[Insight-users] To register binary images

[Luis Ibanez]

Hi Carola,

What matters in this case is what Metric you use,
not what Transform you use.

You may want to look at the MatchCardinality Metric.


   Regards,


       Luis


------------------------
Carola Schmidt wrote:
> 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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>>     Insight-users at itk.org <mailto:Insight-users at itk.org>
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>>
>>
>>
>>
>> -- 
>> Karthik Krishnan
>> R&D Engineer,
>> Kitware Inc.
>> Ph: 518 371 3971 x119
>> Fax: 518 371 3971
> 
> 
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