def _local_maxima(image, diameter, separation, percentile=64):
"Find local maxima whose brightness is above a given percentile."
# Find the threshold brightness, representing the given
# percentile among all NON-ZERO pixels in the image.
flat = np.ravel(image)
threshold = stats.scoreatpercentile(flat[flat > 0], percentile)
# The intersection of the image with its dilation gives local maxima.
assert image.dtype == np.uint8, "Perform dilation on exact (uint8) data."
dilation = morphology.grey_dilation(
image, footprint=circular_mask(diameter, separation))
maxima = np.where((image == dilation) & (image > threshold))
if not np.size(maxima) > 0:
raise ValueError, ("Bad image! Found zero maxima above the {}"
"-percentile treshold at {}.".format(
percentile, threshold))
# Flat peaks, for example, return multiple maxima.
# Eliminate redundancies within the separation distance.
maxima_map = np.zeros_like(image)
maxima_map[maxima] = image[maxima]
peak_map = filters.generic_filter(
maxima_map, _Cfilters.nullify_secondary_maxima(),
footprint=circular_mask(separation), mode='constant')
# Also, do not accept peaks near the edges.
margin = int(separation)/2
peak_map[..., :margin] = 0
peak_map[..., -margin:] = 0
peak_map[:margin, ...] = 0
peak_map[-margin:, ...] = 0
peaks = np.where(peak_map != 0)
if not np.size(peaks) > 0:
raise ValueError, "Bad image! All maxima were in the margins."
return peaks[1], peaks[0] # x, y
def calc_abundance(cdl, affine, window, meta):
"""
Calculate farm abundance based on nesting and floral coefficients for
various crop types.
"""
# Create floral and nesting rasters derived from the CDL
fl_out = np.zeros(shape=cdl.shape, dtype=np.float32)
n_out = np.zeros(shape=cdl.shape, dtype=np.float32)
floral = reclassify_from_data(cdl, SETTINGS['floral_reclass'], fl_out)
nesting = reclassify_from_data(cdl, SETTINGS['nesting_reclass'], n_out)
# Create an abundance index based on forage and nesting indexes
# over the area a bee may travel
forage = generic_filter(floral,
footprint=SETTINGS['window'],
function=focal_op)
source = forage * nesting
area_abundance = generic_filter(source,
footprint=SETTINGS['window'],
function=focal_op)
if DEBUG:
write_tif('cdl', cdl, affine, window, meta)
write_tif('floral', floral, affine, window, meta)
write_tif('nesting', nesting, affine, window, meta)
write_tif('forage', forage, affine, window, meta)
write_tif('source', source, affine, window, meta)
write_tif('abundance', area_abundance, affine, window, meta)
return area_abundance
def normalize(data, mask, method='mean', axis=[1, 4], window_size=2):
masked_data = np.where(np.invert(mask), data, np.nan)
result = np.zeros(shape=masked_data.shape)
norm_scene = np.zeros(shape=result.shape)
for time_bin in range(data.shape[0]):
for freq_bin in range(data.shape[3]):
scene = masked_data[time_bin, :, :, freq_bin]
if (method == 'mean'):
norm = generic_filter(scene, np.nanmean, size=window_size)
elif (method == 'median'):
norm = generic_filter(scene,
np.nanmedian,
size=window_size)
elif (method == 'min'):
norm = generic_filter(scene, np.nanmin, size=window_size)
else:
raise Exception(
"Method needs to be either mean, median or min")
result[time_bin, :, :, freq_bin] = scene - norm
norm_scene[time_bin, :, :, freq_bin] = norm
return np.array(result), np.array(norm_scene)
def coarseness(img, k):
# compute average over all 0,..,k-1 regions of side-length 2^k-1
A = __coarsness_average(img, k)
# compute differences between pairs of non-overlapping neighbourhoods
E = scipy.zeros([img.ndim] + list(A.shape), dtype=scipy.float_) # matrix holding computed differences in all directions
for dim in range(img.ndim):
for nbh in range(k):
shape = img.ndim * [1]
shape[dim] = 2 * int(math.pow(2, nbh)) + 1
footprint = scipy.zeros(shape, dtype=scipy.bool_)
idx = img.ndim * [0]
footprint[tuple(idx)] = 1
idx[dim] = -1
footprint[tuple(idx)] = 1
generic_filter(A[nbh], lambda x: abs(x[0]- x[1]), output=E[dim][nbh], footprint=footprint, mode='mirror')
# compute for each voxel the k value, that lead to the highest E (regardless in which direction)
S = scipy.zeros_like(img)
for x in range(S.shape[0]):
for y in range(S.shape[1]):
for z in range(S.shape[2]):
maxv = 0
maxk = 0
for dim in range(img.ndim):
for nbh in range(k):
if E[dim][nbh][x,y,z] > maxv:
maxv = E[dim][nbh][x,y,z]
maxk = nbh
S[x,y,z] = maxk
return S
def binSpec(self, nbins, median=True):
"""Write this function at some point
median or mean bin the spectrum
"""
def medianFootprint(values):
return np.median(values)
def meanFootprint(values):
return np.mean(values)
footprint = np.ones((nbins, ))
if median == True:
self.wave = spfilt.generic_filter(self.wave,
medianFootprint,
footprint=footprint,
mode='reflect',
cval=0.)
self.flux = spfilt.generic_filter(self.flux,
medianFootprint,
footprint=footprint,
mode='reflect',
cval=0.)
else:
self.wave = spfilt.generic_filter(self.wave,
meanFootprint,
footprint=footprint,
mode='reflect',
cval=0.)
self.flux = spfilt.generic_filter(self.flux,
meanFootprint,
footprint=footprint,
mode='reflect',
cval=0.)
def extrema(input, halfwidth=2, excludeedges=False):
"""Find local extrema
halfwidth:
Returns two lists (minima, maxima)
"""
from scipy.ndimage.filters import generic_filter
from scipy.ndimage import extrema
"""Return all local maxima/minima."""
minima = collections.defaultdict(int)
maxima = collections.defaultdict(int)
inputLength = len(input)-1
#i = [ 0 ]
def f(array, il):
i = il[0]
# This function returns (mini, maxi), the indexes of the max
# and min of the array. They return the *lowest* possible
# such indexes, thus the max(0, ...) below.
min_, max_, mini, maxi = extrema(array)
#print array, (min_, max_, mini, maxi), mini[0]+i-halfwidth, maxi[0]+i-halfwidth
minima[max(0, mini[0]+i-halfwidth)] += 1
maxima[ maxi[0]+i-halfwidth ] += 1
il[0] += 1
return 0
#from fitz import interactnow
generic_filter(input, f, size=2*halfwidth+1, mode='nearest',
extra_arguments=([0],) )
if excludeedges:
minima.pop(0, None) ; minima.pop(len(input)-1, None)
maxima.pop(0, None) ; maxima.pop(len(input)-1, None)
return list(sorted(k for k,v in minima.items() if v > (halfwidth))), \
list(sorted(k for k,v in maxima.items() if v > (halfwidth)))
def lee_filter(x, variance_threshold, window=5):
'''THE POWER OF ARRAY BROADCASTING COMPELS YOU'''
u = generic_filter(x, lambda q: q.mean(), size=window)
s2 = generic_filter(x, lambda q: q.var(), size=window)
K = 1. - variance_threshold / s2 # A little wasteful, but fine for now...
K[variance_threshold > s2] = 0.
return K * x + (1. - K) * u
def median_clip(array, sigma, num_neighbor=5):
"""Sigma clipping for detecting outlying values in 2d array. If the parameter
'neighbor' is True the clipping can be performed in a local patch around
each pixel, whose size depends on 'neighbor' parameter.
