[Insight-users] Transformation of an image after registration

[Abayiz]

Hello,

I've performed registration using "VersorRigid3DTransform", and now want to perform transformation on original moving image with these registration result parameters. For doing that, I tried taking the inverse of the registration then give it to the affine transform type. Here is my partial code:

**************************************
typedef itk::AffineTransform< double, 3 > AffineType;

AffineType::Pointer affine = AffineType::New();

//finalTransform->SetParameters( finalParameters );

affine->SetMatrix( transform->GetRotationMatrix() );
affine->SetOffset( transform->GetOffset() );

AffineType::Pointer invTransform = affine->GetInverseTransform();

AffineType::MatrixType invmatrix = invTransform->GetMatrix();
AffineType::OffsetType invoffset = invTransform->GetOffset();


  ResampleFilterType::Pointer invresampler = ResampleFilterType::New();

  invresampler->SetTransform( invTransform );
  invresampler->SetInput( movingImageReader->GetOutput() );

  FixedImageType::Pointer invImage = movingImageReader->GetOutput();

  invresampler->SetSize(    movingImageReader->GetLargestPossibleRegion().GetSize() );
  invresampler->SetOutputOrigin(  movingImageReader->GetOrigin() );
  invresampler->SetOutputSpacing( movingImageReader->GetSpacing() );
  invresampler->SetOutputDirection( movingImageReader->GetDirection() );
  invresampler->SetDefaultPixelValue( 100 );

*********************************************
Then I got this error: 

error: conversion from ‘itk::SmartPointer<itk::TransformBase>’ to non-scalar type ‘itk::SmartPointer<itk::AffineTransform<double, 3u> >’ requested


Why the datatype is wrong here? Does affine transform only accept non-scalar type? Besides, is my method correct for what I want to do? 


Thank you very much in advance !
Regards,
Abayiz
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