def plot_phases(in_file, plot_type, plot_log):
flags = ['histogram','phases']
plot_flag = 0
log_flag = 0
def no_log(x):
return x
fig = pylab.figure(1)
ax = fig.add_subplot(111)
try:
img = spimage.sp_image_read(in_file,0)
except:
raise IOError("Can't read %s." % in_file)
values = img.image.reshape(pylab.size(img.image))
if plot_log:
log_function = pylab.log
else:
log_function = no_log
if plot_type == PHASES:
hist = pylab.histogram(pylab.angle(values),bins=500)
ax.plot((hist[1][:-1]+hist[1][1:])/2.0,log_function(hist[0]))
elif plot_flag == HISTOGRAM:
hist = pylab.histogram2d(pylab.real(values),pylab.imag(values),bins=500)
ax.imshow(log_function(hist[0]),extent=(hist[2][0],hist[2][-1],-hist[1][-1],-hist[1][0]),interpolation='nearest')
else:
ax.plot(pylab.real(values),pylab.imag(values),'.')
return fig
def plot_phases(in_file, plot_type, plot_log):
plot_flag = 0
def no_log(x):
return x
fig = pylab.figure(1)
ax = fig.add_subplot(111)
try:
img = spimage.sp_image_read(in_file, 0)
except IOError:
raise IOError("Can't read %s." % in_file)
values = img.image.reshape(pylab.size(img.image))
if plot_log:
log_function = pylab.log
else:
log_function = no_log
if plot_type == PHASES:
hist = pylab.histogram(pylab.angle(values), bins=500)
ax.plot((hist[1][:-1] + hist[1][1:]) / 2, log_function(hist[0]))
elif plot_flag == HISTOGRAM:
hist = pylab.histogram2d(pylab.real(values),
pylab.imag(values),
bins=500)
ax.imshow(log_function(hist[0]),
extent=(hist[2][0], hist[2][-1], -hist[1][-1], -hist[1][0]),
interpolation='nearest')
else:
ax.plot(pylab.real(values), pylab.imag(values), '.')
return fig
def GetData(datafile, N, seed, Nsamples = 0, bonds = [], Z = [], X = [], ZZ = [], beta = 1.0):
# Either from a pre-generated set
if (datafile is not None):
data = np.loadtxt(datafile, dtype="int")
if data.ndim == 1: (Nsamples, Nclamped) = (1, len(data)); data = [data]
else: (Nsamples, Nclamped) = data.shape
if Nclamped>N:
print 'Training set vectors exceed the graph size'
return 0
# Or generate it from a Hamiltonian at a given beta with help of ED
else:
Nclamped = N
if Nclamped>N:
print 'Training set vectors exceed the graph size'
return 0
BM = bm.BoltzmannMachine(N, bonds, Z, X, ZZ , beta)
probTable = np.zeros(2**Nclamped)
for i in range(2**Nclamped):
cbits = bitfield(i) # convert i to a list of bits
cbits = [0]*(Nclamped-len(cbits))+cbits.tolist() # keep the list length constant
BM.setProjector(cbits)
if i==0: probTable[i] = real(BM.evaluateProjector())
else: probTable[i] = probTable[i-1] + real(BM.evaluateProjector())
rm.seed(seed)
data = []
for i in range(Nsamples):
RN = rm.random()
index = np.searchsorted(probTable, RN)
cbits = bitfield(index)
cbits = [0]*(Nclamped-len(cbits))+cbits.tolist() # keep the list length constant
data += [cbits]
del BM
# Find unique states and count them
udata = []
cdata = collections.OrderedDict()
for i,d in enumerate(data):
if not(d.tolist() in udata): udata += [d.tolist()]; cdata[repr(d)] = 1
else: cdata[repr(d)] += 1
weights = np.array(cdata.values())/float(Nsamples)
data = udata
return data, weights
def update(self, img):
img_now = ops.read_image(img)
if img_now.ndim == 3:
img_now = ops.rgb2gray(img_now)
x = ops.get_subwindow(img_now, self.pos, self.sz, self.cos_window)
# print(x)
k = ops.dense_gauss_kernel(self.sigma, x, self.z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(self.alphaf, kf)
response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
r = response
row, col = pylab.unravel_index(r.argmax(), r.shape)
self.pos = self.pos - pylab.floor(self.sz / 2) + [row, col]
x = ops.get_subwindow(img_now, self.pos, self.sz, self.cos_window)
k = ops.dense_gauss_kernel(self.sigma, x)
new_alphaf = pylab.divide(self.yf,
(pylab.fft2(k) + self.lambda_value)) # Eq. 7
new_z = x
f = self.interpolation_factor
self.alphaf = (1 - f) * self.alphaf + f * new_alphaf
self.z = (1 - f) * self.z + f * new_z
box_new = np.array([
self.pos[1] - (self.sz[1]) / 2 + 1, self.pos[0] -
(self.sz[0]) / 2 + 1, self.sz[1], self.sz[0]
],
dtype=np.float32)
return box_new
def chebt1(f):
#TODO
"""chebyshev transformation, see chebfun"""
n = len(f)
oncircle = concatenate((f[-1::-1], f[1:-1]))
fftcoef = real(fft(oncircle))/(2*n-2)
return fftcoef[n-1::-1]
def dense_gauss_kernel(sigma, x, y=None):
xf = pylab.fft2(x) # x in Fourier domain
x_flat = x.flatten()
xx = pylab.dot(x_flat.transpose(), x_flat) # squared norm of x
if y is not None:
yf = pylab.fft2(y)
y_flat = y.flatten()
yy = pylab.dot(y_flat.transpose(), y_flat)
else:
yf = xf
yy = xx
xyf = pylab.multiply(xf, pylab.conj(yf))
xyf_ifft = pylab.ifft2(xyf)
row_shift, col_shift = pylab.floor(pylab.array(x.shape) / 2).astype(int)
xy_complex = pylab.roll(xyf_ifft, row_shift, axis=0)
xy_complex = pylab.roll(xy_complex, col_shift, axis=1)
xy = pylab.real(xy_complex)
scaling = -1 / (sigma**2)
xx_yy = xx + yy
xx_yy_2xy = xx_yy - 2 * xy
k = pylab.exp(scaling * pylab.maximum(0, xx_yy_2xy / x.size))
return k
def f( t, *args ):
for i,arg in enumerate(args): params[ free_params[i] ] = arg
tshift = params[-1]
ideal = fmodel( t, *args )
irf = cspline1d_eval( self.irf_generator, t-tshift, dx=self.irf_dt, x0=self.irf_t0 )
convoluted = pylab.real(pylab.ifft( pylab.fft(ideal)*pylab.fft(irf) )) # very small imaginary anyway
return convoluted
def chebt1(f):
#TODO
"""chebyshev transformation, see chebfun"""
n = len(f)
oncircle = concatenate((f[-1::-1], f[1:-1]))
fftcoef = real(fft(oncircle)) / (2 * n - 2)
return fftcoef[n - 1::-1]
def _istftm(self, X_hat=None, Phi_hat=None, pvoc=False, usewin=True, resamp=None):
"""
::
Inverse short-time Fourier transform magnitude. Make a signal from a |STFT| transform.
Uses phases from self.STFT if Phi_hat is None.
Inputs:
X_hat - N/2+1 magnitude STFT [None=abs(self.STFT)]
Phi_hat - N/2+1 phase STFT [None=exp(1j*angle(self.STFT))]
pvoc - whether to use phase vocoder [False]
usewin - whether to use overlap-add [False]
Returns:
x_hat - estimated signal
"""
if not self._have_stft:
return None
X_hat = P.np.abs(self.STFT) if X_hat is None else P.np.abs(X_hat)
if pvoc:
self._pvoc(X_hat, Phi_hat, pvoc)
else:
Phi_hat = P.angle(self.STFT) if Phi_hat is None else Phi_hat
self.X_hat = X_hat * P.exp( 1j * Phi_hat )
if usewin:
self.win = P.hanning(self.nfft)
self.win *= 1.0 / ((float(self.nfft)*(self.win**2).sum())/self.nhop)
else:
self.win = P.ones(self.nfft)
if resamp:
self.win = sig.resample(self.win, int(P.np.round(self.nfft * resamp)))
fp = self._check_feature_params()
self.x_hat = self._overlap_add(P.real(self.nfft * P.irfft(self.X_hat.T)), usewin=usewin, resamp=resamp)
if self.verbosity:
print "Extracted iSTFTM->self.x_hat"
return self.x_hat
def mfreqz(self, b,a=1):
'''
plotting freqz of filter , like matlab representation.