Parameters
----------
array : array_like
Input 2d array, image.
sigma : float
Value for sigma
num_neighbor : int
The side of the square window around each pixel where the sigma and
median are calculated.
Returns
-------
array where outliers have been replaced by the median values
Adapted from the VIP package sigma_filter method:
https://github.com/vortex-exoplanet/VIP
@carlgogo
Modified by J. Olofsson to use the footprint instead of the size in generic filter.
"""
assert type(num_neighbor) is int, "num_neighbor should be an int"
if not array.ndim == 2:
raise TypeError("Input array is not two dimensional (frame)\n")
if num_neighbor % 2 == 0:
raise ValueError("num_neighbor should be an odd integer\n")
# footprint will exlcude the central pixel
footprint = np.ones(shape=(num_neighbor, num_neighbor))
footprint[num_neighbor / 2, num_neighbor / 2] = 0.
values = array.copy()
median = generic_filter(array,
function=np.median,
size=(num_neighbor, num_neighbor),
mode="mirror")
stdev = generic_filter(array,
function=np.std,
size=(num_neighbor, num_neighbor),
mode="mirror")
# median = generic_filter(array, function=np.median, footprint = footprint, mode="mirror")
# stdev = generic_filter(array, function=np.std, footprint = footprint, mode="mirror")
good1 = values > (median - sigma * stdev)
good2 = values < (median + sigma * stdev)
bad1 = values < (median - sigma * stdev)
bad2 = values > (median + sigma * stdev)
bad = np.where(bad1 | bad2) # deviating px indices in either bad1 or bad2
values[bad] = median[
bad] # replace the bad pixels by the median in the box
del median
del stdev
return values
def two_step_esmod(params, nRow, nCol):
"""Two stage ES model where first an intermediary layer is calculated as the
same as the simple ES model but only if the land cover type is that required.
The ES value is then calculated as the mean of the intermediary layer within
the desired window.
Parameters
----------
params: pd.series
Values of each of the parameters (p, h, w - window size, r - replicate)
nRow: int
Number of rows in the landscape
nCol: int
Number of columns in the landscape
"""
p = params['p']
h = params['h']
w = int(params['w'])
r = params['r']
out = mpd_prop(nRow, nCol, h, p)
# define the ES function
# output the first layer (e.g. the one where focal patch must be = 1)
wdw1 = generic_filter(out, np.mean, w, mode='wrap')
# multiply wdw by out to set the zeros to zero
wdw1 = wdw1 * out
# this is currently set to take the relationship as 1:1 (i.e. 10% natural cover = 10% ecosystem service)
# will need to add in the relationship to create ES surface at a later date
es1_mean = np.mean(wdw1)
es1_total = np.sum(wdw1)
es1_var = np.var(
wdw1
) # NB this is population variance, try to work out if this is right, if sample variance needed use ddof = 1
# output the second layer (e.g. the one which takes in the first as input and works on the opposite land cover = 0)
wdw2 = generic_filter(wdw1, np.mean, w, mode='wrap')
wdw2 = wdw2 * (1 - out)
es2_mean = np.mean(wdw2)
es2_total = np.sum(wdw2)
es2_var = np.var(
wdw2
) # NB this is population variance, try to work out if this is right, if sample variance needed use ddof = 1
return pd.Series({
'p_val': p,
'h_val': h,
'rep': r,
'window_size': w,
'es1_mean': es1_mean,
'es1_total': es1_total,
'es1_var': es1_var,
'es2_mean': es2_mean,
'es2_total': es2_total,
'es2_var': es2_var
})
def clip_array(array, lower_sigma, upper_sigma, out_good=False, neighbor=False,
num_neighbor=None):
"""Sigma clipping for detecting outlying values in 2d array. If the parameter
'neighbor' is True the clipping can be performed in a local patch around
each pixel, whose size depends on 'neighbor' parameter.
Parameters
----------
array : array_like
Input 2d array, image.
lower_sigma : float
Value for sigma, lower boundary.
upper_sigma : float
Value for sigma, upper boundary.
out_good : {'False','True'}, optional
For choosing different outputs.
neighbor : {'False','True'}, optional
For clipping over the median of the contiguous pixels.
num_neighbor : int, optional
The side of the square window around each pixel where the sigma and
median are calculated.
Returns
-------
good : array_like
If out_good argument is true, returns the indices of not-outlying px.
bad : array_like
If out_good argument is false, returns a vector with the outlier px.
"""
if not array.ndim == 2:
raise TypeError("Input array is not two dimensional (frame)\n")
values = array.copy()
if neighbor and num_neighbor:
median = generic_filter(array, function=np.median,
size=(num_neighbor,num_neighbor), mode="mirror")
sigma = generic_filter(array, function=np.std,
size=(num_neighbor,num_neighbor), mode="mirror")
else:
median = np.median(values)
sigma = values.std()
good1 = values > (median - lower_sigma * sigma)
good2 = values < (median + upper_sigma * sigma)
bad1 = values < (median - lower_sigma * sigma)
bad2 = values > (median + upper_sigma * sigma)
if out_good:
good = np.where(good1 & good2) # normal px indices in both good1 and good2
return good
else:
bad = np.where(bad1 | bad2) # deviating px indices in either bad1 or bad2
return bad
def farmland_birds_sim(ls_size, h, w1, w2, npp):
"""Function to predict species richness of farmland bird indicator species using amount
and heterogeneity of habitat at the appropriate scale. Currently the proportions for each
landscape are fixed, only the spatial autocorrelation changes
Parameters
----------
ls_size: int
Side length of the landscape
h: float
spatial autocorrelation of the landscape
w1: int
size of the amount window
w2: int
size of the heterogeneity window
npp: float
level of npp for the landscape
Returns
-------
out: array
Predicted species richness of farmland bird indicator species
"""
# create landscape with four land cover types 1-3 are habitat, 0 is not
ls = mpd(ls_size, ls_size, h)
ls = classifyArray(ls, [0.25, 0.25, 0.25, 0.25])
binary = (ls != 0) * 1
# for each cell, calculate habitat amount within the window
ls_amount = generic_filter(
ls, lc_prop, w1, mode='wrap', extra_keywords={'lc': [1, 2, 3]
}) * binary
# for each cell, calculate the habitat heterogeneity within the window
ls_hetero = generic_filter(ls,
shannon,
w2,
mode='wrap',
extra_keywords={'lc': [1, 2, 3]})
# multiply the amount*hetero*npp
out = ls_amount * ls_hetero * npp
return pd.Series({
'ls_size': ls_size,
'h_val': h,
'w1': w1,
'w2': w2,
'npp': npp,
'es_mean': np.mean(out),
'es_var': np.var(out)
})
def temporal_interp(data_one_variable):
footprint = np.zeros((3, 1, 1))
footprint[[0, 2], 0, 0, ] = 1
return generic_filter(data_one_variable,
np.nanmean,
footprint=footprint,
mode='nearest')
def find_scaling_window(to_filter, size=None):
if size is None:
x = max(to_filter.shape[0] // 5, 2)
y = max(to_filter.shape[1] // 10, 1)
size = (x, y)
filtered = generic_filter(to_filter, np.median, size=size,
mode='constant', cval=to_filter.max() * 100)
min_spa, min_spe = np.unravel_index(filtered.argmin(), to_filter.shape)
spa1 = min_spa - size[0] // 2
if spa1 < 0:
spa1 = 0
spa2 = spa1 + size[0]
if spa2 > to_filter.shape[0]:
spa1 = to_filter.shape[0] - size[0]
spa2 = to_filter.shape[0]
spe1 = min_spe - size[1] // 2
if spe1 < 0:
spe1 = 0
spe2 = spe1 + size[1]
if spe2 > to_filter.shape[1]:
spe1 = to_filter.shape[1] - size[1]
spe2 = to_filter.shape[1]
spa_slice = slice(spa1, spa2)
spe_slice = slice(spe1, spe2)
return (spa_slice, spe_slice)
def spatial_mean(data_one_variable):
footprint = np.zeros((1, 3, 3))
footprint[0, :, :] = 1
footprint[0, 1, 1] = 0
return generic_filter(
data_one_variable, np.nanmean, footprint=footprint, mode='wrap'
) #TODO: we need wrap for longitude and nearest for latitude
def gapfill_interpolation(data, n=5):
"""
Impute (i.e. Gapfill) data by infilling the spatiotemporal mean for each variable independently. A cube of n 5-pixel side length surrounding each missing value is taken and the mean of all non-missing values in this cube is computed and used to infill the missing value . If a point cannot be filled because all the values in the neighbourhood are missing as well, the points is filled by the local monthly climatology. Any remaining missing points are filled by the local temporal mean, or, if not available, the global mean of the variable.
