update: use open cv for faster computation
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Very nice if this speedups this function. Would it be an idea to use the skimage default behaviour for the case sigma is not provided but
anti_aliasing = True
and set sigma as:By default, this value is chosen as (s - 1) / 2 where s is the downsampling factor, where s > 1. For the up-size case, s < 1, no anti-aliasing is performed prior to rescaling.
In this way, one does not need to calculate the right sigma all the time
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