:param b: nominator
:param a: denominator
default: a = 1
'''
from matplotlib import pyplot as plt
from pylab import unwrap, arctan2, imag, real, log10
w, h = signal.freqz(b,a)
h_dB = 20 * log10(abs(h))
plt.subplot(211)
plt.plot(w/max(w), h_dB)
plt.grid()
plt.ylim(-150, 5)
plt.ylabel('Magnitude (db)')
plt.xlabel(r'Normalized Frequency (x$\pi$rad/sample)')
plt.title(r'Frequency response')
plt.subplot(212)
h_Phase = unwrap(arctan2(imag(h),real(h)))
plt.plot(w/max(w),h_Phase)
plt.grid()
plt.ylabel('Phase (radians)')
plt.xlabel(r'Normalized Frequency (x$\pi$rad/sample)')
plt.title(r'Phase response')
plt.subplots_adjust(hspace=0.5)
plt.show(block=False)
def ichebt2(c):
"""inverse chebyshev transformation, values of function in Chebyshev
nodes of the second kind, see chebfun for details"""
n = len(c)
oncircle = concatenate(([c[-1]],c[-2:0:-1]/2, c[0:-1]/2));
v = real(ifft(oncircle));
f = (n-1)*concatenate(([2*v[0]], v[1:n-1]+v[-1:n-1:-1], [2*v[n-1]] ))
return f
def ichebt2(c):
"""inverse chebyshev transformation, values of function in Chebyshev
nodes of the second kind, see chebfun for details"""
n = len(c)
oncircle = concatenate(([c[-1]],c[-2:0:-1]/2, c[0:-1]/2));
v = real(ifft(oncircle));
f = (n-1)*concatenate(([2*v[0]], v[1:n-1]+v[-1:n-1:-1], [2*v[n-1]] ))
return f
def get_undef_blade():
blade = {}
blade["tower"] = py.array(
[[0.0, 4.15 / 2, 4.15 / 2, -4.15 / 2, -4.15 / 2, 0.0],
[0.0, 0.0, 115.63, 115.63, 0.0, 0.0]])
blade["shaft"] = py.array(
[[
blade["tower"][0, 1],
blade["tower"][0, 1] - 7.1 * py.cos(5 * py.pi / 180)
],
[
blade["tower"][1, 2] + 2.75,
blade["tower"][1, 2] + 2.75 + abs(7.1) * py.sin(5 * py.pi / 180)
]])
shaft_tan = py.diff(blade["shaft"])
shaft_tan = shaft_tan[0] + 1j * shaft_tan[1]
shaft_tan /= abs(shaft_tan)
shaft_normal = shaft_tan * 1j
blade["hub_fun"] = lambda r: blade["shaft"][0, -1] + 1j * blade["shaft"][
1, -1] + r * shaft_normal
blade["hub"] = py.array(
[[py.real(blade["hub_fun"](0)),
py.real(blade["hub_fun"](2.8))],
[py.imag(blade["hub_fun"](0)),
py.imag(blade["hub_fun"](2.8))]])
cone = -2.5 * py.pi / 180 # Cone angle
blade_normal = (py.cos(cone) + 1j * py.sin(cone)) * shaft_normal
blade["blade_fun"] = lambda r, R, defl: blade["hub"][0, -1] + 1j * blade[
"hub"
][
1, -1
] + r * blade_normal + r / R * 2.332 * blade_normal / 1j + defl * blade_normal / 1j
R = 86.366
blade["blade"] = py.array([[
py.real(blade["blade_fun"](0, R, 0)),
py.real(blade["blade_fun"](R, R, 0))
],
[
py.imag(blade["blade_fun"](0, R, 0)),
py.imag(blade["blade_fun"](R, R, 0))
]])
#print(py.angle(blade_normal)*180/py.pi,py.angle(shaft_normal)*180/py.pi)
return (blade)
def fracdiff(x, d):
T = len(x)
np2 = int(2**np.ceil(np.log2(2 * T - 1)))
k = np.arange(1, T)
b = (1, ) + tuple(np.cumprod((k - d - 1) / k))
z = (0, ) * (np2 - T)
z1 = b + z
z2 = tuple(x) + z
dx = pl.ifft(pl.fft(z1) * pl.fft(z2))
return pl.real(dx[0:T])
def voiSb(xp, sigma, gamma) :
z = (xp+1j*gamma)/(sigma*pylab.sqrt(2))
ff = scipy.special.wofz(z)
vf = pylab.real(ff)
#CC = pylab.array(vf)
#CCNormalised = CC/CC.max()
#CC = CCNormalised*a
return pylab.array(vf)
def chebt2(f):
"""chebyshev transformation, coefficients in expansion using
Chebyshev polynomials T_n(x), see chebfun for details"""
n = len(f)
oncircle = concatenate((f[-1::-1], f[1:-1]))
fftcoef = real(fft(oncircle)) / (2 * n - 2)
#print n, len(fftcoef)
#print fftcoef[n-1:]
#print fftcoef[n-1:0:-1]
fftcoef[n - 1:0:-1] += fftcoef[n - 1:] # z+conj(z)
return fftcoef[n - 1::-1]
def FourierDerivative(f):
"""
this derivatie just works for periodic 2*pi multiple series
have to figure out how to make that work for any function
"""
N = np.size(f)
n = np.arange(0, N)
# df discrete differential operator
df = np.complex(0, 1) * py.fftshift(n - N / 2)
dfdt = py.ifft(df * py.fft(f))
return py.real(dfdt)
def plot_complex_(ax, z):
verts = map(lambda z: (real(z), imag(z)), z)
codes = [Path.MOVETO
] + [Path.LINETO] * (len(verts) - 2) + [Path.CLOSEPOLY]
path = mpath.Path(verts, codes)
patch = mpatches.PathPatch(path,
facecolor=[1, 0.5, 0.8],
edgecolor='black',
alpha=1)
ax.add_patch(patch)
def FourierDerivative(f):
"""
this derivatie just works for periodic 2*pi multiple series
have to figure out how to make that work for any function
"""
N = np.size(f)
n = np.arange(0,N)
# df discrete differential operator
df = np.complex(0,1)*py.fftshift(n-N/2)
dfdt = py.ifft( df*py.fft(f) )
return py.real(dfdt)
def chebt2(f):
"""chebyshev transformation, coefficients in expansion using
Chebyshev polynomials T_n(x), see chebfun for details"""
n = len(f)
oncircle = concatenate((f[-1::-1], f[1:-1]))
fftcoef = real(fft(oncircle))/(2*n-2)
#print n, len(fftcoef)
#print fftcoef[n-1:]
#print fftcoef[n-1:0:-1]
fftcoef[n-1:0:-1] += fftcoef[n-1:] # z+conj(z)
return fftcoef[n-1::-1]
def update_ret_response(self, new_img):
'''
:param new_img: new frame should be normalized, for tracker_status estimating the rect_snr
:return:
'''
self.canvas = new_img.copy()
self.trackNo += 1
# get subwindow at current estimated target position, to train classifier
x = self.get_subwindow(new_img, self.pos, self.window_sz,
self.cos_window)
# calculate response of the classifier at all locations
k = self.dense_gauss_kernel(self.sigma, x, self.z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(self.alphaf, kf)
response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
row, col = pylab.unravel_index(response.argmax(), response.shape)
# roi rect's topleft point add [row, col]
self.tly, self.tlx = self.pos - pylab.floor(self.window_sz / 2)
# here the pos is not given to self.pos at once, we need to check the psr first.
# if it above the threashhold(default is 5), self.pos = pos.
pos = np.array([self.tly, self.tlx]) + np.array([row, col])
# Noting, for pos(cy,cx)! for cv2.rect rect(x,y,w,h)!
rect = pylab.array([
pos[1] - self.target_sz[1] / 2, pos[0] - self.target_sz[0] / 2,
self.target_sz[1], self.target_sz[0]
])
rect = rect.astype(np.int)
self.psr, self.trkStatus = self.tracker_status(col, row, response,
rect, new_img)
self.pos = pos
#only update when tracker_status's psr is high
if (self.psr > 10):
#computing new_alphaf and observed x as z
x = self.get_subwindow(new_img, self.pos, self.window_sz,
self.cos_window)
# Kernel Regularized Least-Squares, calculate alphas (in Fourier domain)
k = self.dense_gauss_kernel(self.sigma, x)
new_alphaf = pylab.divide(
self.yf, (pylab.fft2(k) + self.lambda_value)) # Eq. 7
new_z = x
# subsequent frames, interpolate model
f = self.interpolation_factor
self.alphaf = (1 - f) * self.alphaf + f * new_alphaf
self.z = (1 - f) * self.z + f * new_z
ok = 1
return ok, rect, self.psr, response
def plot_upd_mfreqz(self, fig, taps, a=1):
if not signal:
return
self.plot_init_mfreqz(fig)
ax1, ax2 = fig.get_axes()
w, h = signal.freqz(taps, a)
if sum(abs(h)) == 0:
return
h_dB = 20 * pylab.log10(abs(h))
ax1.plot(w / max(w), h_dB)
h_Phase = pylab.unwrap(pylab.arctan2(pylab.imag(h), pylab.real(h)))
ax2.plot(w / max(w), h_Phase)
def _ConvFft(signal, FilterKernel):
"""
Convolution with fft much faster approach
works exactly as convolve(x,y)
"""
ss = numpy.size(signal);
fs = numpy.size(FilterKernel)
# padd zeros all until they have the size N+M-1
signal = numpy.append(signal, numpy.zeros(fs+ss-1-ss));
FilterKernel = numpy.append(FilterKernel, numpy.zeros(fs+ss-1-fs));
signal = pylab.real(pylab.ifft(pylab.fft(signal)*pylab.fft(FilterKernel)));
return signal[:fs+ss-1];
def _ConvFft(signal, filterkernel):
"""
Convolution with fft much faster approach
works exatcly as convolve(x,y)
"""
ss = numpy.size(signal)
fs = numpy.size(filterkernel)
# padd zeros all until they have the size N+M-1
signal = numpy.append(signal, numpy.zeros(fs + ss - 1 - ss))
filterkernel = numpy.append(filterkernel, numpy.zeros(fs + ss - 1 - fs))
signal = pylab.real(pylab.ifft(
pylab.fft(signal) * pylab.fft(filterkernel)))
return signal[:fs + ss - 1]
def _istftm(self,
X_hat=None,
Phi_hat=None,
pvoc=False,
usewin=True,
resamp=None):
"""
::
Inverse short-time Fourier transform magnitude. Make a signal from a |STFT| transform.
Uses phases from self.STFT if Phi_hat is None.