Parameters
----------
data: xarray dataarray, with coordinates time, latitude, longitude and variable
n: size of the cube in any spatiotemporal dimension
Returns
----------
imputed_data: data of the same shape as input data, where all values that were not missing are still the same and all values that were originally missing are imputed via spatiotemporal mean
"""
# infill spatiotemporal mean
footprint = np.ones((1, n, n, n))
tmp = generic_filter(data, mean_fct, footprint=footprint, mode='nearest')
data = data.fillna(tmp)
log_fracmis(data, 'after filtering')
# infill dayofyear mean
seasonality = dataxr_lost.groupby('time.dayofyear').mean(dim='time')
data = data.groupby('time.dayofyear').fillna(seasonality).drop('dayofyear')
log_fracmis(data, 'after seasonality')
# infill variable mean
temporal_mean = data.mean(dim=('time'))
variable_mean = data.mean(dim=('time', 'latitude', 'longitude'))
data = data.fillna(temporal_mean)
data = data.fillna(variable_mean)
log_fracmis(data, 'after mean impute')
return data
def compute(valid):
''' Get me files '''
prob = None
for hr in range(-15,0):
ts = valid + datetime.timedelta(hours=hr)
fn = ts.strftime("hrrr.ref.%Y%m%d%H00.grib2")
if not os.path.isfile(fn):
continue
grbs = pygrib.open(fn)
gs = grbs.select(level=1000,forecastTime=(-1 * hr * 60))
ref = generic_filter(gs[0]['values'], np.max, size=10)
if prob is None:
lats, lons = gs[0].latlons()
prob = np.zeros( np.shape(ref) )
prob = np.where(ref > 29, prob+1, prob)
prob = np.ma.array(prob / 15. * 100.)
prob.mask = np.ma.where(prob < 1, True, False)
m = MapPlot(sector='iowa',
title='HRRR Composite Forecast 4 PM 20 May 2014 30+ dbZ Reflectivity',
subtitle='frequency of previous 15 model runs all valid at %s, ~15km smoothed' % (valid.astimezone(pytz.timezone("America/Chicago")).strftime("%-d %b %Y %I:%M %p %Z"),))
m.pcolormesh(lons, lats, prob, np.arange(0,101,10), units='%',
clip_on=False)
m.map.drawcounties()
m.postprocess(filename='test.ps')
m.close()
def test_percentileFilter1d():
for mode in modes.keys():
size = np.random.randint(1000, 2000, [
1,
]).item()
cShape = NumCpp.Shape(1, size)
cArray = NumCpp.NdArray(cShape)
data = np.random.randint(100, 1000, [
size,
]).astype(np.double)
cArray.setArray(data)
kernalSize = 0
while kernalSize % 2 == 0:
kernalSize = np.random.randint(5, 15)
percentile = np.random.randint(0, 101, [
1,
]).item()
constantValue = np.random.randint(0, 5, [
1,
]).item() # only actaully needed for constant boundary condition
dataOutC = NumCpp.percentileFilter1d(
cArray, kernalSize, percentile, modes[mode],
constantValue).getNumpyArray().flatten()
dataOutPy = filters.generic_filter(data,
np.percentile,
footprint=np.ones([
kernalSize,
]),
mode=mode,
cval=constantValue,
extra_arguments=(percentile, ))
assert np.array_equal(np.round(dataOutC, 7), np.round(dataOutPy, 7))
def gamma(sample, reference, delta_d, delta_D, resolution):
''' Compute the gamma deviation distribution between a sample and reference distribution,
based on composite evaluation of Distance-To-Agreement (DTA) and Dose Deviation (DT).
:param sample: sample distribution (ndarray)
:param reference: reference distribution (ndarray)
:param delta_d: distance-to-agreement criterion, i.e. search window limit in
the same units as `resolution` (float)
:param delta_D: dose difference criterion, i.e. maximum passable deviation between
distributions (float)
:param resolution: resolution of each axis of the distributions (tuple, or scalar for 1D)
:return: evaluated gamma distribution (ndarray, same dimensions as input distributions)
'''
kernel = gammaKernel(delta_d, resolution)
assert sample.ndim == reference.ndim == kernel.ndim, \
'`sample` and `reference` dimensions must equal `kernel` dimensions'
assert sample.shape == reference.shape, \
'`sample` and `reference` arrays must have the same shape'
# Save kernel footprint and flatten kernel for passing into generic_filter
footprint = np.ones_like(kernel)
kernel = kernel.flatten()
# Compute squared dose deviations, normalized to dose difference criterion
normalized_dose_devs = (reference - sample)**2 / delta_D**2
# Move the DTA penalty kernel over the normalized dose deviation values and search
# for the minimum of the sum between the kernel and the values under it.
# This is the point of closest agreement.
gamma_dist = generic_filter(normalized_dose_devs,
lambda x: np.minimum.reduce(x + kernel),
footprint=footprint)
# return Euclidean distance
return np.sqrt(gamma_dist)
def test_uniformFilter1d():
for mode in modes.keys():
size = np.random.randint(1000, 2000, [
1,
]).item()
cShape = NumCpp.Shape(1, size)
cArray = NumCpp.NdArray(cShape)
data = np.random.randint(100, 1000, [
size,
]).astype(float)
cArray.setArray(data)
kernalSize = 0
while kernalSize % 2 == 0:
kernalSize = np.random.randint(5, 15)
constantValue = np.random.randint(0, 5, [
1,
]).item() # only actaully needed for constant boundary condition
dataOutC = NumCpp.uniformFilter1d(
cArray, kernalSize, modes[mode],
constantValue).getNumpyArray().flatten()
dataOutPy = filters.generic_filter(data,
np.mean,
footprint=np.ones([
kernalSize,
]),
mode=mode,
cval=constantValue)
assert np.array_equal(dataOutC, dataOutPy)
def _StatisticalNaturalness(self, L_ldr, win=11):
phat1 = 4.4
phat2 = 10.1
muhat = 115.94
sigmahat = 27.99
u = np.mean(L_ldr)
# moving window standard deviation using reflected image
if self.original:
W, H = L_ldr.shape
w_extra = (11 - W % 11)
h_extra = (11 - H % 11)
# zero padding to simulate matlab's behaviour
if w_extra > 0 or h_extra > 0:
test = np.pad(L_ldr,
pad_width=((0, w_extra), (0, h_extra)),
mode='constant')
else:
test = L_ldr
# block view with fixed block size, like in the original article
view = view_as_blocks(test, block_shape=(11, 11))
sig = np.mean(np.std(view, axis=(-1, -2)))
else:
# deviation: moving window with reflected borders
sig = np.mean(generic_filter(L_ldr, np.std, size=win))
beta_mode = (phat1 - 1.) / (phat1 + phat2 - 2.)
