fix cv2.resize dsize order

[jiangwei221]

In the last merge, the cv2.resize is not used properly. The order of the dsize should be (width, height). demo:

>>> import cv2
>>> import numpy as np
>>> img = np.ones([128, 128, 3])
>>> new_img = cv2.resize(img, (128, 256))
>>> new_img.shape
(256, 128, 3)

[jiangwei221]

Didn't fully verify the whole method, just a quick fix the that bug.

[bearpaw]

Thanks for the fix. Close because it is included in #117