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jblitzar
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github-python-corpus

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g1 = plip_g(g1)
g2 = plip_g(g2)
return k * ((g1 - g2) / (k - g2))
def plip_cross(g1, g2, gamma):
g1 = plip_g(g1)
g2 = plip_g(g2)
return g1 + g2 - ((g1 * g2) / (gamma))
def plip_diag(c, g, gamma):
g = plip_g(g)
return gamma - (gamma * math.pow((1 - (g / gamma)), c))
def plip_multiplication(g1, g2):
return plip_phiInverse(plip_phi(g1) * plip_phi(g2))
# return plip_phiInverse(plip_phi(plip_g(g1)) * plip_phi(plip_g(g2)))
def plip_phiInverse(g):
plip_lambda = 1026.0
plip_beta = 1.0
return plip_lambda * (1 - math.pow(math.exp(-g / plip_lambda), 1 / plip_beta));
def plip_phi(g):
plip_lambda = 1026.0
plip_beta = 1.0
return -plip_lambda * math.pow(math.log(1 - g / plip_lambda), plip_beta)
def _uiconm(x, window_size):
"""
Underwater image contrast measure
ERROR: type should be string, got " https://github.com/tkrahn108/UIQM/blob/master/src/uiconm.cpp\n"
ERROR: type should be string, got " https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5609219\n"
"""
plip_lambda = 1026.0
plip_gamma = 1026.0
plip_beta = 1.0
plip_mu = 1026.0
plip_k = 1026.0
# if 4 blocks, then 2x2...etc.
k1 = x.shape[1] // window_size
k2 = x.shape[0] // window_size
# weight
w = -1. / (k1 * k2)
blocksize_x = window_size
blocksize_y = window_size
# make sure image is divisible by window_size - doesn't matter if we cut out some pixels
x = x[:blocksize_y * k2, :blocksize_x * k1]
# entropy scale - higher helps with randomness
alpha = 1
val = 0
for l in range(k1):
for k in range(k2):
block = x[k * window_size:window_size * (k + 1), l * window_size:window_size * (l + 1), :]
max_ = np.max(block)
min_ = np.min(block)
top = max_ - min_
bot = max_ + min_
if math.isnan(top) or math.isnan(bot) or bot == 0.0 or top == 0.0:
val += 0.0
else:
val += alpha * math.pow((top / bot), alpha) * math.log(top / bot)
# try: val += plip_multiplication((top/bot),math.log(top/bot))
return w * val
def getUIQM(x):
"""
Function to return UIQM to be called from other programs
x: image
"""
x = x.astype(np.float32)
### from https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7300447
# c1 = 0.4680; c2 = 0.2745; c3 = 0.2576
### from https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7300447
c1 = 0.0282
c2 = 0.2953
c3 = 3.5753
uicm = _uicm(x)
uism = _uism(x)
uiconm = _uiconm(x, 8)
uiqm = (c1 * uicm) + (c2 * uism) + (c3 * uiconm)
return uiqm