NiftyNet Interpolation order

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In NiftyNet framework - what is the purpose of interp_order param in config file? There is very short explanation in documentation which is not clear enough.

Why there is usually set to 0 in label section, and to 3 in image section.

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zach_er On BEST ANSWER

0 means 'nearest neighbour': you only want labels to have integer values. 3 means cubic interpolation, which is good for images that are close to continuous-valued.