[Insight-users] Re: FEM based deform registration : Using Landmarks

[Luis Ibanez]

Hi Tina,

There was a bug in the Read method of the
itkFEMLoadLandmark.

This was logged as Bug # 521.
http://www.itk.org/Bug/bug.php?op=show&bugid=521&pos=1

It has now been fixed in the CVS repository.

An example on how to use the landmark input file
has been commited on the Examples directory:


   Insight/Examples/Data

      FiniteElementRegistrationParameters2.txt
      FiniteElementRegistrationLandmarks.txt


The format for the Landmarks file is


<LoadLandmark>
   % Comment landmark A
   2 3.0 5.0     2 7.5 7.6     0.1
<LoadLandmark>
   % Comment landmark B
   2 23.0 35.0   2 27.5 37.6   0.1
<LoadLandmark>
   % Comment landmark C
   2 27.0 45.0   2 29.5 52.6   0.1
<END>


The line for each landmark is composed of two
vectors. They indicate the position of a point
before deformation and after deformation.

The vectors have the number of components as
the first number ( the number 2 in this case).

So:

    2   3.0  5.0

means a 2D vector with components (3.0,5.0)

The last number in the line is the square
root of the variance associated with this
landmark.


Please let us know if you have further
questions.


Thanks



     Luis



----------------------
Tina Wang wrote:

> Luis,
>  
> I want to use a mask file to only work on certain areas of my image data 
> during the registration process and have tried to read this mask file 
> as "landmarkfile" in the configuration file (1 % UseLandmarks? - read 
> the file name below if this is true
> mask.hdr % LandmarkFileName). But it did not work. Could you please tell 
> me how can I achieve this purpose?
>  
> Thanks,
>  
> Tina 
>