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<p class=MsoNormal><span lang=EN-US>Dear All,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>It is mentioned in the ItkSoftwareGuide (version2.4.0
8.7 Multi-ResolutionReigstration) that “another possible scheme is
to use a simple translation transform for the initial coarse registration and
an affine transform at the finer levels”.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>It means that in different levels, we will
use different transformers:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Level 0: <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>typedef itk::TranslationTransform<
double, Dimension > TransformType;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>TransformType::Pointer
transform = TransformType::New();<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Level higher:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>typedef itk::AffineTransform< double, 2
> TransformType1;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>TransformType1::Pointer
transform1 = TransformType1::New();<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>So I revised the MultiResImageRegistraion1.xx
and the code is like this:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>template <typename TRegistration><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>class RegistrationInterfaceCommand : public
itk::Command <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>{<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> if (
registration->GetCurrentLevel() == 0 )<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:31.5pt'><span lang=EN-US>//…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> else<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> {<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
registration->SetTransform(
transform1 );<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>//…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>class CommandIterationUpdate : public
itk::Command <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>{<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>//…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Int main()<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>{//…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
registration->SetOptimizer(
optimizer );<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
registration->SetTransform(
transform );<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>//…<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:5.25pt'><span lang=EN-US>registration->StartRegistration();<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I got the error message that “Description:
itk::ERROR: RegularStepGradientDescentOptimizer(022E64D0):<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> of Scales is 6, but the
NumberOfParameters for the CostFunction is 2.”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Obviously, parameters used to initialize
optimizer are different at different levels. I don’t know how to solve
this problem. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>And I wonder how does the translation
transform give its result to the next level’s affine transform.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>If you have done this kind of registration
before, please tell me how to solve the problem.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks a lot!<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>yurenji<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
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