[Insight-users] GetCenter() ?

[tony hakki]

Dear Luis;
one more question ,if you reply I will really happy. I try to implement pointsettoimage registration. So How can I get  the origin,size,spacing etc. of my pointset. It is ok for moving image,but what about the pointset? when I write const OriginType pointsetOrigin = PointSet->GetSpacing(); it says 
Get spacing not member of  itk Pointset ( point set is defined like that typedef itk::PointSet< float, Dimension > FixedPointSetType;)

----- Original Message ----
From: Luis Ibanez <luis.ibanez at kitware.com>
To: tony hakki <tony2007vtk at yahoo.com>
Cc: insight-users at itk.org
Sent: Tuesday, March 27, 2007 3:33:50 PM
Subject: Re: [Insight-users] GetCenter() ?


Hi Tony,

Please read the ITK Software Guide:

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

There is a full section discussing the issue
of Center of Rotation for Transforms in the
context of image registration.

This is section: 8.6 "Centered Transforms".
pdf-page 380.

To put it short:  The center of rotation is
needed because in most image registration
problems it is desirable to rotate around
the center of the image extent and not
around the center of the coordinate system
origin.

You will find a related discussion in section 6.9.4
"Resample Image Filter" in pdf-pages 254-285.


    Regards,


       Luis


----------------------
tony hakki wrote:
> Hello;
> 
> I have tried to implement point set to image registration
> 
> What is the exact meaning of GetCenter(); in QuaternionRigidTransform
> 
> ? When we write like that  
> finalTransform->SetCenter(finalTransform->GetCenter() ); What does its mean?
> 
> thank you
> 
> Tony
> 
> 
> 
> ------------------------------------------------------------------------
> 
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> Insight-users at itk.org
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