David,<br><br>Just a quick look, so you probably need to do some analysis on your own for it. Looking at the data sets, it appears that you are sampling Bunny.vtp and using it to sample points from BunnyScan.vtp using ICP. Since BunnyScan only contains the front side of Bunny, any points sampled from the rear surface of Bunny will not find a true match and will end up pulling the registration toward the center of Bunny instead of the fine alignment of the surface you are looking to get. This is consistent with the data you are showing.<br>
<br>You might be able to get what you are looking for simply by swapping the source and target in the ICP, grabbing the Matrix4x4 from the ICP on completion. If you want to move Bunny to BunnyScan you will then need to also grab the Matrix4x4 from icp, inverting it, and applying it as the transform to Bunny for the alignment. I believe that directly inverting the icp just swaps source and target which will get you right back to your current state. <br>
<br>All of this is from memory, so your mileage may vary. <br><br>- Wes<br><br><div class="gmail_quote">On Sat, Mar 21, 2009 at 11:48 AM, David Doria <span dir="ltr"><<a href="mailto:daviddoria@gmail.com">daviddoria@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Here are my input files / output file:<br><br><a href="http://www.rpi.edu/%7Edoriad/Bunny/" target="_blank">http://www.rpi.edu/~doriad/Bunny/</a><br>
<br>I am trying to register Bunny.vtp to BunnyScan.vtp and the result is in MatchedBunny.vtp<br>
<br>Here are my settings:<br> vtkIterativeClosestPointTransform * icp = vtkIterativeClosestPointTransform::New();<br> icp->SetMaximumNumberOfIterations(1000);<br> icp->SetMaximumMeanDistance(1e-6);<br> icp->GetLandmarkTransform()->SetModeToRigidBody();<br>
<br>I believe I am calling everything correctly because the resulting point cloud is much nearer than the original. However it seems to still be significantly wrong. Anyone know why this would be?<br><br clear="all">Thanks,<br>
<font color="#888888">
<br>David<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Wesley D. Turner, Ph.D.<br>Kitware, Inc.<br>R&D Engineer<br>28 Corporate Drive<br>Clifton Park, NY 12065-8662<br>Phone: 518-371-3971 x120<br>