def apply_gauss(img, filter_mask):
"""Apply a gaussian filter to an image.
Args:
img The image
filter_mask The filter mask (2D numpy array)
Returns:
Modified image
"""
return signal.correlate(img, filter_mask, mode="same") / np.sum(filter_mask)
# from http://stackoverflow.com/questions/17190649/how-to-obtain-a-gaussian-filter-in-python
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