Unsharp: transition effect visible on multi-stage reconstruction

When using unsharp masking with multi-stage reconstruction (ex. LocalReconstruction), a transition is clearly visible between stages. It sensibly hampers the reconstruction quality.

In the current implementation, unsharp is performed on the "inner" part of data (i.e after cropping the phase retrieved data):

[margin_up | data | margin_down ]  --(phase retrieval)--> [ data ]  --(unsharp)--> [data]

Perhaps it would be better to

• do the filtering on all [margin | data | margin] instead of just [data]
• do the cropping after unsharp