Hello, everyone.
I am using itkRegistrationMethodV4 to perform a multistage registration: 1st stage is a 3D rigid transform, and the 2nd stage is a BsplineTransform.
The problem I am stucking happens when I try to connect the 1st stage obtained transform into the next stage, the Bspline one:
One way is using compositeTransform:
compositeTransform->AddTransform(deformableInitialTransform);
compositeTransform->SetOnlyMostRecentTransformToOptimizeOn();
and
registrationV4Object->SetInitialTransform(compositeTransform);
Although, this looks ok it did not work. For the second stage, It outputs (iteration, metricValue) as follows:
1152921504606846977 7.09521e-317 1152921504606846977 7.09521e-317 1152921504606846977 7.09521e-317 1152921504606846977 7.09521e-317 1152921504606846977 7.09521e-317
Which sound non-sense.
The ItkExamples I found (deformableRegistration15.cpp) uses ItkRegistrationMethod not ItkRegistrationMethodV4. That changes how to set the transforms into registrationV4Object.
Any clues are appreciated.