C_0 = beta.pdf(beta_mode, phat1, phat2)
C = beta.pdf(sig / 64.29, phat1, phat2)
pc = C / C_0
B = norm.pdf(u, muhat, sigmahat)
B_0 = norm.pdf(muhat, muhat, sigmahat)
pb = B / B_0
N = pb * pc
return N
def std_intensity(image, w):
std_image = filters.generic_filter(image,
function=stddev,
size=3,
mode='constant',
cval=0)
return std_image
def blob_detector_downsample(image):
threshold = 0.003
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
gray = gray.astype(np.float32) / 255.
h, w = gray.shape
scale_space = np.zeros((h, w, level))
for i in range(level):
scale = k**i
scale_gray = transform.resize(gray, (int(h / scale), int(w / scale)),
mode='reflect')
square_lg = gaussian_laplace(scale_gray, sigma=initial)**2
scale_space[:, :, i] = transform.resize(square_lg, (h, w),
mode='reflect')
nms_3d = generic_filter(scale_space, nms, size=(3, 3, 3))
# nms_3d = rank_nms(scale_space)
# nms_3d = nms_3d/np.max(nms_3d)
cx = []
cy = []
radius = []
for i in range(level):
sigma = initial * k**i
cx.append(list(np.where(nms_3d[:, :, i] > threshold)[1]))
cy.append(list(np.where(nms_3d[:, :, i] > threshold)[0]))
radius.append([np.sqrt(2) * sigma] * len(cx[i]))
cx = np.concatenate(cx)
cy = np.concatenate(cy)
radius = np.concatenate(radius)
return gray, cx, cy, radius
def blob_detector_increase(image):
threshold = 0.01
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
gray = gray.astype(np.float32) / 255.
h, w = gray.shape
scale_space = np.zeros((h, w, level))
# Laplacian Gaussian filter
for i in range(level):
sigma = initial * k**i
scale_normalize = sigma**2 * gaussian_laplace(gray, sigma=sigma)
scale_space[:, :, i] = scale_normalize**2
# generic filter
nms_3d = generic_filter(scale_space, nms, size=(3, 3, 3))
# nms_3d = rank_nms(scale_space)
# nms_3d = nms_3d/np.max(nms_3d)
cx = []
cy = []
radius = []
for i in range(level):
sigma = initial * k**i
cx.append(list(np.where(nms_3d[:, :, i] > threshold)[1]))
cy.append(list(np.where(nms_3d[:, :, i] > threshold)[0]))
radius.append([np.sqrt(2) * sigma] * len(cx[i]))
cx = np.concatenate(cx)
cy = np.concatenate(cy)
radius = np.concatenate(radius)
return gray, cx, cy, radius
def get_coldest_values(dataObj, matched):
nobj = NeighbourObj()
t11 = get_channel_data_from_objectfull_resolution(dataObj, '11', nodata=-9)
#t11 = np.random.rand(10,10)*10+270
row, col = np.indices(t11.shape)
from scipy.ndimage.filters import generic_filter
flat_index = generic_filter(t11,
function=np.argmin,
size=5,
mode='constant',
cval=9999999999999)
flat_index = np.array(flat_index, dtype=np.int)
delta_row, delta_col = np.unravel_index(flat_index, (5,5))
delta_row = delta_row - 2
delta_col = delta_col - 2
new_row = row+delta_row
new_col = col+delta_col
new_row_matched = np.array([new_row[matched['row'][idx], matched['col'][idx]]
for idx in range(matched['row'].shape[0])])
new_col_matched = np.array([new_col[matched['row'][idx], matched['col'][idx]]
for idx in range(matched['row'].shape[0])])
new_row_col = {'row': new_row_matched, 'col': new_col_matched}
nobj.coldest_t11=get_channel_data_from_object(dataObj, '11', new_row_col)
nobj.coldest_t12=get_channel_data_from_object(dataObj, '12', new_row_col)
nobj.coldest_t37=get_channel_data_from_object(dataObj, '37', new_row_col)
nobj.coldest_r06=get_channel_data_from_object(dataObj, '06', new_row_col)
nobj.coldest_r16=get_channel_data_from_object(dataObj, '16', new_row_col)
nobj.coldest_r09=get_channel_data_from_object(dataObj, '09', new_row_col)
return nobj
def _apply_smoother_at_all_points(input_matrix, weight_matrix):
"""Applies any kind of smoother at all grid points.
M = number of grid rows
N = number of grid columns
m = number of grid rows used for smoothing at each point
n = number of grid columns used for smoothing at each point
This method treats all NaN's as zero.
:param input_matrix: M-by-N numpy array of input data.
:param weight_matrix: m-by-n numpy array of weights.
:return: output_matrix: M-by-N numpy array of smoothed input values.
"""
weight_vector = numpy.reshape(weight_matrix, weight_matrix.size)
input_matrix[numpy.isnan(input_matrix)] = 0.
output_matrix = generic_filter(input_matrix,
function=_apply_smoother_at_one_point,
size=(weight_matrix.shape[0],
weight_matrix.shape[1]),
mode='constant',
cval=0.,
extra_arguments=(weight_vector, ))
output_matrix[numpy.absolute(output_matrix) < TOLERANCE] = numpy.nan
return output_matrix
def _local_maxima(image, diameter, separation, percentile=64):
"Find local maxima whose brightness is above a given percentile."
# Find the threshold brightness, representing the given
# percentile among all NON-ZERO pixels in the image.
flat = np.ravel(image)
threshold = stats.scoreatpercentile(flat[flat > 0], percentile)
# The intersection of the image with its dilation gives local maxima.
assert image.dtype == np.uint8, "Perform dilation on exact (uint8) data."
dilation = morphology.grey_dilation(image,
footprint=circular_mask(
diameter, separation))
maxima = np.where((image == dilation) & (image > threshold))
if not np.size(maxima) > 0:
raise ValueError, ("Bad image! Found zero maxima above the {}"
"-percentile treshold at {}.".format(
percentile, threshold))
# Flat peaks, for example, return multiple maxima.
# Eliminate redundancies within the separation distance.
maxima_map = np.zeros_like(image)
maxima_map[maxima] = image[maxima]
peak_map = filters.generic_filter(maxima_map,
_Cfilters.nullify_secondary_maxima(),
footprint=circular_mask(separation),
mode='constant')
# Also, do not accept peaks near the edges.
margin = int(separation) / 2
peak_map[..., :margin] = 0
peak_map[..., -margin:] = 0
peak_map[:margin, ...] = 0
peak_map[-margin:, ...] = 0
peaks = np.where(peak_map != 0)
if not np.size(peaks) > 0:
raise ValueError, "Bad image! All maxima were in the margins."
return peaks[1], peaks[0] # x, y
def find_peaks_indexes(arr, window_width=5, threshold=0.0):
"""Find indexes of peaks in a 1d array.
Note that window_width must be an odd number. The function imposes that the
fluxes in the window_width /2 points to the left (and right) of the peak
decrease monotonously as one moves away from the peak.
Parameters
----------
arr : 1d numpy array
Input 1D spectrum.
window_width : int
Width of the window where the peak must be found. This number must be
odd.
threshold : float
Minimum signal in the peak (optional).
Returns
-------
ipeaks : 1d numpy array (int)
Indices of the input array arr in which the peaks have been found.