Inputs:
X_hat - N/2+1 magnitude STFT [None=abs(self.STFT)]
Phi_hat - N/2+1 phase STFT [None=exp(1j*angle(self.STFT))]
pvoc - whether to use phase vocoder [False]
usewin - whether to use overlap-add [False]
Returns:
x_hat - estimated signal
"""
if not self._have_stft:
return None
X_hat = self.X if X_hat is None else P.np.abs(X_hat)
if pvoc:
self._pvoc(X_hat, Phi_hat, pvoc)
else:
Phi_hat = P.angle(self.STFT) if Phi_hat is None else Phi_hat
self.X_hat = X_hat * P.exp(1j * Phi_hat)
if usewin:
if self.win is None:
self.win = P.ones(
self.wfft) if self.window == 'rect' else P.np.sqrt(
P.hanning(self.wfft))
if len(self.win) != self.nfft:
self.win = P.r_[self.win, P.np.zeros(self.nfft - self.wfft)]
if len(self.win) != self.nfft:
error.BregmanError(
"features_base.Features._istftm(): assertion failed len(self.win)==self.nfft"
)
else:
self.win = P.ones(self.nfft)
if resamp:
self.win = sig.resample(self.win,
int(P.np.round(self.nfft * resamp)))
fp = self._check_feature_params()
self.x_hat = self._overlap_add(P.real(P.irfft(self.X_hat.T)),
usewin=usewin,
resamp=resamp)
if self.verbosity:
print("Extracted iSTFTM->self.x_hat")
return self.x_hat
def ichebt1(c):
#TODO
"""inverse chebyshev transformation, see chebfun"""
n = len(c)
print("tam===", n)
oncircle = concatenate((c[-1::-1], c[1:-1]));
print("v=", oncircle, n)
v = real(ifft(oncircle));
print(v)
print(v[-2:n:-1])
print("|", v[1:-1])
f = (n-1)*concatenate(([2*v(1)], v[-2:n:-1]+v[1:-1], 2*v[-1]));
print("|", f)
return f
def _icqft(self, V_hat):
"""
::
Inverse constant-Q Fourier transform. Make a signal from a constant-Q transform.
"""
if not self._have_cqft:
return False
fp = self._check_feature_params()
X_hat = pylab.array( pylab.dot(self.Q.T, V_hat) ) * pylab.exp( 1j * pylab.angle(self.STFT) )
self.x_hat = self._overlap_add( pylab.real(fp['nfft'] * pylab.irfft(X_hat.T)) )
if fp['verbosity']:
print "Extracted iCQFT->x_hat"
return True
def ichebt1(c):
#TODO
"""inverse chebyshev transformation, see chebfun"""
n = len(c)
print("tam===", n)
oncircle = concatenate((c[-1::-1], c[1:-1]))
print("v=", oncircle, n)
v = real(ifft(oncircle))
print(v)
print(v[-2:n:-1])
print("|", v[1:-1])
f = (n - 1) * concatenate(([2 * v(1)], v[-2:n:-1] + v[1:-1], 2 * v[-1]))
print("|", f)
return f
def plot_image(in_file,*arguments):
try:
img = spimage.sp_image_read(in_file,0)
except:
print "Error: %s is not a readable .h5 file\n" % in_file
plot_flags = ['abs','mask','phase','real','imag']
shift_flags = ['shift']
log_flags = ['log']
plot_flag = 0
shift_flag = 0
log_flag = 0
for flag in arguments:
flag = flag.lower()
if flag in plot_flags:
plot_flag = flag
elif flag in shift_flags:
shift_flag = flag
elif flag in log_flags:
log_flag = flag
else:
print "unknown flag %s" % flag
if shift_flag:
img = spimage.sp_image_shift(img)
def no_log(x):
return x
if log_flag:
log_function = pylab.log
else:
log_function = no_log
if (plot_flag == "mask"):
pylab.imshow(img.mask,origin='lower',interpolation="nearest")
elif(plot_flag == "phase"):
pylab.imshow(pylab.angle(img.image),cmap='hsv',origin='lower',interpolation="nearest")
elif(plot_flag == "real"):
pylab.imshow(log_function(pylab.real(img.image)),origin='lower',interpolation="nearest")
elif(plot_flag == "imag"):
pylab.imshow(log_function(pylab.imag(img.image)),origin='lower',interpolation="nearest")
else:
pylab.imshow(log_function(abs(img.image)),origin='lower',interpolation="nearest")
pylab.show()
def dense_gauss_kernel(sigma, x, y=None):
"""
Gaussian Kernel with dense sampling.
Evaluates a gaussian kernel with bandwidth SIGMA for all displacements
between input images X and Y, which must both be MxN. They must also
be periodic (ie., pre-processed with a cosine window). The result is
an MxN map of responses.
If X and Y are the same, omit the third parameter to re-use some
values, which is faster.
"""
xf = pylab.fft2(x) # x in Fourier domain
x_flat = x.flatten()
xx = pylab.dot(x_flat.transpose(), x_flat) # squared norm of x
if y is not None:
# general case, x and y are different
yf = pylab.fft2(y)
y_flat = y.flatten()
yy = pylab.dot(y_flat.transpose(), y_flat)
else:
# auto-correlation of x, avoid repeating a few operations
yf = xf
yy = xx
# cross-correlation term in Fourier domain
xyf = pylab.multiply(xf, pylab.conj(yf))
# to spatial domain
xyf_ifft = pylab.ifft2(xyf)
#xy_complex = circshift(xyf_ifft, floor(x.shape/2))
row_shift, col_shift = pylab.floor(pylab.array(x.shape) / 2).astype(int)
xy_complex = pylab.roll(xyf_ifft, row_shift, axis=0)
xy_complex = pylab.roll(xy_complex, col_shift, axis=1)
xy = pylab.real(xy_complex)
# calculate gaussian response for all positions
scaling = -1 / (sigma**2)
xx_yy = xx + yy
xx_yy_2xy = xx_yy - 2 * xy
k = pylab.exp(scaling * pylab.maximum(0, xx_yy_2xy / x.size))
#print("dense_gauss_kernel x.shape ==", x.shape)
#print("dense_gauss_kernel k.shape ==", k.shape)
return k
def dense_gauss_kernel(sigma, x, y=None):
"""
Gaussian Kernel with dense sampling.
Evaluates a gaussian kernel with bandwidth SIGMA for all displacements
between input images X and Y, which must both be MxN. They must also
be periodic (ie., pre-processed with a cosine window). The result is
an MxN map of responses.
If X and Y are the same, ommit the third parameter to re-use some
values, which is faster.
"""
xf = pylab.fft2(x) # x in Fourier domain
x_flat = x.flatten()
xx = pylab.dot(x_flat.transpose(), x_flat) # squared norm of x
if y is not None:
# general case, x and y are different
yf = pylab.fft2(y)
y_flat = y.flatten()
yy = pylab.dot(y_flat.transpose(), y_flat)
else:
# auto-correlation of x, avoid repeating a few operations
yf = xf
yy = xx
# cross-correlation term in Fourier domain
xyf = pylab.multiply(xf, pylab.conj(yf))
# to spatial domain
xyf_ifft = pylab.ifft2(xyf)
#xy_complex = circshift(xyf_ifft, floor(x.shape/2))
row_shift, col_shift = pylab.floor(pylab.array(x.shape)/2).astype(int)
xy_complex = pylab.roll(xyf_ifft, row_shift, axis=0)
xy_complex = pylab.roll(xy_complex, col_shift, axis=1)
xy = pylab.real(xy_complex)
# calculate gaussian response for all positions
scaling = -1 / (sigma**2)
xx_yy = xx + yy
xx_yy_2xy = xx_yy - 2 * xy
k = pylab.exp(scaling * pylab.maximum(0, xx_yy_2xy / x.size))
#print("dense_gauss_kernel x.shape ==", x.shape)
#print("dense_gauss_kernel k.shape ==", k.shape)
return k
def _istftm(self, X_hat, Phi_hat=None):
"""
::
Inverse short-time Fourier transform magnitude. Make a signal from a |STFT| transform.
Uses phases from self.STFT if Phi_hat is None.
"""
if not self._have_stft:
return False
if Phi_hat is None:
Phi_hat = pylab.exp( 1j * pylab.angle(self.STFT))
fp = self._check_feature_params()
X_hat = X_hat * Phi_hat
self.x_hat = self._overlap_add( pylab.real(fp['nfft'] * pylab.irfft(X_hat.T)) )
if fp['verbosity']:
print "Extracted iSTFTM->self.x_hat"
return True
def dense_gauss_kernel(sigma, x, y=None):
"""
通过高斯核计算余弦子窗口图像块的响应图
利用带宽是 sigma 的高斯核估计两个图像块 X (MxN) 和 Y (MxN) 的关系。X, Y 是循环的、经余弦窗处理的。输出结果是
响应图矩阵 MxN. 如果 X = Y, 则函数调用时取消 y，则加快计算。
该函数对应原文中的公式 (16)，以及算法1中的 function k = dgk(x1, x2, sigma)
:param sigma: 高斯核带宽
:param x: 余弦子窗口图像块
:param y: 空或者模板图像块
:return: 响应图
"""
# 计算图像块 x 的傅里叶变换
xf = pylab.fft2(x) # x in Fourier domain
# 把图像块 x 拉平
x_flat = x.flatten()
# 计算 x 的2范数平方
xx = pylab.dot(x_flat.transpose(), x_flat) # squared norm of x
if y is not None:
# 一半情况， x 和 y 是不同的，计算 y 的傅里叶变化和2范数平方
yf = pylab.fft2(y)
y_flat = y.flatten()
yy = pylab.dot(y_flat.transpose(), y_flat)
else:
# x 的自相关，避免重复计算
yf = xf
yy = xx
# 傅里叶域的互相关计算，逐元素相乘
xyf = pylab.multiply(xf, pylab.conj(yf))
# 转化为频率域
xyf_ifft = pylab.ifft2(xyf)
# 对频率域里的矩阵块进行滚动平移，分别沿 row 和 col 轴
row_shift, col_shift = pylab.floor(pylab.array(x.shape) / 2).astype(int)
xy_complex = pylab.roll(xyf_ifft, row_shift, axis=0)
xy_complex = pylab.roll(xy_complex, col_shift, axis=1)
xy = pylab.real(xy_complex)
# 计算高斯核响应图
scaling = -1 / (sigma**2)
xx_yy = xx + yy
xx_yy_2xy = xx_yy - 2 * xy
return pylab.exp(scaling * pylab.maximum(0, xx_yy_2xy / x.size))
def _istftm(self, X_hat=None, Phi_hat=None, pvoc=False, usewin=True, resamp=None):
"""
::
Inverse short-time Fourier transform magnitude. Make a signal from a |STFT| transform.
