def fresnelSingleTransformFW(self,d) :
i2 = Intensity2D(self.nx,self.startx,self.endx,
self.ny,self.starty,self.endy,
self.wl)
u1p = self.i*pl.exp(-1j*pl.pi/(d*self.wl)*(self.xgrid**2+self.ygrid**2))
ftu1p = pl.fftshift(pl.fft2(pl.fftshift(u1p)))
i2.i = ftu1p*1j/(d*self.wl)*pl.exp(-1j*pl.pi/(d*self.wl)*(self.xgrid**2+self.ygrid**2))
return i2
def fresnelSingleTransformFW(self, d):
i2 = Intensity2D(self.nx, self.startx, self.endx, self.ny, self.starty,
self.endy, self.wl)
u1p = self.i * pl.exp(-1j * pl.pi / (d * self.wl) *
(self.xgrid**2 + self.ygrid**2))
ftu1p = pl.fftshift(pl.fft2(pl.fftshift(u1p)))
i2.i = ftu1p * 1j / (d * self.wl) * pl.exp(
-1j * pl.pi / (d * self.wl) * (self.xgrid**2 + self.ygrid**2))
return i2
def frc(image):
from PYME.Analysis import binAvg
import numpy as np
import pylab
voxelsize = image.voxelsize
shape = image.data.shape[0:2]
hwin = np.sqrt(np.outer(np.hanning(shape[0]), np.hanning(shape[1])))
#assume we have exactly 2 channels #FIXME - add a selector
#grab image data
imA = hwin * image.data[:, :, :, 0].squeeze()
imB = hwin * image.data[:, :, :, 1].squeeze()
X, Y = np.mgrid[0:float(imA.shape[0]), 0:float(imA.shape[1])]
X = X / X.shape[0]
Y = Y / X.shape[1]
X = X - .5
Y = Y - .5
R = np.sqrt(X**2 + Y**2)
H1 = pylab.fft2(imA)
H2 = pylab.fft2(imB)
ringwidth = 1 # in pixels
rB = np.linspace(0, 0.5, 0.5 * imA.shape[0] / ringwidth)
bn, bm, bs = binSum(R, pylab.fftshift(H1 * H2.conjugate()), rB)
bn1, bm1, bs1 = binSum(R, pylab.fftshift(abs(H1 * H1.conjugate())), rB)
bn2, bm2, bs2 = binSum(R, pylab.fftshift(abs(H2 * H2.conjugate())), rB)
bmr = np.real(bm)
pylab.figure()
ax = pylab.gca()
freqpnm = rB / voxelsize[0]
ax.plot(freqpnm[:-1], bmr / np.sqrt(bm1 * bm2))
ax.plot(freqpnm[:-1], 2. / np.sqrt(bn / 2))
ax.plot(freqpnm[:-1], 0 * bmr + 1.0 / 7)
ax.plot(freqpnm[:-1], 0 * bmr, '--')
xt = np.array([10., 15, 20, 30, 50, 80, 100, 150])
rt = 1.0 / xt
pylab.xticks(rt[::-1], ['%d' % xi for xi in xt[::-1]])
pylab.show()
return H1, H2, R, bmr / np.sqrt(bm1 * bm2), bn, bm, bm1, bm2, rB
def fresnelSingleTransformVW(self,d) :
# compute new window
x2 = self.nx*pl.absolute(d)*self.wl/(self.endx-self.startx)
y2 = self.ny*pl.absolute(d)*self.wl/(self.endy-self.starty)
# create new intensity object
i2 = Intensity2D(self.nx,-x2/2,x2/2,
self.ny,-y2/2,y2/2,
self.wl)
# compute intensity
u1p = self.i*pl.exp(-1j*pl.pi/(d*self.wl)*(self.xgrid**2+self.ygrid**2))
ftu1p = pl.fftshift(pl.fft2(pl.fftshift(u1p)))
i2.i = ftu1p*1j/(d*i2.wl)*pl.exp(-1j*pl.pi/(d*i2.wl)*(i2.xgrid**2+i2.ygrid**2))
return i2
def Fraunhofer(i, z) :
print "Propagation:Fraunhofer"
ft = pl.fftshift(pl.fftn(pl.fftshift(i.i)))
dx = i.wl*z/(i.nx*i.dx)
dy = i.wl*z/(i.ny*i.dy)
po = pl.exp(1j*2*pl.pi/i.wl*i.dx*i.dx)/(1j*i.wl*z)
p = pl.arange(0,i.nx)-(i.nx+0.5)/2.0
q = pl.arange(0,i.ny)-(i.ny+0.5)/2.0
[pp,qq] = pl.meshgrid(p,q)
pm = pl.exp(1j*pl.pi/(i.wl*z)*((pp*dx)**2+(qq*dy)**2))
i2 = Intensity.Intensity2D(i.nx,-i.nx*dx/2,i.nx*dy/2,i.ny,-i.ny*dy/2,i.ny*dy/2)
i2.i = po*pm*ft
return i2
print "Propagation:Fraunhofer>",dx,dy,i.nx*dx,i.ny*dy
def compute_response(self, **kargs):
"""Compute the window data frequency response
:param norm: True by default. normalised the frequency data.