"""
if (window_width<3) or (window_width % 2 == 0):
raise ValueError('Window width must be an odd number and >=3')
kernel_peak = kernel_peak_function(threshold)
out = generic_filter(arr, kernel_peak, window_width, mode="reflect")
result, = numpy.nonzero(out)
return filter_array_margins(arr, result, window_width)
def _piecewise_linreg(xyw, window_width=3):
n = int(np.round((window_width - 1) / 2))
piece_a = generic_filter(xyw.T, _calc_linreg_wrapper_a, size=(3, window_width), mode='nearest')
piece_b = generic_filter(xyw.T, _calc_linreg_wrapper_b, size=(3, window_width), mode='nearest')
# pad array
piece_a = np.pad(piece_a[1, :], n, 'edge')
piece_b = np.pad(piece_b[1, :], n, 'edge')
smooth_a = np.convolve(piece_a, np.ones(window_width) / window_width, mode='valid')
smooth_b = np.convolve(piece_b, np.ones(window_width) / window_width, mode='valid')
y_est = smooth_b * xyw[:, 0] + smooth_a
return y_est
def find_scaling_window(to_filter, size=None):
if size is None:
x = max(to_filter.shape[0] // 5, 2)
y = max(to_filter.shape[1] // 10, 1)
size = (x, y)
filtered = generic_filter(to_filter,
np.median,
size=size,
mode='constant',
cval=to_filter.max() * 100)
min_spa, min_spe = np.unravel_index(filtered.argmin(), to_filter.shape)
spa1 = min_spa - size[0] // 2
if spa1 < 0:
spa1 = 0
spa2 = spa1 + size[0]
if spa2 > to_filter.shape[0]:
spa1 = to_filter.shape[0] - size[0]
spa2 = to_filter.shape[0]
spe1 = min_spe - size[1] // 2
if spe1 < 0:
spe1 = 0
spe2 = spe1 + size[1]
if spe2 > to_filter.shape[1]:
spe1 = to_filter.shape[1] - size[1]
spe2 = to_filter.shape[1]
spa_slice = slice(spa1, spa2)
spe_slice = slice(spe1, spe2)
return (spa_slice, spe_slice)
def smooth(self):
# return the percentage of smooth areas"
gray = cv2.cvtColor(self.opened_file_cv2, cv2.COLOR_BGR2GRAY)
filtered_image = generic_filter(gray, np.std, size=3)
smooth_area = filtered_image == 0
percent = np.count_nonzero(smooth_area) / smooth_area.size
return round(percent, 2)
def _remove_dup_laplace(self, data, mask, size=5):
laplacian = np.multiply(laplace(data, mode='wrap'), mask)
return generic_filter(laplacian,
self._local_max_laplace,
size=size,
mode='wrap',
extra_keywords={'size': size})
def square_filter(X, f):
"""Scans a square-shaped filter over the input matrix X, applies
the reducer function f and returns a new matrix with the same
dimensions of X containing the reduced values.
"""
footprint = np.array([[1, 1, 1], [1, 1, 1], [1, 1, 1]])
proc = generic_filter(X, f, footprint=footprint, mode='wrap')
return proc
def _vecS2(k, data):
'''min filter for peak detection.'''
def func(x):
return x[k] - 0.5 * (x[:k].mean() + x[k+1:].mean())
ap = generic_filter(data, func, size=2*k+1)
return ap
def wroll(npfunc, grid, winsize=(20, 20)):
# grid = iterabs[0]
# npfunc = iterabs[1]
P, Q = grid.shape
N, M = winsize
wroll_ = generic_filter(grid, function=npfunc, size=(M, N))
wroll = wroll_[M // 2:(M // 2) + P - M + 1, N // 2:(N // 2) + Q - N + 1]
return wroll
def varFilt(self, im, sz):
# Mask
NHOOD = ones([sz, sz])
r = floor((sz - 1) / 2)
NHOOD[r + 1, r + 1] = 0
# Filter
imvar = generic_filter(im, std, footprint=NHOOD)
return imvar
def two_step_binary_cont(ls_size,
p,
h1,
h2,
w1,
w2,
w3,
fp1_same=True,
fp2_same=True):
# note w1 is for the first stage, w2 is the scale at which the output of first
# stage is important, w3 is for the continuous ls
# at the moment this function doesn't allow for differing functions on the links
ls_binary = mpd_prop(ls_size, ls_size, h1, p)
ls_cont = mpd(ls_size, ls_size, h2)
w1_out = generic_filter(ls_binary, np.mean, w1, mode='wrap')
if (fp1_same == True):
w1_out = w1_out * ls_binary
w2_out = generic_filter(w1_out, np.mean, w2, mode='wrap')
if (fp2_same == True):
w2_out = w2_out * (1 - ls_binary)
w3_out = generic_filter(ls_cont, np.var, w3,
mode='wrap') # this is the context dependency
out = w2_out * (
1 - w3_out
) # in this instance, the more variable the continuous surface within the window, the less the effect of the pollinators
return pd.Series({
'ls_size': ls_size,
'p_val': p,
'h_val1': h1,
'h_val2': h2,
'w1': w1,
'fp1_same': fp1_same,
'w2': w2,
'fp2_same': fp2_same,
'w3': w3,
'es_mean': np.mean(out),
'es_var': np.var(out)
})
def steiner_filter(self):
"""
Steiner Filter is based on the Steiner Method Steiner et al. (1995) for
filtering convective rainfall from a radar image.
This method follow 3 rules, which should be applied to every point the
grid:
1. Intensity: Any point above 40dBZ is a Convective Point
2. Peak: Any point above a threshold (a) over the mean local rain
(11 km radius circle) is a Convective Point
3. Neighbor: Every point around a certain radius (b) around a Convective
point is also a Convective Point
(a) is the threshold
(b) is given by the static method convective_radius, in this class
"""
data = np.copy(self.data)
# On a numpy mask, ``True`` means masked, while ``False`` means unmasked
# thus all masks should be ``True`` where pixels should be removed.
# 1. Intensity
# This rule may be removed eventually after fixing 2. Peak
rule_intensity = data < 40.0 # type: np.ndarray
# 2. Peak
# TODO improve performance here
rule_peak = np.ones(rule_intensity.shape, dtype=rule_intensity.dtype)
generic_filter(data, self._above_background, output=rule_peak, size=23)
self.steiner_mask = np.logical_and(rule_peak, rule_intensity)
data[self.steiner_mask] = self.mask_value
# 3. Neighbor
# Probably shouldn't need to make a logical and with the mask, as it
# should be at least equal to it.
rule_neighbor = -self._surrounding_area(data)
self.steiner_mask = np.logical_and(self.steiner_mask, rule_neighbor)
self.steiner_mask = np.logical_or(self.steiner_mask, self.mask)
def steiner_filter(self):
"""
Steiner Filter is based on the Steiner Method Steiner et al. (1995) for
filtering convective rainfall from a radar image.
This method follow 3 rules, which should be applied to every point the
grid:
1. Intensity: Any point above 40dBZ is a Convective Point
2. Peak: Any point above a threshold (a) over the mean local rain
(11 km radius circle) is a Convective Point
3. Neighbor: Every point around a certain radius (b) around a Convective
point is also a Convective Point
(a) is the threshold
(b) is given by the static method convective_radius, in this class
"""
data = np.copy(self.data)
# On a numpy mask, ``True`` means masked, while ``False`` means unmasked
# thus all masks should be ``True`` where pixels should be removed.
# 1. Intensity
# This rule may be removed eventually after fixing 2. Peak
rule_intensity = data < 40.0 # type: np.ndarray
# 2. Peak
# TODO improve performance here
rule_peak = np.ones(rule_intensity.shape, dtype=rule_intensity.dtype)
generic_filter(data, self._above_background, output=rule_peak, size=23)
self.steiner_mask = np.logical_and(rule_peak, rule_intensity)
data[self.steiner_mask] = self.mask_value
# 3. Neighbor
# Probably shouldn't need to make a logical and with the mask, as it
# should be at least equal to it.
rule_neighbor = -self._surrounding_area(data)
self.steiner_mask = np.logical_and(self.steiner_mask, rule_neighbor)
self.steiner_mask = np.logical_or(self.steiner_mask, self.mask)
def plus_filter(X, f):
"""Scans a +-shaped filter over the input matrix X, applies
the reducer function f and returns a new matrix with the same
dimensions of X containing the reduced values.