Uses phases from self.STFT if Phi_hat is None.
Inputs:
X_hat - N/2+1 magnitude STFT [None=abs(self.STFT)]
Phi_hat - N/2+1 phase STFT [None=exp(1j*angle(self.STFT))]
pvoc - whether to use phase vocoder [False]
usewin - whether to use overlap-add [False]
Returns:
x_hat - estimated signal
"""
if not self._have_stft:
return None
X_hat = self.X if X_hat is None else P.np.abs(X_hat)
if pvoc:
self._pvoc(X_hat, Phi_hat, pvoc)
else:
Phi_hat = P.angle(self.STFT) if Phi_hat is None else Phi_hat
self.X_hat = X_hat * P.exp(1j * Phi_hat)
if usewin:
if self.win is None:
self.win = P.ones(self.wfft) if self.window == 'rect' else P.np.sqrt(
P.hanning(self.wfft))
if len(self.win) != self.nfft:
self.win = P.r_[self.win, P.np.zeros(self.nfft - self.wfft)]
if len(self.win) != self.nfft:
error.BregmanError(
"features_base.Features._istftm(): assertion failed len(self.win)==self.nfft")
else:
self.win = P.ones(self.nfft)
if resamp:
self.win = sig.resample(
self.win, int(P.np.round(self.nfft * resamp)))
fp = self._check_feature_params()
self.x_hat = self._overlap_add(
P.real(P.irfft(self.X_hat.T)), usewin=usewin, resamp=resamp)
if self.verbosity:
print("Extracted iSTFTM->self.x_hat")
return self.x_hat
def getGrowthNakata(ky_list, Setup, init = -0.07 -.015j):
results = []
eta_e = Setup['eta_e']
kx = Setup['kx']
v_te = Setup['v_te']
rho_te2 = Setup['rho_te2']
tau = Setup['tau']
theta = Setup['theta']
for ky in ky_list:
kp = mp.sqrt(2.) * theta * ky
# Dispersion Relation Equation (9)
if ky > 2.5 : init = 0.01 - 0.01j
def DispersionRelation(w):
ko2 = kx**2 + ky**2
def Lambda(b): return mp.exp(b) * (1. + tau - Gamma0(b))
#def Lambda(b): return mp.exp(b) * (tau + b/(1.+b))
#zeta = w / (kp * v_te)
zeta = w / (kp * v_te)
w_star_e = ky * pylab.sqrt(rho_te2) * v_te
# Take care of extra pie due to normalization
#return 1. + Lambda(ko2 * rho_te2) + zeta * Z(zeta) - ky/kp * eta_e * zeta - ky/kp * ( eta_e * zeta**2 +\
return 1. + Lambda(ko2 * rho_te2) + zeta * Z(zeta) - ky/kp * eta_e * zeta - ky/kp * ( eta_e * zeta**2 +\
(1. - eta_e/2. * (1. + ko2 * rho_te2)))*Z(zeta) * mp.sqrt(mp.pi)
#(1. - eta_e/2. * (1. + ko2 * rho_te2)))*Z(zeta)
try:
omega = complex(mp.findroot(DispersionRelation, init, solver='muller', maxsteps=1000))
#omega = complex(PT.zermuller(DispersionRelation, 0., -0.2 - 0.05j, dx=.001)[0])
except:
omega = .0
print "Not found : ", ky, " Theta : ", theta
results.append(float(pylab.real(omega)) + 1.j * pylab.imag(omega))
return (pylab.array(ky_list), pylab.array(results))
def numform(element,tol):
"""numform returns a string representing num -- the string is blank if |num|<tol"""
st=""
reelement=real(element)
imelement=imag(element)
if abs(reelement)<tol: # don't print the real part
if abs(imelement)>tol: # print the imag part
st+=inumform(imelement)
st+="i"
elif abs(imag(element))<tol: # print real but not imag
st+=rnumform(reelement)
else: # print both
st+=rnumform(reelement)
if imelement>0:
st+="+"
else:
st+="-"
imelement=-imelement
st+=inumform(imelement)
st+="i"
return st
def find(self, image):
if self.should_resize_image:
self.image = scipy.misc.imresize(image, 0.5)
self.image = self.image / 255.0 # hack around scipy
else:
self.image = image
# get subwindow at current estimated target position,
# to train classifer
x = get_subwindow(self.image, self.pos, self.sz, self.cos_window)
# calculate response of the classifier at all locations
k = dense_gauss_kernel(self.sigma, x, self.z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(self.alphaf, kf)
self.response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
r = self.response
self.row, self.col = pylab.unravel_index(r.argmax(), r.shape)
self.pos = self.pos - pylab.floor(self.sz / 2) + [self.row, self.col]
return self.pos
def find(self, image):
if len(image.shape) == 3 and image.shape[2] > 1:
image = rgb2gray(image)
self.image = image
if self.should_resize_image:
self.image = scipy.misc.imresize(self.image, 0.5)
self.image = self.image / 255.0
# get subwindow at current estimated target position,
# to train classifer
x = get_subwindow(self.image, self.pos, self.sz, self.cos_window)
# calculate response of the classifier at all locations
k = dense_gauss_kernel(self.sigma, x, self.z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(self.alphaf, kf)
self.response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
r = self.response
self.row, self.col = pylab.unravel_index(r.argmax(), r.shape)
self.pos = self.pos - pylab.floor(self.sz/2) + [self.row, self.col]
return self.pos
total_bits=50
samples_per_cycle=float(sampling_rate)/float(local_osc)
samples_per_bit=cycles_per_bit*samples_per_cycle
len_iq_samples=int(float(total_bits)*samples_per_bit)
total_samples_to_read=len_iq_samples*2
fileh=open(sys.argv[1],'rb')
samples=bytearray(fileh.read(total_samples_to_read))
print len(samples)
iq_samples=pl.array([complex(samples[i*2]-128, samples[i*2+1]-128) for i in range(0,len_iq_samples) ])
dc_component=pl.sum(iq_samples)/len_iq_samples
for i in range(-5,5):
lo=pl.exp(-1j*pl.frange(0,len_iq_samples-1)*(local_osc+i*1000)*2*pl.pi/sampling_rate)
#pl.plot(iq_samples)
down_convert=iq_samples*lo
decimated_samples=[pl.sum(down_convert[i:i+samples_per_bit-1]) for i in range(0,len_iq_samples-int(samples_per_bit))]
x_axis_range=pl.frange(len(decimated_samples)-1)/samples_per_bit
print len(x_axis_range), len(decimated_samples)
pl.subplot(211)
pl.plot(x_axis_range,pl.real(decimated_samples),'b',
x_axis_range,pl.imag(decimated_samples),'r')
pl.title('IQ Samples')
pl.subplot(212)
pl.plot(x_axis_range,pl.arctan(pl.imag(decimated_samples)/pl.real(decimated_samples)))
pl.title('Phase')
pl.figure(2)
f_range=pl.frange(-sampling_rate/2 , sampling_rate/2 ,(sampling_rate)/len_iq_samples)
print len(f_range), len_iq_samples
pl.plot(f_range[0:len_iq_samples],abs(pl.fft(iq_samples)))
pl.plot('FFT of IQ Samples')
pl.show()
def getGrowth(ky_list, Setup, disp="Gyro", init = -0.02 -.006j):
mp.dps=15
results = []
residuum = []
eta = Setup['eta']
kx = Setup['kx']
v_te = Setup['v_te']
rho_te2 = Setup['rho_te2']
tau = Setup['tau']
theta = Setup['theta']
m_ie = Setup['m_ie']
lambda_D2 = Setup['lambda_D2']
for ky in ky_list:
kp = theta * ky * v_te
ko2 = kx**2 + ky**2
kyp = ky/kp
b = ko2 * rho_te2
G0 = Gamma0(b)
G0mG1 = Gamma0(b) - Gamma1(b)
if disp == 'Gyro1st':
def DispersionRelation(w):
Lambda = lambda_D2 * b + mp.exp(b) * (1. + 1. - G0)
zeta = w / kp
Z = Z_PDF(zeta)
# Take care of extra pie due to normalization
return - (1. - eta/2. * (1. + b))*kyp * Z \
- eta * kyp * (zeta + zeta**2 * Z) + zeta * Z + 1. + Lambda
if disp == 'Gyro1stKin':
def DispersionRelation(w):
def Disp(w, kp, b, eta):
zeta = w / kp
Z = Z_PDF(zeta)
kyp = ky/kp
return - (1. - eta/2. * (1. + b))*kyp * Z \
- eta * kyp * (zeta + zeta**2 * Z) + zeta * Z + 1.
# proton
sum1MG0 = lambda_D2 * b + (1. - G0) + (1. - G0/m_ie)
#return -mp.exp(-b) * Disp(w, kp, b, eta) + mp.exp(-b/m_ie) * Disp(w,kp * mp.sqrt(m_ie), b/m_ie, eta*mp.sqrt(m_ie)) + sum1MG0
return mp.exp(-b) * Disp(w, kp, b, eta) - mp.exp(-b/m_ie) * Disp(w,kp * mp.sqrt(m_ie), b/m_ie, eta) + sum1MG0
elif disp == 'Fluid':
def DispersionRelation(w):
K = 1. + eta
K_12 = 1. + eta/2.
