Use Resample over WarpImageFilter in Examples

[blowekamp]

These two filers apply deformation fields to images ( and vector images ). The same functionality now exist in the ResampleImageFilter.

[blowekamp]

@thewtex @ntustison @hjmjohnson
Any thought on these classes?

[hjmjohnson]

@blowekamp I am in favor of deprecating as long a documentation clearly expresses how to get the same results with ResampleImageFilter (Including an example refactoring).

Thanks Brad.

[blowekamp]

Here is list of examples which use the WarpImageFilter:

Filtering/WarpImageFilter1.cxx
RegistrationITKv3/DeformableRegistration10.cxx
RegistrationITKv3/DeformableRegistration16.cxx
RegistrationITKv3/DeformableRegistration17.cxx
RegistrationITKv3/DeformableRegistration2.cxx
RegistrationITKv3/DeformableRegistration3.cxx
RegistrationITKv3/DeformableRegistration5.cxx
RegistrationITKv3/DeformableRegistration9.cxx
RegistrationITKv3/LandmarkWarping2.cxx
RegistrationITKv4/DeformableRegistration10.cxx
RegistrationITKv4/DeformableRegistration16.cxx
RegistrationITKv4/DeformableRegistration17.cxx
RegistrationITKv4/DeformableRegistration2.cxx
RegistrationITKv4/DeformableRegistration3.cxx
RegistrationITKv4/DeformableRegistration5.cxx
RegistrationITKv4/DeformableRegistration9.cxx
RegistrationITKv4/LandmarkWarping2.cxx

Looks like step one is to update those examples to use the ResampleImageFilter.

[blowekamp]

We need to figure out what to do with the ITKv3 Registration examples...

[hjmjohnson]

The ITKv3 examples should definitely be deprecated, and I would recommend removing them (as they are now confusing to users who accidentally end up in that directory.

[hjmjohnson]

On second thought, perhaps we should just move them out of the "examples" directory and into a "testing" subdirectory as they may still have code coverage utility.

ITKv6 should evaluate if the ITKv3 framework is completely removed.

[blowekamp]

I agree that it is important to keep them as testing while we have the ITKv3 registration framework still there.

Tangentially related, ITKv4 registration framework now sounds old. Perhaps is would have been better to call the old one "legacy" registration framework, and just call the current one "the registration framework". I'm not sure how often it's called ITKv4 registration framework.

[blowekamp]

It would take quite a bit of effort to fully remove the warp filters now. There are a number of filters still using them.

The examples are the important things to update now to just use the ResampleImageFilter. I'll try to knock these off little by little.

[hjmjohnson]

It would take quite a bit of effort to fully remove the warp filters now. There are a number of filters still using them.

The examples are the important things to update now to just use the ResampleImageFilter. I'll try to knock these off little by little.

@blowekamp Thanks. I appreciate the efforts.