[Insight-users] To register binary images

[Carola Schmidt]

Hi,
thanks for an answer. I don't have to use the BSplineTransformation to 
register those images. Is there a transformation in ITK with which it is 
possible to register binary images?

Greetings,
Carola


Karthik Krishnan wrote:
> This is not surprising. What optimizer are you using ? Does it require 
> the computation of derivatives ?
>
> With a binary volume, you would have large homogeneous regions and 
> consequently several bspline nodes would end up getting derivative 
> values of 0 during optimization.
>
> You could try to transform the intensities of the images prior to 
> registration, possibly register their danielsson distance maps, or 
> smooth the images prior to registratation etc, so as to get nonzero 
> derivatives to help the optimizer guide the registration
>
> HTH
> --
> karthik
>
>
> On Wed, Jan 14, 2009 at 11:15 AM, Carola Schmidt 
> <carola.schmidt at igd.fraunhofer.de 
> <mailto:carola.schmidt at igd.fraunhofer.de>> wrote:
>
>     Hi,
>
>     I just tried to register two binary images with the
>     BSplineRegistration but it does not seem to work. The registration
>     method I use works on general volumes but when I change the input
>     to a binary volume it does not transform the image.
>     Which registration method could I use to register two binary
>     images which I have created with the the itk::thresholdfilter?
>     Thanks.
>
>     Greetings,
>     Carola
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>
>
>
> -- 
> Karthik Krishnan
> R&D Engineer,
> Kitware Inc.
> Ph: 518 371 3971 x119
> Fax: 518 371 3971