Lambda = 0.#lambda_D2 * b + mp.exp(b) * (1. + 1. - G0)
return -ko2 + ( (ky + w)/(K_12 * ky - w) + kp**2 /w**2 * (0.5 * (K * ky - w)) /(K_12 * ky - w)) + Lambda
return -ko2 + ( (ky+w)/(K_12 * ky-w) + kp**2 /w**2 * (0.5 * (K * ky - w)) /(K_12 * ky-w))
elif disp == 'Gyro':
def DispersionRelation(w):
Lambda = lambda_D2 *b + (1. - G0) + 1.
zeta = w / kp
Z = Z_PDF(zeta)
# Take care of extra pie due to normalization
return - (1. - eta/2.)*kyp * G0 * Z + eta * kyp * b * G0mG1 * Z \
- eta * kyp * G0 * ( zeta + zeta**2 * Z) + zeta * Z * G0 + G0 + Lambda
elif disp == 'GyroKin':
def DispersionRelation(w):
# Take care of extra pie due to normalization
# what is Debye lengtth effect here ?
def Disp(w, kp, b, eta):
zeta = w / kp
Z = Z_PDF(zeta)
kyp = ky/kp
G0 = Gamma0(b)
G0mG1 = Gamma0(b) - Gamma1(b)
return - (1. - eta/2.)*kyp * G0 * Z + eta * kyp * b * G0mG1 * Z \
- eta * kyp * G0 * ( zeta + zeta**2 * Z) + zeta * Z * G0 + G0
sum1MG0 = (1. - G0) + (1. - Gamma0(b/m_ie))
return Disp(w, kp, b, eta) - Disp(w,kp * mp.sqrt(m_ie), b/m_ie, eta/mp.sqrt(m_ie) ) + sum1MG0
return Disp(w, kp, b, eta) + (1.-G0) + 1. # - Disp(w,kp * mp.sqrt(m_ie), b/m_ie, eta ) + sum1MG0
return Disp(w, kp, b, eta) - Disp(w,kp * mp.sqrt(m_ie), b/m_ie, eta/mp.sqrt(m_ie)) + sum1MG0
else : print "No such Dispersion Relation : ", disp
omega = init
def checkAndImprove(omega, solver, tol=1.e-9):
omega2 = omega
try : omega2 = complex(mp.findroot(DispersionRelation, omega , solver=solver, maxsteps=100, tol=tol))
except : pass
if (abs(DispersionRelation(omega2)) < abs(DisperisonRelation(omega))) : return omega2
else : return omega
#omega = checkAndImprove(omega, "newton", 1.e-6)
try:
if (ky < 0.3): omega = complex(mp.findroot(DispersionRelation, omega, solver='anewton', maxsteps=10, verify=False))
omega = complex(mp.findroot(DispersionRelation, omega, solver='halley', maxsteps=300))
#omega = complex(mp.findroot(DispersionRelation, omega, solver='newton', maxsteps=100 ))
except :
omega = float('nan')
print "ky : ", ky , " w : ", omega
results.append(float(pylab.real(omega)) + 1.j * pylab.imag(omega))
res = DispersionRelation(results[-1])
residuum.append(min(1.,float(abs(res))))
return (pylab.array(ky_list), pylab.array(results), pylab.array(residuum))
m = MicGeom()
m.mpos_tot = array([[0, 0, 0]])
t = PointSource(signal=n1, mpos=m, loc=(1, 0, 1))
f = PowerSpectra(time_data=t,
window='Hanning',
overlap='50%',
block_size=4096)
###################################################################
### Plotting ###
from pylab import figure, plot, show, xlim, ylim, xscale, xticks, xlabel, ylabel, grid, real
from acoular import L_p
band = 3 # octave: 1 ; 1/3-octave: 3
(f_borders, p, f_center) = barspectrum(real(f.csm[:, 0, 0]), f.fftfreq(),
band)
label_freqs = [str(int(_)) for _ in f_center]
figure(figsize=(20, 6))
plot(f_borders, L_p(p))
xlim(f_borders[0] * 2**(-1. / 6), f_borders[-1] * 2**(1. / 6))
ylim(40, 90)
xscale('symlog')
xticks(f_center, label_freqs)
xlabel('f in Hz')
ylabel('SPL in dB')
band = 3 # octave: 1 ; 1/3-octave: 3 (for plotting)
# set up microphone at (0,0,0)
m = MicGeom()
m.mpos_tot = array([[0, 0, 0]])
# create noise source
n1 = WNoiseGenerator(sample_freq=sfreq, numsamples=10 * sfreq, seed=1)
t = PointSource(signal=n1, mics=m, loc=(1, 0, 1))
# create power spectrum
f = PowerSpectra(time_data=t, window='Hanning', overlap='50%', block_size=4096)
# get spectrum data
spectrum_data = real(f.csm[:, 0,
0]) # get power spectrum from cross-spectral matrix
freqs = f.fftfreq() # FFT frequencies
# use barspectrum from acoular.tools to create third octave plot data
(f_borders, p, f_center) = barspectrum(spectrum_data, freqs, band, bar=True)
(f_borders_, p_, f_center_) = barspectrum(spectrum_data,
freqs,
band,
bar=False)
# create figure with barspectra
figure(figsize=(20, 6))
title("Powerspectrum")
plot(f_borders, L_p(p), label="bar=True")
plot(f_borders_, L_p(p_), label="bar=False")
xlim(f_borders[0] * 2**(-1. / 6), f_borders[-1] * 2**(1. / 6))
from PDE_FIND import *
import scipy.io as sio
import pylab
import random
def wgn(x, snr):
snr = 10**(snr/10.0)
xpower = np.sum(x**2)/len(x)
npower = xpower / snr
return np.random.randn(len(x)) * np.sqrt(npower)
pylab.rcParams['figure.figsize'] = (12, 8)
# Load data
data = sio.loadmat('C:/Users/15307/Desktop/热传导方程解集构建/initialdata.mat')
u1 = np.transpose(pylab.real(data['Ex_plasma']))
u2 = np.transpose(pylab.real(data['Hy_plasma']))
jx = np.transpose(pylab.real(data['Jx_plasma']))
#jy = pylab.real(data['Jy_plasma'])
#jz = pylab.real(data['Jz_plasma'])
x = data['x'][0]
t = data['t'][0]
for i in range(800):
a1 = u1[i]
a2 = u2[i]
a3 = jx[i]
n1 = wgn(a1,snr)
n2 = wgn(a2,snr)
n3 = wgn(a3,snr)
u1[i] = a1 + n1
#!/usr/bin/python
import spimage
import pylab
# Read input image
img = spimage.sp_image_read('../ring/raw_ring.h5',0)
# Convolute with a 2 pixel
# standard deviation gaussian
img_blur = spimage.sp_gaussian_blur(img,2.0)
rel_diff = abs((pylab.real(img_blur.image)-
pylab.real(img.image))
/pylab.real(img_blur.image))
# Plot relative difference
pylab.imshow(rel_diff,vmin = 0,vmax = 0.5)
pylab.colorbar()
pylab.show()
def calculateinitsunc(self,H,l,sigma_L = 1e-6,sigma_Theta = 1,n_exact = 1,filename=None):
# Calculates the uncertianty on n and k according to:
# W. Withayachumnankul, B. M. Fisher, H. Lin, D. Abbott, "Uncertainty in terahertz time-domain spectroscopy measurement", J. Opt. Soc. Am. B., Vol. 25, No. 6, June 2008, pp. 1059-1072
#
# sigma_L = standard uncertainty on sample thickness in meter
# sigma_Theta = interval of sample misallignment in degree
# n_exact = exact value of the refractive index of air during the measurements
n, k = self.calculateinits(H,l)
n = py.asarray(n)
k = py.asarray(k)
Asam = []
Aref = []
Bsam = []
Bref = []
for i in range(len(self.H.getfreqs())):
Asam.append((py.sum(py.imag(self.H.fdsam.getFAbs().tolist()[i]*py.exp(1j*2*py.pi*self.H.getfreqs().tolist()[i]*self.H.fdsam._tdData.getTimes()))*self.H.fdsam._tdData.getUncEX())**2))
Aref.append((py.sum(py.imag(self.H.fdref.getFAbs().tolist()[i]*py.exp(1j*2*py.pi*self.H.getfreqs().tolist()[i]*self.H.fdref._tdData.getTimes()))*self.H.fdref._tdData.getUncEX())**2))
Bsam.append((py.sum(py.real(self.H.fdsam.getFAbs().tolist()[i]*py.exp(1j*2*py.pi*self.H.getfreqs().tolist()[i]*self.H.fdsam._tdData.getTimes()))*self.H.fdsam._tdData.getUncEX())**2))
Bref.append((py.sum(py.real(self.H.fdref.getFAbs().tolist()[i]*py.exp(1j*2*py.pi*self.H.getfreqs().tolist()[i]*self.H.fdref._tdData.getTimes()))*self.H.fdref._tdData.getUncEX())**2))
# Uncertainty on n
sn_Esam_2 = ((c/(2*py.pi*self.H.getfreqs()*l))**2 * py.asarray(Asam)/self.H.fdsam.getFAbs()**4)/self.H.fdsam._tdData.numberOfDataSets
sn_Eref_2 = ((c/(2*py.pi*self.H.getfreqs()*l))**2 * py.asarray(Aref)/self.H.fdref.getFAbs()**4)/self.H.fdref._tdData.numberOfDataSets
sn_l_2 = ((n-self.n_0)*sigma_L/l)**2
#sn_l_2_1 = (c*self.H.getFPh()/(2*py.pi*self.H.getfreqs()*l*l))**2 * sigma_L**2
#sn_H_2 = (c/(2*py.pi*self.H.getfreqs()*l))**2 * self.H.getFPhUnc()**2
fn_Theta = (n-self.n_0.real)*(1/py.cos(sigma_Theta*py.pi/180)-1)
fn_H = (c/(2*py.pi*self.H.getfreqs()*l))*py.absolute(-py.angle(4*(n-1j*k)*self.n_0/(n-1j*k+self.n_0)**2))
fn_FP = (c/(2*py.pi*self.H.getfreqs()*l))*py.absolute(-py.angle(1/(1-((n-1j*k-self.n_0)/(n-1j*k+self.n_0))**2*py.exp(-2*1j*(n-1j*k)*2*py.pi*self.H.getfreqs()*l/c))))
fn_n0 = abs(self.n_0.real - n_exact)*py.ones(len(self.H.getFPh()))
u_n = py.sqrt(sn_l_2+sn_Esam_2+sn_Eref_2)+fn_Theta+fn_H+fn_FP+fn_n0
# Uncertianty on k
sk_Esam_2 = ((c/(2*py.pi*self.H.getfreqs()*l))**2 *(Bsam/self.H.fdsam.getFAbs()**4 + ((n-self.n_0)/(n+self.n_0))**2 * sn_Esam_2/n**2))/self.H.fdsam._tdData.numberOfDataSets
