[Insight-users] Minimum size of image in image registration?

[Luis Ibanez]

Hi Motes,

Before we go into further promoting superstitions,
let me clarify:


                The BSplineDeformableTransform
                     *CAN* be used with images
                        smaller than 512x512.


If in your registration of 256x256 image you are obtaining
a salt-and-pepper image, the most likely cause is that this
second set of images are using a different pixel type or
an incorrect endiannes.


It is very unlikely that the problem has anything to do with
the image size.



Please do the following:

1) Just after reading the images into your program:
     save them again in another format and visualize them
     with your favorite image viewer (hopefully not the
     Windows fax-viewer).

2) If the images look ok, then post to the list the description
    of your registration test:

     * Transform
     * Optimizer
     * Interpolator
     * Initializer



  Thanks


       Luis




-----------------------------------------------------------------------------
On Wed, Sep 9, 2009 at 4:48 PM, motes motes <mort.motes at gmail.com> wrote:
> I am playing around with the BSplineDeformableTransform example.
>
> I run it for 300 iterations on a 2D image of Lena. When I run it with
> 512*512 versions I get a reasonable result, metric value = 218.566.
>
> I also have a 256*256 version of the images. If I use those instead
> (still 300 iterations) I get a very poor result (actually the
> registered image is just a salt and peber image) metric value =
> 1.56493e+007.
>
> It seems that using the BSplineDeformableTransform only makes sense on
> images with at least 512*512 pixels or am I missing some other
> parameters that can be tuned for smaller images?
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