Incorrect number of pyramid levels

[mantiuk]

From issue #33:

You define the min_freq at 0.2 but you create 2 more levels that are below this spatial frequency in lpyr

The offending constructor:

ColorVideoVDP/pycvvdp/lpyr_dec.py

Line 18 in a46b414

def __init__(self, W, H, ppd, device):

The logic for finding the right number of pyramid levels does not seem right. The peak band frequencies are (for a 1920x1080 image):

array([37.70122467, 12.16995532,  6.08497766,  3.04248883,  1.52124442,
        0.76062221,  0.3803111 ,  0.19015555,  0.09507778])

The entire class may require refactoring, as it is based on the old Matlab class.