sk_Eref_2 = ((c/(2*py.pi*self.H.getfreqs()*l))**2 *(Bref/self.H.fdref.getFAbs()**4 + ((n-self.n_0)/(n+self.n_0))**2 * sn_Eref_2/n**2))/self.H.fdref._tdData.numberOfDataSets
sk_l_2 = (k*sigma_L/l)**2 + (c*(n-self.n_0)/((n+self.n_0)*n*2*py.pi*self.H.getfreqs()*l))**2*sn_l_2
#sk_l_2_1 = ((c/(2*py.pi*self.H.getfreqs()*l*l))*py.log(self.H.getFAbs()*(n+self.n_0.real)**2/(4*n*self.n_0.real)))**2 * sigma_L**2
#sk_H_2 = (-c/(2*py.pi*self.H.getfreqs()*l*self.H.getFAbs()))**2 * self.H.getFAbsUnc()**2
fk_Theta = k*(1/py.cos(sigma_Theta*py.pi/180)-1)+c*(n-self.n_0.real)*fn_Theta/(n*2*py.pi*self.H.getfreqs()*l*(n+self.n_0.real))
fk_H = (c/(2*py.pi*self.H.getfreqs()*l))*(py.log(py.absolute(n/(n-1j*k)*((n-1j*k+self.n_0.real)/(n+self.n_0.real))**2))+py.absolute(fn_H)*(n-self.n_0.real)/(n*(n+self.n_0.real)))
fk_FP = (c/(2*py.pi*self.H.getfreqs()*l))*(py.absolute(-py.log(py.absolute(1/(1-((n-1j*k-self.n_0)/(n-1j*k+self.n_0))**2*py.exp(-2*1j*(n-1j*k)*2*py.pi*self.H.getfreqs()*l/c)))))+py.absolute(fn_FP)*(n-self.n_0.real)/(n*(n+self.n_0.real)))
fk_n0 = (c/(2*py.pi*self.H.getfreqs()*l))*(n-self.n_0.real)*(self.n_0.real - n_exact)/(n*self.n_0.real)
u_k = py.sqrt(sk_l_2+sk_Esam_2+sk_Eref_2)+fk_Theta+fk_H+fk_FP+fk_n0
# Convert n in epsilon Epsilon = Epsilon_1 + j Epsilon_2 = (n+jk)**2
# Epsilon_1 = n**2 - k**2
# Epsilon_2 = -2nk
Epsilon_1 = n**2 - k **2
Epsilon_2 = -2 * n * k
u_Epsilon_1 = py.sqrt((2*n*u_n)**2 + (-2*k*u_k)**2)
u_Epsilon_2 = py.sqrt((-2*k*u_n)**2 + (-2*n*u_k)**2)
# Calculate absorption coefficient
# alpha = 4 * pi * k * f / c1
alpha = 4 * py.pi * k * self.H.getfreqs() / (100 * c) # in cm^-1
u_alpha = 4 * py.pi * u_k * self.H.getfreqs() / (100 * c) # in cm^-1
# Calculate maximum measurable absorption coefficient according to
# P. U. Jepsen and B. M. Fisher: "Dynamic Range in terahertz time-domain transmission and reflection spectroscopy", Optics Letters, Vol. 30, n. 1, pp. 29-31, Jan 2005
alpha_max = 2 * py.log((self.H.fdsam.getDR() * 4 * n)/(n + 1)**2) / (100 * l) # in cm^-1
# Save results into a table accessible from outside
self.n_with_unc=py.real(py.column_stack((
self.H.getfreqs(), # frequencies
n, k, # real and imaginary part of n
u_n, u_k, # k=1 combined uncertainty on n and k
py.sqrt(sn_l_2), py.sqrt(sn_Esam_2), py.sqrt(sn_Eref_2), fn_Theta, fn_H, fn_FP, fn_n0, # Uncertainty components of n due to thickness, H, sample misallignment, k<<<, Neglect FP, ref ind of air
py.sqrt(sk_l_2), py.sqrt(sk_Esam_2), py.sqrt(sk_Eref_2), fk_Theta, fk_H, fk_FP, fk_n0, # Uncertainty components of k due to thickness, H, sample misallignment, k<<<, Neglect FP, ref ind of air
Epsilon_1, Epsilon_2, # Real and imaginary part of Epsilon
u_Epsilon_1, u_Epsilon_2, # k = 1 uncertainty on the real and imaginary part of Epsilon
alpha, u_alpha, # Absorption coefficient and its k = 1 uncertainty
alpha_max, # Maximum measurable absorption coefficient
)))
return
def track(input_video_path):
"""
notation: variables ending with f are in the frequency domain.
"""
# parameters according to the paper --
padding = 1.0 # extra area surrounding the target
# spatial bandwidth (proportional to target)
output_sigma_factor = 1 / float(16)
sigma = 0.2 # gaussian kernel bandwidth
lambda_value = 1e-2 # regularization
# linear interpolation factor for adaptation
interpolation_factor = 0.075
info = load_video_info(input_video_path)
img_files, pos, target_sz, \
should_resize_image, ground_truth, video_path = info
# window size, taking padding into account
sz = pylab.floor(target_sz * (1 + padding))
# desired output (gaussian shaped), bandwidth proportional to target size
output_sigma = pylab.sqrt(pylab.prod(target_sz)) * output_sigma_factor
grid_y = pylab.arange(sz[0]) - pylab.floor(sz[0] / 2)
grid_x = pylab.arange(sz[1]) - pylab.floor(sz[1] / 2)
# [rs, cs] = ndgrid(grid_x, grid_y)
rs, cs = pylab.meshgrid(grid_x, grid_y)
y = pylab.exp(-0.5 / output_sigma**2 * (rs**2 + cs**2))
yf = pylab.fft2(y)
# print("yf.shape ==", yf.shape)
# print("y.shape ==", y.shape)
# store pre-computed cosine window
cos_window = pylab.outer(pylab.hanning(sz[0]), pylab.hanning(sz[1]))
total_time = 0 # to calculate FPS
positions = pylab.zeros((len(img_files), 2)) # to calculate precision
global z, response
z = None
alphaf = None
response = None
for frame, image_filename in enumerate(img_files):
if True and ((frame % 10) == 0):
print("Processing frame", frame)
# load image
image_path = os.path.join(video_path, image_filename)
im = pylab.imread(image_path)
if len(im.shape) == 3 and im.shape[2] > 1:
im = rgb2gray(im)
# print("Image max/min value==", im.max(), "/", im.min())
if should_resize_image:
im = scipy.misc.imresize(im, 0.5)
start_time = time.time()
# extract and pre-process subwindow
x = get_subwindow(im, pos, sz, cos_window)
is_first_frame = (frame == 0)
if not is_first_frame:
# calculate response of the classifier at all locations
k = dense_gauss_kernel(sigma, x, z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(alphaf, kf)
response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
r = response
row, col = pylab.unravel_index(r.argmax(), r.shape)
pos = pos - pylab.floor(sz / 2) + [row, col]
if debug:
print("Frame ==", frame)
print("Max response", r.max(), "at", [row, col])
pylab.figure()
pylab.imshow(cos_window)
pylab.title("cos_window")
pylab.figure()
pylab.imshow(x)
pylab.title("x")
pylab.figure()
pylab.imshow(response)
pylab.title("response")
pylab.show(block=True)
# end "if not first frame"
# get subwindow at current estimated target position,
# to train classifer
x = get_subwindow(im, pos, sz, cos_window)
# Kernel Regularized Least-Squares,
# calculate alphas (in Fourier domain)
k = dense_gauss_kernel(sigma, x)
new_alphaf = pylab.divide(yf, (pylab.fft2(k) + lambda_value)) # Eq. 7
new_z = x
if is_first_frame:
# first frame, train with a single image
alphaf = new_alphaf
z = x
else:
# subsequent frames, interpolate model
f = interpolation_factor
alphaf = (1 - f) * alphaf + f * new_alphaf
z = (1 - f) * z + f * new_z
# end "first frame or not"
# save position and calculate FPS
positions[frame, :] = pos
total_time += time.time() - start_time
# visualization
plot_tracking(frame, pos, target_sz, im, ground_truth)
# end of "for each image in video"
if should_resize_image:
positions = positions * 2
print("Frames-per-second:", len(img_files) / total_time)
title = os.path.basename(os.path.normpath(input_video_path))
if len(ground_truth) > 0:
# show the precisions plot
show_precision(positions, ground_truth, video_path, title)
return
def autoCorr(self, timeSeries): self.N = len(timeSeries) self.nfft = int(2 ** math.ceil(math.log(abs(self.N),2))) self.ACF = p.ifft(p.fft(timeSeries,self.nfft) * p.conjugate(p.fft(timeSeries,self.nfft))) self.ACF = list(p.real(self.ACF[:int(math.ceil((self.nfft+1)/2.0))])) self.plotAutoCorr()
plot_flag = flag
elif flag in log_flags:
log_flag = flag
else:
print "unknown flag %s" % flag
if log_flag == 'log':
log_function = pylab.log
else:
log_function = no_log
if plot_flag == 'phases':
hist = pylab.histogram(pylab.angle(values),bins=50)
ax.plot((hist[1][:-1]+hist[1][1:])/2.0,log_function(hist[0]))
elif plot_flag == 'histogram':
hist = pylab.histogram2d(pylab.real(values),pylab.imag(values),bins=500)
ax.imshow(log_function(hist[0]),extent=(hist[2][0],hist[2][-1],-hist[1][-1],-hist[1][0]),interpolation='nearest')
else:
ax.plot(pylab.real(values),pylab.imag(values),'.')
return fig
if __name__ == "__main__":
try:
plot_phases(sys.argv[1],*sys.argv[2:])
pylab.show()
except:
print """
Usage: plot_phases datafile [flags]
def track(input_video_path):
"""
notation: variables ending with f are in the frequency domain.