:param int NFFT: total length of the final data sets( 2048 by default. if less than data length, then
NFFT is set to the data length*2).
The response is stored in :attr:`response`.
.. note:: Units are dB (20 log10) since we plot the frequency response)
"""
from pylab import fft, fftshift, log10
norm = kargs.get('norm', self.norm)
# do some padding. Default is max(2048, data.len*2)
NFFT = kargs.get('NFFT', 2048)
if NFFT < len(self.data):
NFFT = self.data.size * 2
# compute the fft modulus
A = fft(self.data, NFFT)
mag = abs(fftshift(A))
# do we want to normalise the data
if norm is True:
mag = mag / max(mag)
response = 20. * log10(mag) # factor 20 we are looking at the response
# not the powe
#response = clip(response,mindB,100)
self.__response = response
def compute_response(self, **kargs):
"""Compute the window data frequency response
:param norm: True by default. normalised the frequency data.
:param int NFFT: total length of the final data sets( 2048 by default. if less than data length, then
NFFT is set to the data length*2).
The response is stored in :attr:`response`.
.. note:: Units are dB (20 log10) since we plot the frequency response)
"""
from pylab import fft, fftshift, log10
norm = kargs.get('norm', self.norm)
# do some padding. Default is max(2048, data.len*2)
NFFT = kargs.get('NFFT', 2048)
if NFFT < len(self.data):
NFFT = self.data.size * 2
# compute the fft modulus
A = fft(self.data, NFFT)
mag = abs(fftshift(A))
# do we want to normalise the data
if norm is True:
mag = mag / max(mag)
response = 20. * log10(mag) # factor 20 we are looking at the response
# not the powe
#response = clip(response,mindB,100)
self.__response = response
def fresnelConvolutionTransform(self, d):
# make intensity distribution
i2 = Intensity2D(self.nx, self.startx, self.endx, self.ny, self.starty,
self.endy, self.wl)
# FT on inital distribution
u1ft = pl.fft2(self.i)
# 2d convolution kernel
k = 2 * pl.pi / i2.wl
# make spatial frequency matrix
maxsfx = 2 * pl.pi / self.dx
maxsfy = 2 * pl.pi / self.dy
dsfx = 2 * maxsfx / (self.nx)
dsfy = 2 * maxsfy / (self.ny)
self.sfx = pl.arange(-maxsfx / 2, maxsfx / 2 + 1e-15, dsfx / 2)
self.sfy = pl.arange(-maxsfy / 2, maxsfy / 2 + 1e-15, dsfy / 2)
[self.sfxgrid,
self.sfygrid] = pl.fftshift(pl.meshgrid(self.sfx, self.sfy))
# make convolution kernel
kern = pl.exp(1j * d * (self.sfxgrid**2 + self.sfygrid**2) / (2 * k))
# apply convolution kernel and invert
i2.i = pl.ifft2(kern * u1ft)
return i2
def fresnelSingleTransformVW(self, d):
# compute new window
x2 = self.nx * pl.absolute(d) * self.wl / (self.endx - self.startx)
y2 = self.ny * pl.absolute(d) * self.wl / (self.endy - self.starty)
