[ITK] [ITK-users] Pointset registration

Dženan Zukić dzenanz at gmail.com
Wed Nov 11 17:26:52 EST 2015 

You could also try going straight to a numeric library, using singular
value decomposition
<http://eigen.tuxfamily.org/dox/classEigen_1_1JacobiSVD.html> to find your
3x4 transformation matrix. PointsVector*Matrix=AnotherPointsVector. It
could hardly get any simpler for a numeric library.

HTH

On Wed, Nov 11, 2015 at 5:23 PM, Matt McCormick <matt.mccormick at kitware.com>
wrote:

> Hi Matias,
>
> The examples for each class are linked in the class doxygen page [1].
> There is a Wiki example for the LandmarkBasedTransformInitializer [2].
>
> HTH,
> Matt
>
> [1]
> http://www.itk.org/Insight/Doxygen/html/classitk_1_1LandmarkBasedTransformInitializer.html
>
> [2]
> http://www.itk.org/Insight/Doxygen/html/WikiExamples_2Registration_2LandmarkBasedTransformInitializer_8cxx-example.html#_a3
>
> On Wed, Nov 11, 2015 at 5:15 PM, Matias Montroull <matimontg at gmail.com>
> wrote:
> > Thanks, it is indeed the case you describe.. Is there an ITK example I
> can
> > use as reference to implement the landmarkbasedtransform?
> > Matias.
> >
> > El mié., 11 de nov. de 2015 a la(s) 7:09 p. m., Andras Lasso
> > <lasso at queensu.ca> escribió:
> >>
> >> It seems that you want to do a simple landmark registration (you touch
> >> exactly the same points with the stylus, in the same order, as you
> defined
> >> in the image). If this is the case, then you should not use ICP but
> >> itk::LandmarkBasedTransformInitializer (with optional preprocessing
> step to
> >> determine the scale), as it is done in this Slicer module:
> >>
> >>
> >>
> https://github.com/Slicer/Slicer/blob/master/Modules/CLI/FiducialRegistration/FiducialRegistration.cxx
> >>
> >>
> >>
> >> Andras
> >>
> >>
> >>
> >>
> >>
> >> From: Community [mailto:community-bounces at itk.org] On Behalf Of Matias
> >> Montroull
> >> Sent: Wednesday, November 11, 2015 4:58 PM
> >> To: Matt McCormick <matt.mccormick at kitware.com>
> >> Cc: insight-users at itk.org Users <insight-users at itk.org>
> >> Subject: Re: [ITK] [ITK-users] Pointset registration
> >>
> >>
> >>
> >> Yes, here it goes..
> >>
> >>
> >>
> >> you will notice there are points that I had to repeat, the original
> >> dataset was 4 points on each file and I was getting warnings:  Number of
> >> unknowns(12) greater than number of data (4)
> >>
> >>
> >>
> >> "puntosfijos.txt" is the fixed pointsets
> >>
> >> "puntosflotantes.txt" is the moving pointset..
> >>
> >>
> >>
> >> Thanks for your help.
> >>
> >>
> >>
> >> Matias.
> >>
> >>
> >>
> >> El mié., 11 de nov. de 2015 a la(s) 6:43 p. m., Matt McCormick
> >> <matt.mccormick at kitware.com> escribió:
> >>
> >> Hi Matias,
> >>
> >> Can the datasets be shared?
> >>
> >> Thanks,
> >> Matt
> >>
> >> On Wed, Nov 11, 2015 at 4:38 PM, Matias Montroull <matimontg at gmail.com>
> >> wrote:
> >> > Thanks.
> >> >
> >> > Here's another question, it seems I need 12 points to perform the
> >> > registration and obtain the matrix, now, the results I'm getting are
> not
> >> > very good. We have the algorithm programmed manually (not using ITK)
> and
> >> > when we compare the results are different (way too different).
> >> > I just pulled the example and modified to 3 dimensions and changed the
> >> > translationtransform to an affine transform. Is there an example using
> >> > Affine that I can check? I'm thinking is not just changing the
> >> > transform,
> >> > there may be other variables I need to tweak..
> >> > Matias.
> >> >
> >> > El mié., 11 de nov. de 2015 a la(s) 5:51 p. m., Dženan Zukić
> >> > <dzenanz at gmail.com> escribió:
> >> >>
> >> >> Nowhere, which means it's the >> operator's standard white-space
> >> >> separators (spaces, tabs, newlines).
> >> >>
> >> >> On Wed, Nov 11, 2015 at 3:03 PM, Matias Montroull <
> matimontg at gmail.com>
> >> >> wrote:
> >> >>>
> >> >>> by the way, where in the code is the space separator specified?
> >> >>>
> >> >>> El mié., 11 de nov. de 2015 a la(s) 5:02 p. m., Matias Montroull
> >> >>> <matimontg at gmail.com> escribió:
