def gabor_kernel(W, angle, freq):
cos = math.cos(angle)
sin = math.sin(angle)
yangle = lambda x, y: x * cos + y * sin
xangle = lambda x, y: -x * sin + y * cos
xsigma = ysigma = 4
return utils.kernel_from_function(
W, lambda x, y: math.exp(-(
(xangle(x, y)**2) / (xsigma**2) + (yangle(x, y)**2) /
(ysigma**2)) / 2) * math.cos(2 * math.pi * freq * xangle(x, y)))
def gabor_kernel(W, angle, freq):
cos = math.cos(angle)
sin = math.sin(angle)
yangle = lambda x, y: x * cos + y * sin
xangle = lambda x, y: -x * sin + y * cos
xsigma = ysigma = 4
return utils.kernel_from_function(W, lambda x, y:
math.exp(-(
(xangle(x, y) ** 2) / (xsigma ** 2) +
(yangle(x, y) ** 2) / (ysigma ** 2)) / 2) *
math.cos(2 * math.pi * freq * xangle(x, y)))