[Insight-users] MultiResolutionPyramidImageFilter possible problem

[Nithiananthan, Sajendra]

Hello everyone,

I noticed something a little weird in the MultiResolutionPyramidImageFilter.
The output when using a shrink factor of 1 is not the same as the input; the
output will be a smoothed version of the input. The effect is small, but
does exist. I do not think this is the correct behaviour. For a shrink
factor of 1, the output should be the exact same as the input. This can be
fixed easily  by checking for the special case of all shrink factors being 1
(perhaps not the most elegant solution). See attached patch.
As it is now, if you perform multi-resolution registration with one level
and default schedule the result is slightly different from if you had used
the normal registration filter. I think you should expect the results to be
exactly the same.

Let me know if I am misinterpreting what the behaviour should be in this
case.

-Sajendra


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