[Insight-users] Testing Robustness of Registration

[IsabelleNg]

Thank you Karthik for your reply.

I just realize that I omitted some info. I am using an centered-initializer
to initialize the transform (rigid 3d). In this case, would the following be
a valid sequence?

rigidTransform->SetIdentity();
resampler->SetTransform( randomXform );
initializer->SetMovingImage( resample->Getoutput() );
initializer->SetTransform( rigidTransform );

registration->SetInitialTransformParameters( rigidTransform->GetParameters()
)

Thanks again,
Isabelle





Karthik Krishnan-2 wrote:
> 
> On 5/4/07, IsabelleNg <isabelleNg at homeworking.org> wrote:
>>
>>
>> ITK-users,
>>
>> I wish to test one of the registration algorithm by applying random
>> transformations to the moving image. This is often done in papers that
>> report registration results as tests of robustness and capture range. Is
>> it
>> valid to perform these tests by simply initializing the transform with
>> random numbers? i..e by calling
>>
>> registration->SetInitialTransformationParameters( randomXform)?
> 
> 
> Hi Isabelle
> 
> Yes. It is identical.
> 
> Or, do we actually need to physically write out the randomly misaligned
>> images and then feed back into the algorithm?
>>
>> How would results differ with these 2 approaches?
> 
> 
> There wouldn't be a difference. There would be a marginal difference
> depending on the transform used to resample the moving image before
> writing
> to the disk. In the first case, the initial transform is the same as the
> one
> used for registration.
> 
> 
> -- 
> Karthik Krishnan
> R&D Engineer,
> Kitware Inc.
> 
> _______________________________________________
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> Insight-users at itk.org
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> 
> 

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