[Insight-users] LineSpatialObject: problem with applying a transformation

[Luis Ibanez]

Hi Igor,

Thanks for your clarification.

If you have the coordinates of the original points,
what you could do is to load these points into an
itkPointSet.

Then, you can use the itkMeshTransformFilter in oder
to apply the transformation to all the points.

Please look at the DataRepresentation chapter of the
ITK Software Guide for a description on how to set
the points of a PointSet.


    Regards,


       Luis


----------------
Hoveijn, I wrote:
> Hi Luis,
> 
> Thanks very much for your reply. Maybe I did not make myself clear.
> 
> The problem is not visualization of a transformed line. Given the
> transformation I wish to transform a contour, which is given as an
> ordered set of points. In my application I need the coordinates of the
> points of the transformed contour. I tried to collect the points in a
> LineSpatialObject and then apply the transformation to this object. That
> resulted in an error at compile time.
> 
> I would be happy to feed the points separately to the transformation,
> but the nearest I could find in the ItkSoftwareGuide is the
> LineSpatialObject.
> 
> I will include my code as well as the error message.
> 
> Yours,
> 
> Igor
> 
> 
> 
> 
> -----Oorspronkelijk bericht-----
> Van: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
> Verzonden: vrijdag 23 maart 2007 19:46
> Aan: Hoveijn, I
> CC: insight-users at itk.org
> Onderwerp: Re: [Insight-users] LineSpatialObject: problem with applying
> a transformation
> 
> 
> Hi Igor,
> 
> 
> If your line is only 1-pixel wide, it can easily get lost in the
> interpolation and the transformation of point locations through the
> BSPlineDeformableTransform.
> 
> You may want to use a very thick line, or a pattern that fills in the
> entire image.
> 
> For examples on how to visualize the effect of deformable registration,
> please look at the ITK Software Guide.
> 
>      http://www.itk.org/ItkSoftwareGuide.pdf
> 
> 
> in particular to section 8.15 "Visualizing Deformation Fields" in
> pdf-pages 501-508.
> 
> 
>     Regards,
> 
> 
> 
>        Luis
> 
> 
> 
> -------------------
> Hoveijn, I wrote:
> 
>>Dear ITK-users,
>>
>>I am using BSplineDeformableTransform to find a transformation form 
>>one image to another. Then I would like to use the transformation to 
>>map a line in the first image to a line in the second image. By 
>>analogy I cut and pasted the code below. Everything works fine except 
>>transforming the line. Please let me know if more details are needed. 
>>I would be grateful if someone could help me.
>>
>>Remark. The header of the procedure may look strange. This code is 
>>compiled and linked into a dll file and then called form Matlab.
>>
>>Igor Hoveijn
>>
>>
>