[Insight-users] DeformableRegistration5: Circle.png -> CircleSpikes.png

[Luis Ibanez]

Hi Aaron,


        The arrows are pointing the right way.


The arrows are intended to indicate the direction in which
you should move when you are mapping a pixel from the Fixed
image into a pixel in the Moving image.

Since you are using the CircleSpike.png as the fixed image
and Circles.png as moving image, the arrows (vectors of the
deformation field) point towards the center because that
the direction in which you should move the spikes in order
to match the circle.

You will find useful to read the ITK Software Guide,

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

in particular the "Image Registration" chapter, and specially
Section 8.3.1. "Direction of the Transform Mapping", in pdf-page
359. This section describes in detail what is the direction of
transformations in the ITK image registration framework, and
presents the rationale for choosing such direction.


    Regards,


       Luis



==================
Aaron Hagan wrote:
> Hi,
>  
> Viewing the defromation view from DeformableRegistration5 ( with the 
> moving image being: Circle.png and the fixed image being: 
> CircleSpikes.png). It looks like the arrows from the deformation field 
> are going the wrong way (The arrows are pointing towards the center of 
> the image) ?  Is this the right way the deformation field should look ?  
> Or should they be pointing away from the center?
>  
> (attached is a sample of the def Field from DeformableRegistration5 with 
> moving image being: Circle.png and the fixed image being: CircleSpikes.png)
>  
> Thanks for the help,
>  
> Aaron
>  
>  
> 
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