# create new intensity object
i2 = Intensity2D(self.nx, -x2 / 2, x2 / 2, self.ny, -y2 / 2, y2 / 2,
self.wl)
# compute intensity
u1p = self.i * pl.exp(-1j * pl.pi / (d * self.wl) *
(self.xgrid**2 + self.ygrid**2))
ftu1p = pl.fftshift(pl.fft2(pl.fftshift(u1p)))
i2.i = ftu1p * 1j / (d * i2.wl) * pl.exp(-1j * pl.pi / (d * i2.wl) *
(i2.xgrid**2 + i2.ygrid**2))
return i2
def Fraunhofer(i, z):
print "Propagation:Fraunhofer"
ft = pl.fftshift(pl.fftn(pl.fftshift(i.i)))
dx = i.wl * z / (i.nx * i.dx)
dy = i.wl * z / (i.ny * i.dy)
po = pl.exp(1j * 2 * pl.pi / i.wl * i.dx * i.dx) / (1j * i.wl * z)
p = pl.arange(0, i.nx) - (i.nx + 0.5) / 2.0
q = pl.arange(0, i.ny) - (i.ny + 0.5) / 2.0
[pp, qq] = pl.meshgrid(p, q)
pm = pl.exp(1j * pl.pi / (i.wl * z) * ((pp * dx)**2 + (qq * dy)**2))
i2 = Intensity.Intensity2D(i.nx, -i.nx * dx / 2, i.nx * dy / 2, i.ny,
-i.ny * dy / 2, i.ny * dy / 2)
i2.i = po * pm * ft
return i2
print "Propagation:Fraunhofer>", dx, dy, i.nx * dx, i.ny * dy
def fresnelConvolutionTransform(self,d) :
# make intensity distribution
i2 = Intensity2D(self.nx,self.startx,self.endx,
self.ny,self.starty,self.endy,
self.wl)
# FT on inital distribution
u1ft = pl.fft2(self.i)
# 2d convolution kernel
k = 2*pl.pi/i2.wl
# make spatial frequency matrix
maxsfx = 2*pl.pi/self.dx
maxsfy = 2*pl.pi/self.dy
dsfx = 2*maxsfx/(self.nx)
dsfy = 2*maxsfy/(self.ny)
self.sfx = pl.arange(-maxsfx/2,maxsfx/2+1e-15,dsfx/2)
self.sfy = pl.arange(-maxsfy/2,maxsfy/2+1e-15,dsfy/2)
[self.sfxgrid, self.sfygrid] = pl.fftshift(pl.meshgrid(self.sfx,self.sfy))
# make convolution kernel
kern = pl.exp(1j*d*(self.sfxgrid**2+self.sfygrid**2)/(2*k))
# apply convolution kernel and invert
i2.i = pl.ifft2(kern*u1ft)
return i2
def _gen_bead_pupil(X, Y, beadsize):
r2 = X*X + Y*Y
dx = X[1, 0] - X[0, 0]
bead_proj = np.sqrt(np.maximum(beadsize*beadsize - (r2 - dx*dx), 0))
return abs(fftshift(fftn(bead_proj)))
def angularSpectrum(self, d):
# make intensity distribution
i2 = Intensity2D(self.nx, self.startx, self.endx, self.ny, self.starty,
self.endy, self.wl)
# Angular spectrum (FT of input wavefield)
a = pl.fft2(pl.fftshift(self.i))
print a
# 2d convolution kernel
k = 2 * pl.pi / self.wl
print k
# make spatial frequency matrix
maxsfx = 2 * pl.pi / self.dx
maxsfy = 2 * pl.pi / self.dy
print maxsfx, maxsfy
dsfx = 2 * maxsfx / (self.nx)
dsfy = 2 * maxsfy / (self.ny)
self.sfx = pl.arange(-maxsfx / 2, maxsfx / 2 + 1e-15, dsfx / 2)
self.sfy = pl.arange(-maxsfy / 2, maxsfy / 2 + 1e-15, dsfy / 2)
print self.sfx
print self.sfy
[self.sfxgrid, self.sfygrid] = pl.meshgrid(self.sfx, self.sfy)
# angular spectrum propagation kernel
aspk = pl.fftshift(
pl.exp(1j * d * pl.sqrt(k**2 -
(self.sfxgrid**2 + self.sfygrid**2))))
