>FiniteDifferenceImageFilter<..>::GenerateData()<br>{<br>...<br>this->ApplyUpdate()<br>...<br>}<br> <br>is there an itk simple example of an implemntation of the ApplyUpdate() and how to use it to iterate with this filter.<br>
<br>Thanks, <br>Elhadj, <br><br>
<div class="gmail_quote">On Fri, Apr 30, 2010 at 5:45 PM, Luke Bloy <span dir="ltr"><<a href="mailto:luke.bloy@gmail.com">luke.bloy@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">I'm curious about the stopping criteria used in the demons based registrations.<br><br>From looking at itkFiniteDifferenceImageFilter::Halt() it seems that the stopping criteria are one of either 2 things.<br>
1) the number of iterations exceeds some maximum.<br> 2) the RMS_change is less then some MaximumRMSError.<br><br>In the demons algorithm the RMS_change is defined as the average of the length of the update displacement field. Which seems to never decrease significantly.<br>
<br>Am I correct that there is no stopping criteria based on the image similarity metric? If not what would be the most sensible way/place to add such a criteria? Is there any interest in having this functionality?<br><br>
thanks,<br>Luke<br><br><br><br>_____________________________________<br>Powered by <a href="http://www.kitware.com/" target="_blank">www.kitware.com</a><br><br>Visit other Kitware open-source projects at<br><a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br>
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