def _group_values(self, prop, values):
    return [[value] for value in values]
void cvCanny( const CvArr* image, CvArr* edges, double threshold1, double threshold2, int aperture_size=3 );
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/datastore/datastore_query.py/CorrelationFilter._group_values--crossover with--dataset/ETHPy150Open bolme/pyvision/src/pyvision/edge/canny.py/canny