[Insight-users] Plotting BSpline controlpoints/deformation vectors?

[Luis Ibanez]

Hi Motes,

Something that comes to mind is that you could mark the closest
pixels to your control points in the image that you are saving.

E.g. if you are using a CT image, you could use values around
2000 to highlight the closest pixel to every control point.

A second option is that you could create an itkMesh with these
points, save it as a vtkPolyData in a .vtk legacy file by  using the
itkVTKPolyDataWriter, and load it into Paraview, along with your
2D image, then use the Glyph filter on the loaded vtkPolyData.

You may also find useful this paper from the Insight Journal:

"Gridding Graphic Graticules"
by Tustison N., Avants B., Gee J.
http://www.insight-journal.org/browse/publication/140
http://hdl.handle.net/1926/475


     Regards,


          Luis


--------------------------------------------------------------
On Wed, Aug 12, 2009 at 8:02 AM, motes motes <mort.motes at gmail.com> wrote:

>
> On Tue, Aug 11, 2009 at 1:41 PM, motes motes <mort.motes at gmail.com> wrote:
>
>> I am using one of the basic BSplineDeformableTransform examples on some 2D
>> CT images of a brain.
>>
>> Now for each 5 or 10 iteration I would like to view the currently
>> registered image and the corresponding BSpline controlpoints (deformation
>> vectors).
>>
>> Are there any functionality in ITK that deals with this kind of
>> visualization of registered images in progress and the corresponding
>> controlpoints (deformation vectors)?
>>
>
>
>
>
>
>
>
> Ok I have now written some code that writes the registered image to disk
> after a sequence of N iterations.
>
> In the future I hope to  enable movement of control points in my
> application. Therefore I would also like to plot the current position of the
> control points on the current registered image.
>
> I am working on the following idea. When I store the current registered
> image, I write the position of the control points to a file.
>
> Later I can (hopefully) in eg. gnuplot load the image and read in the
> corresponding control points and plot them on top of the image.
>
> If anyone know of a better/easier way (maybe ITK already has examples
> showing this?) they are most welcome to give suggestions!
>
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