[Insight-users] Multi-scale multi-resolution registration: non-integer schedules for image pyramids

[Ali -]

Hi,

The image pyramid used in multi-resolution registration, itk::MultiResolutionPyramidImageFilter, only accepts schedules of type of integer. For example, for a 2D image, we can have a 5-level schedule like:

[16, 16]
[ 8,   8]
[ 4,   4]
[ 2,   2]
[ 1,   1]

In multi-scale multi-resolution registrations, fractional schedules must be used, for example the same 5-level schedule should be in the form of:

[4/8, 4/8]
[5/8, 5/8]
[6/8, 6/8]
[7/8, 7/8]
[8/8, 8/8] = [1, 1]


- Is multi-scale multi-resolution registration already implemented in ITK?

- What is the best way of implementing the fractional schedules?

- Would Gaussian smoothing be an alternative for this? Is there any ITK applications/examples using a similar approach?

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