[Insight-users] Model to Image Registration

[Luis Ibanez]

Hi Neilson,

If you register a could of N points to an image, the
result of registration will be a single transform
for all the points, not a trasform per point.

Note that the family of transforms available in ITK is
quite complete, so you could choose from very simple
transforms such as pure translation upto very complex
ones such as the ones described with Kernel Splines
and Bsplines.

You will find interesting to read the tutorial on
registration available in the tutorial session:

    http://www.itk.org/HTML/Tutorials.htm

in particular

http://www.itk.org/CourseWare/Training/RegistrationMethodsOverview.pdf

You will also benfit from reading the chapter on
image registration in the SoftwareGuide

      http://www.itk.org/ItkSoftwareGuide.pdf

Chapter 8, pdf-page 241.


Regards,


     Luis




  --------------------------------
N.E. Mackenzie Mackay wrote:
> Thanks Luis,
> 
>     I have read through the examples and have a question.  If I have N  
> points is the final result of the registration N different transforms  
> or one for all the points? ( are the points transformed indipendantly  
> or together? )
> 
>     I could use one or the other but I would prefer just one 
> transform.   My points describe a 2d surface of a bone and I want to 
> match that to a  ct image of the same bone.  I would like the transform 
> to transform the  points as a whole.  Just translating and rotating the 
> points to the  correct position in the image.
> 
> Neilson
> 
> On Jul 6, 2004, at 8:18 PM, Luis Ibanez wrote:
> 
>>
>> Hi Neilson,
>>
>>
>> Yes,
>>
>> ITK has PointSetToImage registration methods.
>>
>> Please look at the classes:
>>
>> http://www.itk.org/Insight/Doxygen/html/ 
>> classitk_1_1NormalizedCorrelationPointSetToImageMetric.html
>> http://www.itk.org/Insight/Doxygen/html/ 
>> classitk_1_1MeanSquaresPointSetToImageMetric.html
>>
>> and the framework
>>
>> http://www.itk.org/Insight/Doxygen/html/ 
>> classitk_1_1PointSetToImageRegistrationMethod.html
>>
>> The rest of registration components are shared with
>> the ImageToImage registration framework, that is,
>> the optimizers, interpolators and transforms.
>>
>>
>> SpatialObject could also be used for this purpose if what
>> you have is a synthetic geometrical model of the anatomical
>> structure.  However, if you already have a PointSet, then
>> the classes above are the more direct path.
>>
>> You will find useful to look at the tests:
>>
>> Insight/Testing/Code/Algoritms/
>>       itkMeanSquaresPointSetToImageMetricTest.cxx
>>       itkNormalizedCorrelationPointSetToImageMetricTest.cxx
>>       itkPointSetToImageRegistrationTest_1.cxx
>>
>>
>>
>>   Please let us know if you have further questions,
>>
>>
>>
>>     Thanks
>>
>>
>>       Luis
>>
>>
>> ------------------------------
>> N.E. Mackenzie Mackay wrote:
>>
>>> I wish to rigidly register a set of points that defines the contour  
>>> of a bone to an image of that bone in 2 dimensions.  Can itk be used  
>>> to do such a registration?
>>> I was wondering if ITK had a snake algorithm or a point to image  
>>> filter or any other algorithm that might be used to achieve my task.
>>> I have looked at section 8.14 in the user guide "model Based  
>>> Registration" but am left a little confused how to create a spatial  
>>> object from a set of points.
>>> Neilson
>>> _______________________________________________
>>> Insight-users mailing list
>>> Insight-users at itk.org
>>> http://www.itk.org/mailman/listinfo/insight-users
>>
>>
>>
>>
> 
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