> >> >>>>
> >> >>>> that worked! Thanks for the advise, I was under the impression that
> >> >>>> points needed to be separated by ";"
> >> >>>> Thanks again
> >> >>>>
> >> >>>> El mié., 11 de nov. de 2015 a la(s) 5:00 p. m., Dženan Zukić
> >> >>>> <dzenanz at gmail.com> escribió:
> >> >>>>>
> >> >>>>> By looking at the code, the numbers should be separated by space,
> >> >>>>> not
> >> >>>>> semicolon. Can you try that?
> >> >>>>>
> >> >>>>> HTH
> >> >>>>>
> >> >>>>> On Wed, Nov 11, 2015 at 2:51 PM, Matias Montroull
> >> >>>>> <matimontg at gmail.com>
> >> >>>>> wrote:
> >> >>>>>>
> >> >>>>>> Hi Dženan, thanks for the suggestion, I tried that example and I
> >> >>>>>> think
> >> >>>>>> I'm missign something as my disk drive became crazy.
> >> >>>>>> I basically created 2 txt files with a set of 4 points each in
> this
> >> >>>>>> format:
> >> >>>>>> -0.585938;92.406328;38.200
> >> >>>>>> 44.7654;52.73442;61.000
> >> >>>>>> -53.5;49.218792;68.200
> >> >>>>>> -1.757814;81.445382;70.600
> >> >>>>>>
> >> >>>>>> second file has the same format but different numbers of course.
> >> >>>>>>
> >> >>>>>> Is there anything wrong with how I entered the point sets in both
> >> >>>>>> files?
> >> >>>>>>
> >> >>>>>> As you can see it is 3 points per line separated by this
> character
> >> >>>>>> ";"
> >> >>>>>>
> >> >>>>>> Thanks,
> >> >>>>>>
> >> >>>>>> Matias.
> >> >>>>>>
> >> >>>>>>
> >> >>>>>> El mar., 10 de nov. de 2015 a la(s) 6:16 p. m., Dženan Zukić
> >> >>>>>> <dzenanz at gmail.com> escribió:
> >> >>>>>>>
> >> >>>>>>> Have you seen these two examples:
> >> >>>>>>>
> >> >>>>>>>
> >> >>>>>>>
> http://www.itk.org/Doxygen/html/Examples_2RegistrationITKv3_2IterativeClosestPoint3_8cxx-example.html
> >> >>>>>>>
> >> >>>>>>>
> >> >>>>>>>
> http://www.itk.org/Doxygen/html/Examples_2RegistrationITKv4_2IterativeClosestPoint3_8cxx-example.html
> >> >>>>>>>
> >> >>>>>>> HTH
> >> >>>>>>>
> >> >>>>>>> On Tue, Nov 10, 2015 at 3:18 PM, Matias Montroull
> >> >>>>>>> <matimontg at gmail.com> wrote:
> >> >>>>>>>>
> >> >>>>>>>> Hi,
> >> >>>>>>>>
> >> >>>>>>>> I have 2 sets of points (one is points on an image and another
> >> >>>>>>>> one
> >> >>>>>>>> is points on a NDI tracker) and I need to obtain the
> >> >>>>>>>> transformation matrix.
> >> >>>>>>>> What would be the best method? I'm currently using a Solver but
> >> >>>>>>>> I'd like to
> >> >>>>>>>> implement this using ITK and better if it is SimpleITK.
> >> >>>>>>>>
> >> >>>>>>>> Thank you!
> >> >>>>>>>>
> >> >>>>>>>> Matias.
> >> >>>>>>>> --
> >> >>>>>>>> Matias
> >> >>>>>>>>
> >> >>>>>>>> _____________________________________
> >> >>>>>>>> Powered by www.kitware.com
> >> >>>>>>>>
> >> >>>>>>>> Visit other Kitware open-source projects at
> >> >>>>>>>> http://www.kitware.com/opensource/opensource.html
> >> >>>>>>>>
> >> >>>>>>>> Kitware offers ITK Training Courses, for more information
> visit:
> >> >>>>>>>> http://www.kitware.com/products/protraining.php
> >> >>>>>>>>
> >> >>>>>>>> Please keep messages on-topic and check the ITK FAQ at:
> >> >>>>>>>> http://www.itk.org/Wiki/ITK_FAQ
> >> >>>>>>>>
> >> >>>>>>>> Follow this link to subscribe/unsubscribe:
> >> >>>>>>>> http://public.kitware.com/mailman/listinfo/insight-users
> >> >>>>>>>>
> >> >>>>>>>
> >> >>>>>> --
> >> >>>>>> Matias
> >> >>>>>
> >> >>>>>
> >> >>>> --
> >> >>>> Matias
> >> >>>
> >> >>> --
> >> >>> Matias
> >> >>
> >> >>
> >> > --
> >> > Matias
> >> >
> >> > _____________________________________
> >> > Powered by www.kitware.com
> >> >
> >> > Visit other Kitware open-source projects at
> >> > http://www.kitware.com/opensource/opensource.html
> >> >
> >> > Kitware offers ITK Training Courses, for more information visit:
> >> > http://www.kitware.com/products/protraining.php
> >> >
> >> > Please keep messages on-topic and check the ITK FAQ at:
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> >> >
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> >> >
> >>
> >> --
> >>
> >> Matias
> >
> > --
> > Matias
> _____________________________________
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