print "Angular spectrum propagation kernel"
print aspk
# apply angular spectrum propagation kernel and inverse Fourier transform
i2.i = pl.fftshift(pl.ifft2(aspk * a))
print i2.i
return i2
def angularSpectrum(self,d) :
# make intensity distribution
i2 = Intensity2D(self.nx,self.startx,self.endx,
self.ny,self.starty,self.endy,
self.wl)
# Angular spectrum (FT of input wavefield)
a = pl.fft2(pl.fftshift(self.i))
print a
# 2d convolution kernel
k = 2*pl.pi/self.wl
print k
# make spatial frequency matrix
maxsfx = 2*pl.pi/self.dx
maxsfy = 2*pl.pi/self.dy
print maxsfx,maxsfy
dsfx = 2*maxsfx/(self.nx)
dsfy = 2*maxsfy/(self.ny)
self.sfx = pl.arange(-maxsfx/2,maxsfx/2+1e-15,dsfx/2)
self.sfy = pl.arange(-maxsfy/2,maxsfy/2+1e-15,dsfy/2)
print self.sfx
print self.sfy
[self.sfxgrid, self.sfygrid] = pl.meshgrid(self.sfx,self.sfy)
# angular spectrum propagation kernel
aspk = pl.fftshift(pl.exp(1j*d*pl.sqrt(k**2 -(self.sfxgrid**2 + self.sfygrid**2))))
print "Angular spectrum propagation kernel"
print aspk
# apply angular spectrum propagation kernel and inverse Fourier transform
i2.i = pl.fftshift(pl.ifft2(aspk*a))
print i2.i
return i2
def OnColoc(self, event):
from PYME.Analysis import binAvg
voxelsize = self.image.voxelsize
#assume we have exactly 2 channels #FIXME - add a selector
#grab image data
imA = self.image.data[:,:,:,0].squeeze()
imB = self.image.data[:,:,:,1].squeeze()
X, Y = np.mgrid[0:float(imA.shape[0]), 0:float(imA.shape[1])]
X = X/X.shape[0]
Y = Y/X.shape[1]
X = X - .5
Y = Y - .5
R = np.sqrt(X**2 + Y**2)
H1 = pylab.fftn(imA)
H2 = pylab.fftn(imB)
rB = np.linspace(0,R.max())
bn, bm, bs = binAvg.binAvg(R, pylab.fftshift(abs(H1*H2)), rB)
bn1, bm1, bs1 = binAvg.binAvg(R, pylab.fftshift(abs(H1*H1)), rB)
bn2, bm2, bs2 = binAvg.binAvg(R, pylab.fftshift(abs(H2*H2)), rB)
pylab.figure()
ax = pylab.gca()
ax.plot(rB[:-1], bm/np.sqrt(bm1*bm2))
ax.plot(rB[:-1], 2./np.sqrt(bn/2))
xt = np.array([10., 15, 20, 30, 50, 80, 100, 150])
rt = voxelsize[0]/xt
pylab.xticks(rt[::-1],['%d' % xi for xi in xt[::-1]])
pylab.show()
def abscorrel(a, b):
from scipy.fftpack import fftn, ifftn
from pylab import fftshift, ifftshift
import numpy as np
F0 = fftn(a)
Fi = ifftn(b)
corr = abs(fftshift(ifftn(F0 * Fi)))
return corr
def plot_image(in_file, function, plot_mask, plot_log, plot_shifted):
# try:
# #img = spimage.sp_image_read(in_file,0)
image, mask = sphelper.import_spimage(in_file, ['image', 'mask'])
# except:
# raise TypeError("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
colormap = "jet"
if function == "phase":
colormap = "hsv"
if plot_shifted:
#img = spimage.sp_image_shift(img)
image = pylab.fftshift(image)
mask = pylab.fftshift(mask)
def no_log(x):