This kind of technique is useful for a tonne of stuff, and
very efficient.
"""
footprint = np.array([[0, 1, 0], [1, 1, 1], [0, 1, 0]])
proc = generic_filter(X, f, footprint=footprint, mode='wrap')
return proc
def Sobel(img, threshold=50):
def kernel(p):
return (np.abs((p[0] + 2 * p[1] + p[2]) - (p[6] + 2 * p[7] + p[8])) +
np.abs((p[2] + 2 * p[6] + p[7]) - (p[0] + 2 * p[3] + p[6])))
res = generic_filter(img, kernel, (3, 3))
res = np.array(list(
map(lambda x: [255 if xx > threshold else 0 for xx in x], res)),
dtype=res.dtype)
return res
def make_distanses(self):
self.matrix_1=self.matrix
for i in range(50):
self.matrix_1=filters.generic_filter(self.matrix_1,self.erode,3)
self.distances+=self.matrix_1
self.conturs[self.distances == 12]=1
self.conturs[self.conturs==0]=np.nan
self.distances_perf=np.round( self.distances*np.random.uniform(0.3,4,self.distances.shape) )
def collapse_to_grid(E_coded,grid_time,grid_frequency,num_codes,
do_grid_subsampling =True):
full_grid = np.dstack(tuple(
generic_filter(E_coded,lambda x: np.any(x==i).astype(np.uint8),
size = (grid_time,
grid_frequency))
for i in xrange(num_codes)))
if do_grid_subsampling:
return full_grid[::grid_time,::grid_frequency]
else:
return full_grid
def gamma_evaluation(sample, reference, distance, threshold, resolution, signed=False):
"""
Distance to Agreement between a sample and reference using gamma evaluation.
Parameters
----------
sample : ndarray
Sample dataset, simulation output for example
reference : ndarray
Reference dataset, what the `sample` dataset is expected to be
distance : int
Search window limit in the same units as `resolution`
threshold : float
The maximum passable deviation in `sample` and `reference`
resolution : tuple
The resolution of each axis of `sample` and `reference`
signed : bool
Returns signed gamma for identifying hot/cold fails
Returns
-------
gamma_map : ndarray
g == 0 (pass) the sample and reference pixels are equal
0 < g <= 1 (pass) agreement within distance and threshold
g > 1 (fail) no agreement
"""
ndim = len(resolution)
assert sample.ndim == reference.ndim == ndim, \
"`sample` and `reference` dimensions must equal `resolution` length"
assert sample.shape == reference.shape, \
"`sample` and `reference` must have the same shape"
resolution = numpy.array(resolution)[[numpy.newaxis for i in range(ndim)]].T
slices = [slice(-ceil(distance/r), ceil(distance/r)+1) for r in resolution]
kernel = numpy.mgrid[slices] * resolution
kernel = numpy.sum(kernel**2, axis=0) # Distance squared from central voxel.
kernel[numpy.where(numpy.sqrt(kernel) > distance)] = numpy.inf
kernel = kernel / distance**2
footprint = numpy.ones_like(kernel)
kernel = kernel.flatten()
values = (reference - sample)**2 / (threshold)**2
gamma_map = generic_filter(values, \
lambda vals: numpy.minimum.reduce(vals + kernel), footprint=footprint)
gamma_map = numpy.sqrt(gamma_map)
if (signed):
return gamma_map * numpy.sign(sample - reference)
else:
return gamma_map
def distance_map(self):
self.d_map = np.zeros(self.data.shape)
self.matrix = np.copy(self.data)
self.d_map += self.matrix
for i in range(50):
self.matrix = filters.generic_filter(self.matrix, self.erode, size=(3, 3, 3, 1))
self.d_map += self.matrix
if np.sum(self.matrix) == 0:
break
print i
def ifcb_segment(img):
Y = img_as_float(img)
# step 1. local variance
Yv = rescale_intensity(generic_filter(Y, np.var, footprint=disk(3)))
# step 2. threshold local variance, aggressively
Ye = Yv > (threshold_otsu(Yv) / 2.)
# step 3. dark areas
Yt = Y < threshold_otsu(Y)
thin_blob = Ye | Yt
# step 4. morphological reconstruction
seed = np.copy(thin_blob)
seed[1:-1,1:-1] = 1
four=np.disk(1).astype(np.bool)
return reconstruction(seed,thin_blob,method='erosion',selem=four)
def dilate_raster(array, kernel_size=3, threshold=120):
'''smooth the borders of areas exceeding the given threshold,
so that these areas shrink by half the kernel-size along their borders'''
thresh_exceeded = array >= threshold
ret = np.where(thresh_exceeded, np.nan, array)
o = kernel_size // 2
filtered = filters.generic_filter(
ret, np.nanmedian, (kernel_size, kernel_size), origin=(o, o),
mode='reflect')
a = array.copy()
thresh_exceeded_and_not_nan = thresh_exceeded & ~ np.isnan(filtered)
fill_values = filtered[thresh_exceeded]
a[thresh_exceeded_and_not_nan] = filtered[thresh_exceeded_and_not_nan]
return a
def _local_minima_filter(self, input, size, threshold=0.):
if size%2 != 1:
raise ValueError, "size must be an odd number"
half_size = size//2
output = generic_filter(input, self._local_minima_func, size=size, \
mode='wrap', extra_keywords={'size': size, 'threshold': threshold})
# Mask the extreme latitudes
output[:half_size,:] = 0.
output[-half_size:,:] = 0.
return output
def extractMesh(settings,obj):
'''
Extracts semi-3D mesh using ImageJ-generated heightmap.
'''
# Start timer on object processing
start = time.time()
# Resize height map and focused RGB image, and invert height map if macro = True
hmap_resized,rgb_resized = imagePreparation(settings,obj)
# Get 2D binary outline map for background removal
edge,image_clean,image_clean_unfilled = extractoutline.extractOutline(settings,obj.name,rgb_resized,True)
# Remove background in height map by performing element-wise multiplication with binary outline map from run2dmorph
hmap_no_BG = hmap_resized * (image_clean / 255)
# Convert pixel greyscale values from background-pruned height map to real-world heights
heights = pixelToHeight(hmap_no_BG,settings['slices'],settings['zstep'])
# Run neighborhood filter to remove outliers
k = settings['kernel_outlierfilter'] # Kernel size
filtered = generic_filter(heights,outlierFilter,(k,k))
# Get number of pixels on each z-level
counts = countPerLevel(filtered)
# Delete outliers from filtered heights
no_outliers = deleteOutliers(filtered,counts)
# Get length, width, and top and bottom heights
length,width,bottom_height,top_height = getTopBottom(image_clean,no_outliers)
# If aperture present, set aperture height to average height. Also extract length, width,
# and top and bottom heights
final_heights = aperture(image_clean,image_clean_unfilled,no_outliers,bottom_height)
# Extract mesh from x,y,z point cloud
z_values,triangulation,triangles,faceColors = meshDelaunay(settings,final_heights)
# Write 3D x,y,z-coordinates file
writeCoordinates(obj,triangulation)
end = time.time()
time_elapsed = end - start
print '\tINFO: Time elapsed: {0:.3f} seconds\n'.format(time_elapsed)
return edge,image_clean,triangulation,triangles,faceColors,length,width,bottom_height,top_height
def get_warmest_index_old(t11, matched):
from scipy.ndimage.filters import generic_filter
row, col = np.indices(t11.shape)
flat_index = generic_filter(t11,
function=np.argmax,
size=5,
mode='constant',
cval=-9999999999999)
flat_index = np.array(flat_index, dtype=np.int)
delta_row, delta_col = np.unravel_index(flat_index, (5,5))
delta_row = delta_row - 2
delta_col = delta_col - 2
new_row = row+delta_row
new_col = col+delta_col
new_row_matched = np.array([new_row[matched['row'][idx], matched['col'][idx]]
for idx in range(matched['row'].shape[0])])
new_col_matched = np.array([new_col[matched['row'][idx], matched['col'][idx]]
for idx in range(matched['row'].shape[0])])
return new_row_matched, new_col_matched
def _z_to_r_enhanced_mdfilt(z, mode='mirror'):
"""multidimensional version
assuming the two last dimensions represent a 2-D image
Uses :func:`scipy:scipy.ndimagefilters.generic_filter` to reduce the number
of for-loops even more.
