[Insight-users] Deformable Registration Output ?

[Luis Ibanez]

Hi Hari,

Your problem is probably on the visualization side.

What software are you using for visualizing the
output image of the FEM deformable registration  ?

This file with extension .hdr is in Analyze format.

You can use any of the following applications for
visualizaing the data:


-  VolView
    The free version can be downloaded from
    http://www.kitware.com/products/volview.html

-  ImageViewer
    In InsightApplications/ImageViewer
    (it requires FLTK)

----

The reason why the PNG image looks black after you
convert it with the ImageReadWrite example, is that
ImageReadWrite by default uses 16bits/pixel (the
pixel type is "unsigned short"). Most simple viewers
do not normalize the intensity of images before
display, so the actual content of the image, which
is about 0-255 looks very dark in the full dynamic
range of 0-65535 [16 bits].  You can modify the
program ImageReadWrite in order to use "unsigned
char" or use a better viewer, such as the application
"ImageViewer" above.


---

Please run the following test and let us know
how it works for you:

Take the following two images (4 files)

      Insight/Examples/Data/RatLung1.mha
      Insight/Examples/Data/RatLung1.raw
      Insight/Examples/Data/RatLung2.mha
      Insight/Examples/Data/RatLung2.raw

copy them to your working directory and
execute the Demons example by typing the
following command:


    DeformableRegistration1.exe
             RatLung1.mha RatLung2.mha RatRegistered.png

    (all in a single line).

The output .png file should be visible even
with cheap viewers.



   Regards,


      Luis


--------------------------------------------
Hari Sundar wrote:

> Hi,
> 
> I was trying out the two deformable registration examples (itk-1.4). I am
> not able to see anything in the output. I get the warped image from the
> FEM based registration as a .hdr and a raw file. I am not able to read the
> header. I tried using ImageReadWrite to convert it into a png file, but
> the image is blank.
> 
> Similarly in the demons registration, if I give the output as a png file,
> i can't see anything.
> 
> What am I doing wrong here ?
> 
> thanks,
> -Hari
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