Width normalizer in cost volume fusion

[zhouxf53]

deep-video-mvs/dvmvs/utils.py

Line 62 in fa14288

width_normalizer = width / 2.0

I think it is supposed to be

width_normalizer = (width  - 1) / 2.0
height_normalizer = (height - 1) / 2.0

The reason of that is to map x from [0, width-1] to [-1, 1] to grid sampling instead of map [0, width] to [-1, 1]