[Insight-users] Re : BSpline implementation?

[Syrine Sahmim]

Hi, 
I'm a new user of ITK. ihave many difficulties and i need help.
I have dicom image and MIP image.i want to read them on itk and then
execute one of the segmentation methods and display the segmentation
results. My questions are: 1.how to read a dicom image or MIP 2.if i
have to display the segmentation result doi need vtk? when i read the
examples and had to try them i have diffculties to undersatnd some
things like ( region, instantiate region,..) Please can you help to go
faster in my application specially i'm a new user on image processing
and itk environement. 
Thanks in advance, 

syrine




________________________________
De : Nicholas Tustison <ntustison at gmail.com>
À : motes motes <mort.motes at gmail.com>
Cc : Insight Users <insight-users at itk.org>
Envoyé le : Lundi, 15 Juin 2009, 13h24mn 15s
Objet : Re: [Insight-users] BSpline implementation?


Based on my experience, I would guess that most filters/functions/etc. in ITK use uniform B-splines.  As such the core class would be itkBSplineKernelFunction which evaluates uniform B-spline values for orders 0-4.  I wrote the itkCoxDeBoorBSplineKernelFunction to house other functionality and to generalize uniform B-spline evaluation to n orders (although, for straightforward evaluation of orders 0-4, it is faster to use the itkBSplineKernelFunction class).    

I haven't used the class itkNonUniformBSpline but, according to the doxygen documentation, it is still under development, so you could perhaps improve functionality there.

Nick

On Jun 15, 2009, at 3:40 AM, motes motes wrote:

I have an assignment where I need to evaluate the ITK BSpline implementation and see if I can improve the performance based on my own implementation (based on the algorithms from The NURBS Book). In this implementation only the k basisfunctions different from 0 are determined where k is the order of the BSpline. Further the knot-differences from lower order basisfunctions are reused.

I therefore need to find the source files in ITK that implements these methods or alternative approaches if they are visible for the end user.



On Mon, Jun 15, 2009 at 12:35 AM, Nick Tustison <ntustison at wustl.edu> wrote:

Hi motes, 
 
As you note there are a few classes related to B-splines.  Perhaps you can tell us what you're trying to accomplish and someone can point you in the right direction.
 
Nick Tustison


On Sun, Jun 14, 2009 at 5:35 PM, motes motes <mort.motes at gmail.com> wrote:

I am trying to find out how the BSplines used in the ITK are implemented. I have been looking at the files in the folder:

InsightToolkit-3.12.0\Code\Common

But it seems that its mainly functions/classes that uses BSplines. Where are the core BSpline implementation located and how is it implemented? I have been looking for details like:

B-spline Basis functions: Cox de boor recursion, de Casteljau, etc ?
Containers for knots, controlpoints, datapoints
etc..

Any help appreciated!

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