How to use the gradient.get_phase function in gradient
To help you get started, we’ve selected a few gradient examples, based on popular ways it is used in public projects.
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ctmakro / opencv_playground / painterfun.py View on Github 
def samplepoints():
# sample a lot of points from one error image - save computation cost
point_list = []
y,x,d = wherediff()
phasemap = gradient.get_phase(flower)
# while not enough points:
while len(point_list)0.5*rn():
# get gradient orientation info from phase map
phase = phasemap[ry,rx] # phase should be between [0,2pi)
# choose direction perpendicular to gradient
angle = (phase/math.pi*180+90)%360
# angle = 22.5