return x
if plot_log:
log_function = pylab.log
else:
log_function = no_log
if plot_mask:
plot_input = mask
else:
plot_input = image
function_dict = {"abs" : abs, "phase" : pylab.angle, "real" : pylab.real, "imag" : pylab.imag}
pylab.imshow(log_function(function_dict[function](plot_input)), cmap=colormap, origin="lower", interpolation="nearest")
pylab.show()
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 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 test_plot(fpgaclient, bandwidth, snap_depth, dec_rate, n_inputs, signal_input, lof):
"""
fpgaclient:
bandwidth: ADC working badnwidth
snap_depth: depth of the snap blocks
dec_rate: decimation rate
n_inputs: number of simutaneous inputs (2^n)
signal_input: known frequency of the test tone
lof: lo frequency
"""
data_dict = read_snaps(fpgaclient, snap_depth)
pol1_re = data_dict['cic1_re']
pol1_re = pol1_re[0::(dec_rate/(2**n_inputs))]
x = []
a = -bandwidth*1.0/dec_rate
for i in range(size(pol1_re)):
x.append(a)
a = a + 2.0*(bandwidth/dec_rate)/size(pol1_re)
pylab.ion()
pylab.figure()
pylab.subplot(231)
pylab.title('ADC data')
pylab.xlabel('N')
pylab.plot(data_dict['adc1'][100:500], '-o')
pylab.hold(False)
pylab.subplot(232)
pylab.title('mixer_data')
pylab.plot(data_dict['s1_mixer'][100:200], '-o')
pylab.hold(False)
pylab.subplot(233)
pylab.title('cic data')
pylab.plot(pol1_re[100:200], '-o')
pylab.hold(False)
pol1_re_fft = fft(pol1_re)
pylab.subplot(234)
pylab.title('Mixed FFT, Signal: '+str(signal_input)+'MHz, LO: '+str(lof)+'MHz')
pylab.xlabel('Frequency: MHz')
pylab.semilogy(x,abs(pylab.fftshift((pol1_re_fft))))
pylab.subplot(235)
pylab.title('first cic data')
pylab.plot(data_dict['s1_firstcic'][100:200], '-o')
pylab.hold(False)
pylab.subplot(236)
pylab.title('halfband data')
pylab.plot(data_dict['s1_halfband'][100:200], '-o')
return pol1_re, x
def handler(self, msg):
# get input
x = pmt.to_python(pmt.cdr(msg))
meta = pmt.car(msg)
samples = pmt.cdr(msg)
# pass data
self.curve_data[0] = (
numpy.linspace(1, len(x), len(x)),
10 * numpy.log10(numpy.abs(pylab.fftshift(numpy.fft.fft(x)))))
# trigger update
self.emit(QtCore.SIGNAL("updatePlot(int)"), 0)
def OnColoc(self, event):
from PYME.Analysis import binAvg
voxelsize = self.image.voxelsize
#assume we have exactly 2 channels #FIXME - add a selector
#grab image data
imA = self.image.data[:, :, :, 0].squeeze()
imB = self.image.data[:, :, :, 1].squeeze()
X, Y = np.mgrid[0:float(imA.shape[0]), 0:float(imA.shape[1])]
X = X / X.shape[0]
Y = Y / X.shape[1]
X = X - .5
Y = Y - .5
R = np.sqrt(X**2 + Y**2)
H1 = pylab.fftn(imA)
H2 = pylab.fftn(imB)
rB = np.linspace(0, R.max())
bn, bm, bs = binAvg.binAvg(R, pylab.fftshift(abs(H1 * H2)), rB)
