BUG: add a padding in preprocessing and a cropping in postprocessing. Fix #587
BUG: add a padding in preprocessing and a cropping in postprocessing. Fix #587

3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox