Hi Yashodhan, you can have a look either at http://www.insight-journal.org/browse/publication/101/ or http://www.insight-journal.org/browse/publication/111 for an itk based procrustes filter. The other option is to stick with vtkProcrustesAlignmentFilter which is contained in the current vtk release.
Let me knwo if this solves your alignment issues. Stefan On Fri, Dec 10, 2010 at 4:22 PM, Yashodhan Nevatia <[email protected]> wrote: > Dear Jochen, > > Do you possibly know of an alternative ITK or VTK filter/class that can be > used to do 3D point based registration which solves for rotation, translation > and scaling? > > Best regards, > > Yashodhan > > ----- Original Message ----- > From: "Neuhaus Jochen" <[email protected]> > To: "Keshav Chintamani" <[email protected]>, > "[email protected]" > <[email protected]> > Sent: Friday, December 10, 2010 3:39:47 PM > Subject: Re: [mitk-users] Landmark Registration: scaling, shearing, rotation > and translation in the MITK IGT > > Dear Keshav, > > > > mitk::NavigationDataLandmarkTransformFilter uses an > itk::QuaternionRigidTransform internally. Therefore, it can only handle > translation and rotation, no scaling or other operations. You would have > to transform your image or tracking data beforehand to use the same > scale. We have no other landmarktransform filter. You would have to > develop your own filter for that. If you are able to calculate a fitting > transform, you can use mitk::NavigationDataTransformFilter to apply it > to your NavigationData objects. > > > > Best Regards, > > Jochen > > > > > > > > > We were hoping you could provide help with some questions. > > 1) Does the NavigationDataLandmarkTransformFilter handle scaling? For > example, if the source data is in meters and the target data is in > millimeters. Or if the source data is scaled by some factor. > > Only when we matched the source and target data measurement units > (Source/Target = 1) did we get a perfect transform. But when the source > data was in a different unit, the output was offset in an arbitrary > direction. I have attached some pictures: > > In the pictures, the red ball should align with the circled purple ball. > This happens only when the source and target images are in the same > units/spacing > > 2) Is there a different filter we can use to get a landmark transform > between a generic 3D human image landmarks and landmarks on the target > body? This landmark transform will have to include scaling, shearing, > rotation and translation. > > Any help with these questions is greatly appreciated. Looking forward to > hearing your comments. > > > > Best Regards, > > -Keshav > > Keshav Chintamani, > Systems Engineer > Space Applications Services NV > Leuvensesteenweg 325 > 1932 Zaventem > Belgium > Tel: +32 2 721 54 84 Fax: +32 2 721 54 44 > URL: http://www.spaceapplications.com > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ mitk-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mitk-users > > -- > Yashodhan Nevatia > Systems Engineer > > Space Applications Services > Leuvensesteenweg 325 > B-1932 Zaventem > Belgium > Tel: +32 (0)2-721.54.84 > Fax: +32 (0)2-721.54.44 > URL: www.spaceapplications.com > > ------------------------------------------------------------------------------ > _______________________________________________ > mitk-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mitk-users > -- -- Stefan Daenzer Körnerplatz 8 04107 Leipzig Tel.: +49-157-84993879 "Work like you don't need the money, love like you've never been hurt and dance like no one is watching." - Randall G Leighton ------------------------------------------------------------------------------ _______________________________________________ mitk-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mitk-users