bn1, bm1, bs1 = binAvg.binAvg(R, pylab.fftshift(abs(H1 * H1)), rB)
bn2, bm2, bs2 = binAvg.binAvg(R, pylab.fftshift(abs(H2 * H2)), rB)
pylab.figure()
ax = pylab.gca()
ax.plot(rB[:-1], bm / np.sqrt(bm1 * bm2))
ax.plot(rB[:-1], 2. / np.sqrt(bn / 2))
xt = np.array([10., 15, 20, 30, 50, 80, 100, 150])
rt = voxelsize[0] / xt
pylab.xticks(rt[::-1], ['%d' % xi for xi in xt[::-1]])
pylab.show()
def OnCheckSpacing(self, event):
voxx = 0.07
voxy = 0.07
im = self.scope.frameWrangler.currentFrame
F = (abs(pylab.fftshift(pylab.fftn(im - im.mean()))) + 1e-2).squeeze()
currVoxelSizeID = self.scope.settingsDB.execute(
"SELECT sizeID FROM VoxelSizeHistory ORDER BY time DESC").fetchone(
)
if not currVoxelSizeID is None:
voxx, voxy = self.scope.settingsDB.execute(
"SELECT x,y FROM VoxelSizes WHERE ID=?",
currVoxelSizeID).fetchone()
pylab.figure(2)
pylab.clf()
xd = F.shape[0] / 2.
yd = F.shape[1] / 2.
cd = xd * 2 * voxx / 5
#kill central spike
F[(xd - cd):(xd + cd), (yd - cd):(yd + cd)] = F.mean()
pylab.imshow(F.T, interpolation='nearest', cmap=cm.hot)
xd = F.shape[0] / 2.
yd = F.shape[1] / 2.
pylab.plot(
xd + (xd * 2 * voxx / 1.8) * np.cos(np.arange(0, 2.1 * np.pi, .1)),
yd + (xd * 2 * voxx / 1.8) * np.sin(np.arange(0, 2.1 * np.pi, .1)),
lw=2,
label='$1.8 {\mu}m$')
pylab.plot(
xd + (xd * 2 * voxx / 2.) * np.cos(np.arange(0, 2.1 * np.pi, .1)),
yd + (xd * 2 * voxx / 2.) * np.sin(np.arange(0, 2.1 * np.pi, .1)),
lw=1,
label='$2 {\mu}m$')
pylab.plot(
xd + (xd * 2 * voxx / 1.6) * np.cos(np.arange(0, 2.1 * np.pi, .1)),
yd + (xd * 2 * voxx / 1.6) * np.sin(np.arange(0, 2.1 * np.pi, .1)),
lw=1,
label='$1.6 {\mu}m$')
pylab.xlim(xd - xd * 2 * voxx / 1, xd + xd * 2 * voxx / 1)
pylab.ylim(yd - xd * 2 * voxx / 1, yd + xd * 2 * voxx / 1)
pylab.legend()
self.F = F
def OnCorrelate(self, event):
from scipy.fftpack import fftn, ifftn
from pylab import fftshift, ifftshift
import numpy as np
#ch0 = self.image.data[:,:,:,0]
chanList = self.image.data.dataList
for i in range(len(self.rbs)):
if self.rbs[i].GetValue():
ch0 = self.image.data[:, :, :, i]
ch0 = np.maximum(ch0 - ch0.mean(), 0)
F0 = fftn(ch0)
for i in range(self.image.data.shape[3]):
if not self.rbs[i].GetValue():
ch0 = self.image.data[:, :, :, i]
ch0 = np.maximum(ch0 - ch0.mean(), 0)
Fi = ifftn(ch0)
corr = abs(fftshift(ifftn(F0 * Fi)))
corr -= corr.min()
corr = np.maximum(corr - corr.max() * .75, 0)
xi, yi, zi = np.where(corr)
corr_s = corr[corr > 0]
corr_s /= corr_s.sum()
dxi = ((xi * corr_s).sum() -
corr.shape[0] / 2.) * chanList[i].voxelsize[0]
dyi = ((yi * corr_s).sum() -
corr.shape[1] / 2.) * chanList[i].voxelsize[1]
dzi = ((zi * corr_s).sum() -
corr.shape[2] / 2.) * chanList[i].voxelsize[2]