"""
# parameters according to the paper --
padding = 1.0 # extra area surrounding the target
#spatial bandwidth (proportional to target)
output_sigma_factor = 1 / float(16)
sigma = 0.2 # gaussian kernel bandwidth
lambda_value = 1e-2 # regularization
# linear interpolation factor for adaptation
interpolation_factor = 0.075
info = load_video_info(input_video_path)
img_files, pos, target_sz, \
should_resize_image, ground_truth, video_path = info
# window size, taking padding into account
sz = pylab.floor(target_sz * (1 + padding))
# desired output (gaussian shaped), bandwidth proportional to target size
output_sigma = pylab.sqrt(pylab.prod(target_sz)) * output_sigma_factor
grid_y = pylab.arange(sz[0]) - pylab.floor(sz[0]/2)
grid_x = pylab.arange(sz[1]) - pylab.floor(sz[1]/2)
#[rs, cs] = ndgrid(grid_x, grid_y)
rs, cs = pylab.meshgrid(grid_x, grid_y)
y = pylab.exp(-0.5 / output_sigma**2 * (rs**2 + cs**2))
yf = pylab.fft2(y)
#print("yf.shape ==", yf.shape)
#print("y.shape ==", y.shape)
# store pre-computed cosine window
cos_window = pylab.outer(pylab.hanning(sz[0]),
pylab.hanning(sz[1]))
total_time = 0 # to calculate FPS
positions = pylab.zeros((len(img_files), 2)) # to calculate precision
global z, response
z = None
alphaf = None
response = None
for frame, image_filename in enumerate(img_files):
if True and ((frame % 10) == 0):
print("Processing frame", frame)
# load image
image_path = os.path.join(video_path, image_filename)
im = pylab.imread(image_path)
if len(im.shape) == 3 and im.shape[2] > 1:
im = rgb2gray(im)
#print("Image max/min value==", im.max(), "/", im.min())
if should_resize_image:
im = scipy.misc.imresize(im, 0.5)
start_time = time.time()
# extract and pre-process subwindow
x = get_subwindow(im, pos, sz, cos_window)
if debug:
pylab.figure()
pylab.imshow(x)
pylab.title("sub window")
is_first_frame = (frame == 0)
if not is_first_frame:
# calculate response of the classifier at all locations
k = dense_gauss_kernel(sigma, x, z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(alphaf, kf)
response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
r = response
row, col = pylab.unravel_index(r.argmax(), r.shape)
pos = pos - pylab.floor(sz/2) + [row, col]
if debug:
print("Frame ==", frame)
print("Max response", r.max(), "at", [row, col])
pylab.figure()
pylab.imshow(cos_window)
pylab.title("cos_window")
pylab.figure()
pylab.imshow(x)
pylab.title("x")
pylab.figure()
pylab.imshow(response)
pylab.title("response")
pylab.show(block=True)
# end "if not first frame"
# get subwindow at current estimated target position,
# to train classifer
x = get_subwindow(im, pos, sz, cos_window)
# Kernel Regularized Least-Squares,
# calculate alphas (in Fourier domain)
k = dense_gauss_kernel(sigma, x)
new_alphaf = pylab.divide(yf, (pylab.fft2(k) + lambda_value)) # Eq. 7
new_z = x
if is_first_frame:
#first frame, train with a single image
alphaf = new_alphaf
z = x
else:
# subsequent frames, interpolate model
f = interpolation_factor
alphaf = (1 - f) * alphaf + f * new_alphaf
z = (1 - f) * z + f * new_z
# end "first frame or not"
# save position and calculate FPS
positions[frame, :] = pos
total_time += time.time() - start_time
# visualization
plot_tracking(frame, pos, target_sz, im, ground_truth)
# end of "for each image in video"
if should_resize_image:
positions = positions * 2
print("Frames-per-second:", len(img_files) / total_time)
title = os.path.basename(os.path.normpath(input_video_path))
if len(ground_truth) > 0:
# show the precisions plot
show_precision(positions, ground_truth, video_path, title)
return
#!/usr/bin/python
import spimage
import pylab
# Read input image
img = spimage.sp_image_read('../ring/raw_ring.h5', 0)
# Convolute with a 2 pixel
# standard deviation gaussian
img_blur = spimage.sp_gaussian_blur(img, 2.0)
rel_diff = abs((pylab.real(img_blur.image) - pylab.real(img.image)) /
pylab.real(img_blur.image))
# Plot relative difference
pylab.imshow(rel_diff, vmin=0, vmax=0.5)
pylab.colorbar()
pylab.show()
def track(input_video_path, show_tracking):
"""
注意：以 f 结尾的变量表示频率域
"""
# 目标周围的额外区域
padding = 1.0
# 空间带宽，与目标成比例
output_sigma_factor = 1 / float(16)
# 高斯核带宽
sigma = 0.2
# 正则化系数
lambda_value = 1e-2
# 线性插值因子
interpolation_factor = 0.075
# 加载视频信息，包括待测试的每帧图片列表，首帧目标矩形框中心点坐标[y,x]，矩形框高、宽一半的大小，是否进行图片缩放一半
# 每帧图片的 ground truth 信息，视频路径
info = load_video_info.load_video_info(input_video_path)
img_files, pos, target_sz, should_resize_image, ground_truth, video_path = info
# 把填充考虑进去，定义为窗口大小。
sz = pylab.floor(target_sz * (1 + padding))
# 计算想要的高斯形状的输出，其中带宽正比于目标矩形框大小
output_sigma = pylab.sqrt(pylab.prod(target_sz)) * output_sigma_factor
# 平移目标矩形框的高度，以中心点为圆点，得到高度坐标列表
# 平移目标矩形框的宽度，以中心点为圆点，得到宽度坐标列表
grid_y = pylab.arange(sz[0]) - pylab.floor(sz[0] / 2)
grid_x = pylab.arange(sz[1]) - pylab.floor(sz[1] / 2)
# 把坐标列表边长坐标矩阵，即对二维平面范围内的区域进行网格划分
rs, cs = pylab.meshgrid(grid_x, grid_y)
# 论文中公式 (19)，计算得到 [0, 1] 值，越靠近中心点值越大，反之越小
y = pylab.exp((-0.5 / output_sigma ** 2) * (rs ** 2 + cs ** 2))
# 计算二维离散傅里叶变换
yf = pylab.fft2(y)
# 首先计算矩形框高（某一个整数值）的 Hanning 窗（加权的余弦窗），其次计算矩形框宽的 Hanning 窗
# 最后计算两个向量的外积得到矩形框的余弦窗
cos_window = pylab.outer(pylab.hanning(sz[0]), pylab.hanning(sz[1]))
# 计算 FPS
total_time = 0 # to calculate FPS
# 计算精度值
positions = pylab.zeros((len(img_files), 2)) # to calculate precision
# global z, response
plot_tracking.z = None
alphaf = None
plot_tracking.response = None
# 依次访问图像从图像名列表中
for frame, image_filename in enumerate(img_files):
if (frame % 10) == 0:
print("Processing frame", frame)
# 读取图像
image_path = os.path.join(video_path, image_filename)
im = pylab.imread(image_path)
# 如果图像是彩色图像，则转化为灰度图像
if len(im.shape) == 3 and im.shape[2] > 1:
im = rgb2gray.rgb2gray(im)
# 如果需要进行图像缩放，则缩放为原来一半
if should_resize_image:
im = np.array(Image.fromarray(im).resize((int(im.shape[0] / 2), int(im.shape[1] / 2))))
# 开始计时
start_time = time.time()
# 提取并预处理子窗口，采用余弦子窗口
x = get_subwindow.get_subwindow(im, pos, sz, cos_window)
is_first_frame = (frame == 0)
# 不过不是第一帧，则计算分类器的响应
if not is_first_frame:
# 计算分类器在所有位置上的相应
k = dense_gauss_kernel.dense_gauss_kernel(sigma, x, plot_tracking.z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(alphaf, kf)
plot_tracking.response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# 最大响应就是目标位置
r = plot_tracking.response
row, col = pylab.unravel_index(r.argmax(), r.shape)
pos = pos - pylab.floor(sz / 2) + [row, col]
if debug:
print("Frame ==", frame)
print("Max response", r.max(), "at", [row, col])
pylab.figure()
pylab.imshow(cos_window)
pylab.title("cos_window")
pylab.figure()
pylab.imshow(x)
pylab.title("x")
pylab.figure()
pylab.imshow(plot_tracking.response)
pylab.title("response")
pylab.show(block=True)
# end "if not first frame"
# 获取目标位置的余弦窗口，用于训练分类器
x = get_subwindow.get_subwindow(im, pos, sz, cos_window)
# kernel 最小方差正则化，在傅里叶域计算参数 ALPHA
k = dense_gauss_kernel.dense_gauss_kernel(sigma, x)
new_alphaf = pylab.divide(yf, (pylab.fft2(k) + lambda_value)) # Eq. 7
new_z = x
if is_first_frame:
# 对于第一帧，训练单张图片
alphaf = new_alphaf
plot_tracking.z = x
else:
# 对于后续帧，进行模型参数插值
f = interpolation_factor
alphaf = (1 - f) * alphaf + f * new_alphaf
plot_tracking.z = (1 - f) * plot_tracking.z + f * new_z
# 保持当前位置，并计算 FPS
positions[frame, :] = pos
total_time += time.time() - start_time
# 可视化显示跟踪的结果
if show_tracking == "yes":
plot_tracking.plot_tracking(frame, pos, target_sz, im, ground_truth)
if should_resize_image:
positions = positions * 2
print("Frames-per-second:", len(img_files) / total_time)
title = os.path.basename(os.path.normpath(input_video_path))
if len(ground_truth) > 0:
# 画出精确率图像
show_precision.show_precision(positions, ground_truth, title)
def taylor_coeff(fun, N):
"""From L. Trefethen, Ten digits algorithms """
zz = exp(2j*pi*(array(list(range(N))))/N)
c = fft(fun(zz))/N
return real(c)
def pwcausalr(
x,
Nr,
Nl,
porder,
fs,
freq=0
): # Note: freq determines whether the frequency points are calculated or chosen
from pylab import size, shape, real, log, conj, zeros, arange, array
from numpy import linalg
det = linalg.det
import numpy as np # Just for "sum"; can't remember what's wrong with pylab's sum
[L, N] = shape(x)
#L is the number of channels, N is the total points in every channel
if freq == 0: F = timefreq(x[0, :], fs) # Define the frequency points
else: F = array(range(0, freq + 1)) # Or just pick them
npts = size(F, 0)
# Initialize arrays
maxindex = np.sum(arange(1, L))
pp = zeros((L, npts))
