preprocess#7

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HassanAmr wants to merge 4 commits intopscholl:masterfrom

HassanAmr:preprocess

Commits on Jan 24, 2017

replaced preprocess.cpp by a python equivelant that includes a High- and Low-Pass filter
HassanAmr
committed

Commits on Jan 25, 2017

added some validations and exceptions handling before using the filter
HassanAmr
committed

Commits on Jan 30, 2017