self.xctls[i].SetValue(str(int(dxi)))
self.yctls[i].SetValue(str(int(dyi)))
self.zctls[i].SetValue(str(int(dzi)))
self.OnApply(None)
def propagate(self, F, z):
""" Propagate a complex pupil, F, a distance z from the nominal focus and return the electric field amplitude
Parameters
==========
F : 2D array
complex pupil
z : float
distance in nm to propagate
"""
pf = self.propFac*float(z)
fs = F*self.pfm*(np.cos(pf) + j*np.sin(pf))
self._F[:] = ifftshift(fs)
self._plan_F_f()
return fftshift(self._f/np.sqrt(self._f.size))
def OnCorrelate(self, event):
from scipy.fftpack import fftn, ifftn
from pylab import fftshift, ifftshift
import numpy as np
# ch0 = self.image.data[:,:,:,0]
chanList = self.image.data.dataList
for i in range(len(self.rbs)):
if self.rbs[i].GetValue():
ch0 = self.image.data[:, :, :, i]
ch0 = np.maximum(ch0 - ch0.mean(), 0)
F0 = fftn(ch0)
for i in range(self.image.data.shape[3]):
if not self.rbs[i].GetValue():
ch0 = self.image.data[:, :, :, i]
ch0 = np.maximum(ch0 - ch0.mean(), 0)
Fi = ifftn(ch0)
corr = abs(fftshift(ifftn(F0 * Fi)))
corr -= corr.min()
corr = np.maximum(corr - corr.max() * 0.75, 0)
xi, yi, zi = np.where(corr)
corr_s = corr[corr > 0]
corr_s /= corr_s.sum()
dxi = ((xi * corr_s).sum() - corr.shape[0] / 2.0) * chanList[i].voxelsize[0]
dyi = ((yi * corr_s).sum() - corr.shape[1] / 2.0) * chanList[i].voxelsize[1]
dzi = ((zi * corr_s).sum() - corr.shape[2] / 2.0) * chanList[i].voxelsize[2]
self.xctls[i].SetValue(str(int(dxi)))
self.yctls[i].SetValue(str(int(dyi)))
self.zctls[i].SetValue(str(int(dzi)))
self.OnApply(None)
def propagate_r(self, f, z):
"""
Backpropagate an electric field distribution, f, at defocus z to the nominal focus and return the complex pupil
Parameters
----------
f : 2D array
complex electric field amplitude
z : float
nominal distance of plane from focus in nm
Returns
-------
"""
self._f[:] = fftshift(f)
self._plan_f_F()
pf = -self.propFac*float(z)
return (ifftshift(self._F)*(np.cos(pf)+j*np.sin(pf)))/np.sqrt(self._f.size)
def propagate(self, F, z):
"""
Propagate a complex pupil, F, a distance z from the nominal focus and return the electric field amplitude
Parameters
==========
F : 2D array
complex pupil
z : float
distance in nm to propagate
"""
pf = self.propFac*float(z)
r = max(self.appR*(1 -self.apertureZGrad*z), 0)
M = (self.x*self.x + self.y*self.y) < (r*r)
fs = F*M*self.pfm*(np.cos(pf) + j*np.sin(pf))
self._F[:] = fftshift(fs)
self._plan_F_f()
return ifftshift(self._f/np.sqrt(self._f.size))
T = arange(0.0,float(N),1.0)
MyPi = 3.1416
xReal = cos(2.0*MyPi*f0MHz*T/fsMHz);
xRealmul = cos(2.0*MyPi*f0MHz*T/fsMHz)*cos(2.0*MyPi*f0MHzmul*T/fsMHz)
xComplex = exp(1j*2.0*MyPi*f0MHz*T/fsMHz);