"""
# get the shape of the input
# dimy = z.shape[-2]
# dimx = z.shape[-1]
# calculate the decibel values from the input
db = decibel(z)
# set up our output arrays
r = np.zeros(z.shape)
size = list(z.shape)
size[-2:] = [3, 3]
size[:-2] = [1] * len(size[:-2])
size = tuple(size)
si = filters.generic_filter(db, z_to_r_esifilter, size=size, mode=mode)
gt44 = db > 44.
r[gt44] = z_to_r(z[gt44], a=77, b=1.9)
si[gt44] = -1.
# the same is true for values between 36.5 and 44 dBZ
bt3644 = (db >= 36.5) & (db <= 44.)
r[bt3644] = z_to_r(z[bt3644], a=200, b=1.6)
si[bt3644] = -2.
si1 = (si >= 0.)
si2 = si1 & (si < 3.5)
si3 = si1 & ~si2 & (si <= 7.5)
si4 = si > 7.5
r[si2] = z_to_r(z[si2], a=125, b=1.4)
r[si3] = z_to_r(z[si3], a=200, b=1.6)
r[si4] = z_to_r(z[si4], a=320, b=1.4)
return r, si
def stddev(parameters):
"""Calculates the local standard deviation.
It wraps `scipy.ndimage.filters.minimum_filter`. The `footprint`,
`output`, `mode`, `cval` and `origin` options are not supported.
Keep in mind that `mode` and `cval` influence the results. In this case
the default mode is used, `reflect`.
:param parameters['data'][0]: input array
:type parameters['data'][0]: numpy.array
:param parameters['size']: which neighbours to take into account, defaults
to (3, 3) a.k.a. numpy.ones((3, 3))
:type parameters['size']: list
:return: numpy.array
"""
data = parameters['data'][0].astype('float')
size = parameters.get('size', [3, 3])
return generic_filter(data, standard_deviation, size=tuple(size))
def find_peaks_indexes(arr, window_width=5, threshold=0.0, fpeak=0):
"""Find indexes of peaks in a 1d array.
Note that window_width must be an odd number. The function imposes that the
fluxes in the window_width /2 points to the left (and right) of the peak
decrease monotonously as one moves away from the peak, except that
it allows fpeak constant values around the peak.
Parameters
----------
arr : 1d numpy array
Input 1D spectrum.
window_width : int
Width of the window where the peak must be found. This number must be
odd.
threshold : float
Minimum signal in the peak (optional).
fpeak: int
Number of equal values around the peak
Returns
-------
ipeaks : 1d numpy array (int)
Indices of the input array arr in which the peaks have been found.
"""
_check_window_width(window_width)
if (fpeak<0 or fpeak + 1 >= window_width):
raise ValueError('fpeak must be in the range 0- window_width - 2')
kernel_peak = kernel_peak_function(threshold, fpeak)
out = generic_filter(arr, kernel_peak, window_width, mode="reflect")
result, = numpy.nonzero(out)
return filter_array_margins(arr, result, window_width)
def check_scaling_window_finder(l1b, integration):
to_filter = l1b.get_integration('raw_dn_s', integration)
x = max(to_filter.shape[0] // 10, 1)
y = max(to_filter.shape[1] // 10, 1)
size = (x, y)
print("Img shape:", to_filter.shape)
print("Kernel size:", size)
filtered = generic_filter(to_filter, np.std, size=size,
mode='constant', cval=to_filter.max() * 100)
min_spa, min_spe = np.unravel_index(filtered.argmin(), to_filter.shape)
print("Minimum:", filtered.min())
print("Minimum coords", min_spa, min_spe)
spa1 = min_spa - size[0] // 2
if spa1 < 0:
spa1 = 0
spa2 = spa1 + size[0]
if spa2 > to_filter.shape[0]:
spa1 = to_filter.shape[0] - size[0]
spa2 = to_filter.shape[0]
print("Spatial:", spa1, spa2)
spe1 = min_spe - size[1] // 2
if spe1 < 0:
spe1 = 0
spe2 = spe1 + size[1]
if spe2 > to_filter.shape[1]:
spe1 = to_filter.shape[1] - size[1]
spe2 = to_filter.shape[1]
print("Spectral:", spe1, spe2)
fig, axes = plt.subplots(nrows=3)
axes[0].imshow(np.log(to_filter), cmap=mycmap)
axes[0].add_patch(get_rectangle(to_filter))
axes[1].imshow(np.log(filtered), cmap=mycmap, vmax=0.1)
axes[1].add_patch(get_rectangle(to_filter))
axes[2].hist(filtered[~np.isnan(filtered)].ravel(), bins=100)
def automatic_outline_michalis( imgs, o, sl, tp, scalefactor = 1 ):
'''
outline[0] = head
outline[1] = tail
'''
minsl = 0#np.clip( np.min( [ outline[0][-1], outline[-1][-1] ] ), 0, len(imgs) )
maxsl = 19#np.clip( np.max( [ outline[0][-1], outline[-1][-1] ] ), 0, len(imgs) )
# compute the max over the stack
img = np.max( imgs[minsl:maxsl+1], 0 )
# resize the image
Nbig = img.shape[0]
Nsmall = img.shape[0]/scalefactor
smallimg = img.reshape([Nsmall, Nbig/Nsmall, Nsmall, Nbig/Nsmall]).mean(3).mean(1)
# compute local variance with generic filter function
varimg = filters.generic_filter( smallimg, np.var, size=2 ).astype('uint16')
thr = threshold_otsu( varimg )
labels = measure.label( morphology.binary_dilation( varimg>thr, disk(2) ) )
labels = remove_small_objects( labels , 12 )
pos = [ [ scalefactor*i[ 'centroid' ][1], scalefactor*i[ 'centroid' ][0] ] for i in measure.regionprops(labels) ]
sortedpos = np.array([o[0]])
for i in np.arange(len(pos)):
# print(len(pos))
idx = find_closest_point(sortedpos[-1],pos)
newsl = minsl + list(imgs[minsl:,pos[idx][1],pos[idx][0]]).index(np.max(imgs[minsl:,pos[idx][1],pos[idx][0]]))
pos[idx].append(newsl)
sortedpos = np.append( sortedpos, np.array( [ pos[idx] ] ), axis=0 )
pos.pop(idx)
sortedpos = np.append( sortedpos, np.array( [o[-1]] ), axis=0 )
return sortedpos
def sharpness(image, edge_threshold=0.0001, w=5, t=1.0):
"""
Code implemented by the following article:
Sharpness Estimation for Document and Scene Images,
Kumar, Chen, Doermann
"""
# Median filtering
w_size = (w * 2) + 1
image = util.img_as_float(image)
image_m = util.img_as_float(median(image, mph.square(3)))
# Window functions
def dom_func(window):
# import pdb; pdb.set_trace()
return abs(
abs(window[4] - window[2]) - abs(window[2] - window[0])
)
def contrast_func(window):
# print window
s = 0.0
for i in xrange(0, len(window) - 1):
# print i
s += abs(window[i] - window[i+1])
return s
# Delta DoM in horizontal direction
dom_x_values = generic_filter(image_m, dom_func,
size=(1, 5),
mode='reflect')
# Delta DoM in vertical direction
dom_y_values = generic_filter(image_m, dom_func,
size=(5, 1),
mode='reflect')
dom_x = generic_filter(
dom_x_values, lambda w: sum(w),
size=(1, w_size), mode='reflect')
dom_y = generic_filter(
dom_y_values, lambda w: sum(w),
