[Insight-users] To register binary images

[Karthik Krishnan]

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> 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
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