# Had these all defined on one line, and stupidly they STAY linked!!
cohe = zeros((maxindex, npts))
Fy2x = zeros((maxindex, npts))
Fx2y = zeros((maxindex, npts))
Fxy = zeros((maxindex, npts))
index = 0
for i in range(1, L):
for j in range(i + 1, L + 1):
y = zeros((2, N)) # Initialize y
index = index + 1
y[0, :] = x[i - 1, :]
y[1, :] = x[j - 1, :]
A2, Z2, tmp = armorf(y, Nr, Nl, porder)
#fitting a model on every possible pair
eyx = Z2[1, 1] - Z2[0, 1]**2 / Z2[0, 0]
#corrected covariance
exy = Z2[0, 0] - Z2[1, 0]**2 / Z2[1, 1]
f_ind = 0
for f in F:
f_ind = f_ind + 1
S2, H2 = spectrum_AR(A2, Z2, porder, f, fs)
pp[i - 1, f_ind - 1] = abs(S2[0, 0] * 2)
# revised
if (i == L - 1) & (j == L):
pp[j - 1, f_ind - 1] = abs(S2[1, 1] * 2)
# revised
cohe[index - 1,
f_ind - 1] = real(abs(S2[0, 1])**2 / S2[0, 0] / S2[1, 1])
Fy2x[index - 1, f_ind - 1] = log(
abs(S2[0, 0]) /
abs(S2[0, 0] - (H2[0, 1] * eyx * conj(H2[0, 1])) / fs))
#Geweke's original measure
Fx2y[index - 1, f_ind - 1] = log(
abs(S2[1, 1]) /
abs(S2[1, 1] - (H2[1, 0] * exy * conj(H2[1, 0])) / fs))
Fxy[index - 1, f_ind - 1] = log(
abs(S2[0, 0] - (H2[0, 1] * eyx * conj(H2[0, 1])) / fs) *
abs(S2[1, 1] -
(H2[1, 0] * exy * conj(H2[1, 0])) / fs) / abs(det(S2)))
return F, pp, cohe, Fx2y, Fy2x, Fxy
n_reS11 = keys.index('RE[S11]')
n_imS11 = keys.index('IM[S11]')
n_reS21 = keys.index('RE[S21]')
n_imS21 = keys.index('IM[S21]')
freq = data[:,n_freq]
S11 = data[:,n_reS11]+1j*data[:,n_imS11]
S21 = data[:,n_reS21]+1j*data[:,n_imS21]
for label, y, x in (('S11', S11, freq), ('S21',S21, freq)):
cur = curve.Curve()
cur.set_data(pandas.Series(y, index=x))
#res, fit_curve = cur.fit('lorentz_complex_sam')
res, fit_curve = cur.fit('lorentz_complex_thibault')
plot(real(fit_curve.data),imag(fit_curve.data), label='fit Q='+str(fit_curve.params['Q_c'])+';f='+str(fit_curve.params['omega_0']))
#plot(real(fit_curve.data),imag(fit_curve.data), label='fit Q='+str(fit_curve.params['Q'])+';f='+str(fit_curve.params['x0']))
#plot(real(cur.data),imag(cur.data), 'o', label=label)
legend()
show()
title(filename)
savefig(filename + '.pdf')
savefig(filename + '.png')
mpos = m,
loc = (1, 0, 1))
f = PowerSpectra(time_data = t,
window = 'Hanning',
overlap = '50%',
block_size = 4096)
###################################################################
### Plotting ###
from pylab import figure,plot,show,xlim,ylim,xscale,xticks,xlabel,ylabel,grid,real
from acoular import L_p
band = 3 # octave: 1 ; 1/3-octave: 3
(f_borders, p, f_center) = barspectrum(real(f.csm[:,0,0]), f.fftfreq(), band)
label_freqs = [str(int(_)) for _ in f_center]
figure(figsize=(20, 6))
plot(f_borders,L_p(p))
xlim(f_borders[0]*2**(-1./6),f_borders[-1]*2**(1./6))
ylim(40,90)
xscale('symlog')
xticks(f_center,label_freqs)
xlabel('f in Hz')
ylabel('SPL in dB')
def update(self, new_img):
self.canvas = new_img.copy()
self.trackNo +=1
res_max = 0.
for scale_rate in self.scale_ratios:
template_size = scale_rate * self.window_sz_new
# get subwindow at current estimated target position, to train classifer
x = self.get_subwindow(new_img, self.pos_list[-1], template_size)
# calculate response of the classifier at all locations
k = self.dense_gauss_kernel(self.sigma, x, self.z)
kf = pylab.fft2(k)
alphaf_kf = pylab.multiply(self.alphaf, kf)
response = pylab.real(pylab.ifft2(alphaf_kf)) # Eq. 9
# target location is at the maximum response
r = response
row, col = pylab.unravel_index(r.argmax(), r.shape)
if res_max< np.max(r):
res_row = int(row*scale_rate)
res_col = int(col*scale_rate)
self.window_sz_new = template_size
self.target_sz = self.target_sz*scale_rate
res_ave, res_max, self.psr = self.response_win_ave_max(response, col, row, winsize=12)
self.scale_rate = scale_rate
#roi rect's topleft point add [row, col]
pos = self.pos_list[-1] - pylab.floor(self.window_sz_new / 2) + [res_row, res_col]
rect = pylab.array([pos[1] - self.target_sz[1] / 2, pos[0] - self.target_sz[0] / 2, self.target_sz[1], self.target_sz[0]])
rect = rect.astype(np.int)
#print (self.target_sz, self.psr, self.scale_rate)
if debug:
if self.trackNo == 1:
#pylab.ion() # interactive mode on
self.fig, self.axes = pylab.subplots(ncols=3)
self.fig.show()
# We need to draw the canvas before we start animating...
self.fig.canvas.draw()
k_img = self.axes[0].imshow(k,animated=True)
x_img = self.axes[1].imshow(x,animated=True)
r_img = self.axes[2].imshow(response,animated=True)
self.subimgs = [k_img, x_img, r_img]
# Let's capture the background of the figure
self.backgrounds = [self.fig.canvas.copy_from_bbox(ax.bbox) for ax in self.axes]
# tracking_rectangle = pylab.Rectangle((0, 0), 0, 0)
# tracking_rectangle.set_color((1, 0, 0, 0.5))
# tracking_figure_axes.add_patch(tracking_rectangle)
#
# gt_point = pylab.Circle((0, 0), radius=5)
# gt_point.set_color((0, 0, 1, 0.5))
# tracking_figure_axes.add_patch(gt_point)
# tracking_figure_title = tracking_figure.suptitle("")
pylab.show(block=False)
#self.fig.show()
else:
self.subimgs[0].set_data(k)
self.subimgs[1].set_data(x)
self.subimgs[2].set_data(response)
items = enumerate(zip(self.subimgs, self.axes, self.backgrounds), start=1)
for j, (subimg, ax, background) in items:
self.fig.canvas.restore_region(background)
ax.draw_artist(subimg)
self.fig.canvas.blit(ax.bbox)
pylab.show(block=False)
if self.psr > 10:
#computing new_alphaf and observed x as z
x = self.get_subwindow(new_img, pos, self.window_sz_new)
# Kernel Regularized Least-Squares, calculate alphas (in Fourier domain)
k = self.dense_gauss_kernel(self.sigma, x)
new_alphaf = pylab.divide(self.yf, (pylab.fft2(k) + self.lambda_value)) # Eq. 7
new_z = x
# subsequent frames, interpolate model
f = self.interpolation_factor
self.alphaf = (1 - f) * self.alphaf + f * new_alphaf
self.z = (1 - f) * self.z + f * new_z
self.roi_list.append(self.get_imageROI(new_img, rect))
self.pos_list.append(pos)
self.rect_list.append(rect)
ok = 1
return ok, rect, self.psr