size=(w_size, 1), mode='reflect')
edges_x = vsobel(image)
# Normalize
edges_x *= (1.0 / edges_x.max())
edges_x_pixels = len(edges_x[edges_x > edge_threshold].ravel())
edges_y = hsobel(image)
# Normalize
edges_y *= (1.0 / edges_y.max())
edges_y_pixels = len(edges_y[edges_y > edge_threshold].ravel())
# Contrast in horizontal direction
contrast_x = generic_filter(image, contrast_func,
size=(1, w_size + 1),
mode='reflect')
# Contrast in vertical direction
contrast_y = generic_filter(image, contrast_func,
size=(w_size + 1, 1),
mode='reflect')
sharpness_x = dom_x / contrast_x
sharpness_y = dom_y / contrast_y
# import pdb; pdb.set_trace()
sharp_x_pixels = len(np.where(
sharpness_x[edges_x > edge_threshold] > t
)[0])
sharp_y_pixels = len(np.where(
sharpness_y[edges_y > edge_threshold] > t
)[0])
# import pdb; pdb.set_trace()
if edges_x_pixels > 0:
rx = (float(sharp_x_pixels) / edges_x_pixels)
else:
rx = 1
if edges_y_pixels > 0:
ry = (float(sharp_y_pixels) / edges_y_pixels)
else:
ry = 1
final_estimate = np.sqrt(
(rx ** 2) + (ry ** 2)
)
return final_estimate
def rag_mean_color(image, labels, connectivity=2, mode='distance',
sigma=255.0):
"""Compute the Region Adjacency Graph using mean colors.
Given an image and its initial segmentation, this method constructs the
corresponding Region Adjacency Graph (RAG). Each node in the RAG
represents a set of pixels within `image` with the same label in `labels`.
The weight between two adjacent regions represents how similar or
dissimilar two regions are depending on the `mode` parameter.
Parameters
----------
image : ndarray, shape(M, N, [..., P,] 3)
Input image.
labels : ndarray, shape(M, N, [..., P,])
The labelled image. This should have one dimension less than
`image`. If `image` has dimensions `(M, N, 3)` `labels` should have
dimensions `(M, N)`.
connectivity : int, optional
Pixels with a squared distance less than `connectivity` from each other
are considered adjacent. It can range from 1 to `labels.ndim`. Its
behavior is the same as `connectivity` parameter in
`scipy.ndimage.filters.generate_binary_structure`.
mode : {'distance', 'similarity'}, optional
The strategy to assign edge weights.
'distance' : The weight between two adjacent regions is the
:math:`|c_1 - c_2|`, where :math:`c_1` and :math:`c_2` are the mean
colors of the two regions. It represents the Euclidean distance in
their average color.
'similarity' : The weight between two adjacent is
:math:`e^{-d^2/sigma}` where :math:`d=|c_1 - c_2|`, where
:math:`c_1` and :math:`c_2` are the mean colors of the two regions.
It represents how similar two regions are.
sigma : float, optional
Used for computation when `mode` is "similarity". It governs how
close to each other two colors should be, for their corresponding edge
weight to be significant. A very large value of `sigma` could make
any two colors behave as though they were similar.
Returns
-------
out : RAG
The region adjacency graph.
Examples
--------
>>> from skimage import data, segmentation
>>> from skimage.future import graph
>>> img = data.astronaut()
>>> labels = segmentation.slic(img)
>>> rag = graph.rag_mean_color(img, labels)
References
----------
.. [1] Alain Tremeau and Philippe Colantoni
"Regions Adjacency Graph Applied To Color Image Segmentation"
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.11.5274
"""
graph = RAG()
# The footprint is constructed in such a way that the first
# element in the array being passed to _add_edge_filter is
# the central value.
fp = nd.generate_binary_structure(labels.ndim, connectivity)
for d in range(fp.ndim):
fp = fp.swapaxes(0, d)
fp[0, ...] = 0
fp = fp.swapaxes(0, d)
# For example
# if labels.ndim = 2 and connectivity = 1
# fp = [[0,0,0],
# [0,1,1],
# [0,1,0]]
#
# if labels.ndim = 2 and connectivity = 2
# fp = [[0,0,0],
# [0,1,1],
# [0,1,1]]
filters.generic_filter(
labels,
function=_add_edge_filter,
footprint=fp,
mode='nearest',
output=np.zeros(labels.shape, dtype=np.uint8),
extra_arguments=(graph,))
for n in graph:
graph.node[n].update({'labels': [n],
'pixel count': 0,
'total color': np.array([0, 0, 0],
dtype=np.double)})
for index in np.ndindex(labels.shape):
current = labels[index]
graph.node[current]['pixel count'] += 1
graph.node[current]['total color'] += image[index]
for n in graph:
graph.node[n]['mean color'] = (graph.node[n]['total color'] /
graph.node[n]['pixel count'])
for x, y, d in graph.edges_iter(data=True):
diff = graph.node[x]['mean color'] - graph.node[y]['mean color']
diff = np.linalg.norm(diff)
if mode == 'similarity':
d['weight'] = math.e ** (-(diff ** 2) / sigma)
elif mode == 'distance':
d['weight'] = diff
else:
raise ValueError("The mode '%s' is not recognised" % mode)
return graph
from astropy.io import fits
from astropy.table import Table
import astropy.wcs as wcs
import numpy as np
from scipy.ndimage.interpolation import map_coordinates
from scipy.ndimage.filters import generic_filter
t = Table.read('../measurements/m83.co10.K_props_clfind.fits')
hdu = fits.open('../data/NGC_5236_RO_MOM1:I:HI:wbb2008.fits')
w = wcs.WCS(hdu[0].header)
mom1 = np.squeeze(hdu[0].data)
mom1 = generic_filter(mom1,np.nanmedian,size=(11,11))
x,y,s,v = w.wcs_world2pix(t['XPOS'].data,t['YPOS'].data,np.zeros(len(t)),np.zeros(len(t)),0)
vvals = mom1[y.astype(np.int),x.astype(np.int)]
dv = (vvals/1e3-t['VPOS'].data+22.3)
def spatial_ave(data):
#use a uniform filter to get the background
data_unif = filters.uniform_filter(data,size=11)
data_std = filters.generic_filter(data,np.std,size=11)
return data_unif,data_std
import numpy as np
from scipy.ndimage.filters import generic_filter
data = np.arange(100).reshape((10,10))
sz = 3
midpt = 5
identity = np.ones((sz,sz))
def cb(arr):
# The arr passed here is flattened!
diff = (np.sum( (arr[midpt] - arr)**2, 0))**.5
return diff
res = generic_filter(data, cb, footprint=identity)
print res
def _remove_dup_laplace(self, data, mask, size=5):
laplacian = np.multiply(laplace(data, mode='wrap'), mask)
return generic_filter(laplacian, self._local_max_laplace, size=size, mode='wrap',
extra_keywords={'size': size})