xComplexneg = exp(-1j*2.0*MyPi*f0MHz*T/fsMHz);
xRealF = (1.0/N)*fft(xReal,N);
xRealFmul= (1.0/N)*fft(xRealmul,N);
xComplexF = (1.0/N)*fft(xComplex,N);
xComplexFneg = (1.0/N)*fft(xComplexneg,N);
Tplot = arange(-N/2.0,N/2.0,1)
subplot(5,1,1)
plot(Tplot*fsMHz/N,(fftshift(abs(xRealF))));
subplot(5,1,2)
plot(Tplot*fsMHz/N,(fftshift(abs(xComplexF))));
subplot(5,1,3)
plot(Tplot*fsMHz/N,(fftshift(abs(xComplexFneg))));
subplot(5,1,4)
plot(Tplot*fsMHz/N,(fftshift(abs(xRealFmul))));
show()
f=open('output.txt','w')
file_output.comple_w(f, xReal, 'xReal')
file_output.comple_w(f, xComplex, 'xComplex')
file_output.comple_w(f, xRealF, 'xRealF')
file_output.comple_w(f, xComplexF, 'xComplexF')
f.close()
#get the gaussian kernel
w = 100
h = 100
in_mask = np.zeros((h, w), dtype=np.float32)
in_mask[int(h / 2), int(w / 2)] = 1
img_kernel = ndimage.gaussian_laplace(in_mask, sigma=2)
#
kernel = img_kernel[50 - 10:50 + 10, 50 - 10:50 + 10]
kernel_ft = fftpack.fft2(kernel, shape=img.shape[:2], axes=(0, 1))
#manual pad zeros, same results.
kernel_pad = np.zeros_like(img, dtype='float')
kh, kw = kernel.shape[:2]
kernel_pad[:kh, :kw] = kernel
kernel_pad_ft = fftpack.fft2(kernel_pad, axes=(0, 1))
fig1, axs = plt.subplots(1, 3)
axs[0].imshow(np.abs(pylab.fftshift(kernel_ft)))
axs[1].imshow(np.abs(pylab.fftshift(kernel_pad_ft)))
axs[2].imshow(np.abs(kernel_pad_ft - kernel_ft))
# convolve
img_ft = fftpack.fft2(img, axes=(0, 1))
img2_ft = kernel_ft * img_ft
img2 = fftpack.ifft2(img2_ft, axes=(0, 1)).real
img2 = (img2 - np.min(img2)) / (np.max(img2) - np.min(img2))
axes[2].imshow(img2, cmap='gray')
axes[2].set_title('blur via Gaussian filter')
plt.show()
MyPi = pi
ModRatio = 0.5
xInput = cos(2.0*MyPi*finput*T/fsmod)
xCarrier = cos(2.0*MyPi*fcarr*T/fsmod)
xMod = (xInput * ModRatio + 1) * xCarrier
xInputF = (1.0/N)*fft(xInput,N);
xCarrierF = (1.0/N)*fft(xCarrier,N);
xModF = (1.0/N)*fft(xMod,N);
#xComplexFneg = (1.0/N)*fft(xComplexneg,N);
Tplot = arange(-N/2.0,N/2.0,1)
pic_n=5
subplot(pic_n,1,1)
plot(Tplot*fsmod/N,(fftshift(abs(xModF))));
subplot(pic_n,1,2)
plot(Tplot*fsmod/N,(fftshift(abs(xCarrierF))));
subplot(pic_n,1,3)
plot(T,xInput);
subplot(pic_n,1,4)
plot(T,xMod);
subplot(pic_n,1,5)
plot(T,xCarrier);
#subplot(5,1,4)
#plot(Tplot*fsMHz/N,(fftshift(abs(xRealFmul))));
show()
#f=open('output.txt','w')
#file_output.comple_w(f, xReal, 'xReal')
#file_output.comple_w(f, xComplex, 'xComplex')
measureData[i, :] = analyzeSignal1
T1 = T1 / M
print('T1 = ', T1)
Vres = c0 / (2 * f0 * T1 * M * Mpad)
for ii in range(M):
sigRWin[ii, :] = measureData[ii, :] * windowFunction1
for ii in range(M):
sigRfft[ii, :] = fft(sigRWin[ii, :], N * Npad)
for ii in range(N * Npad):
sigDWin[:, ii] = sigRfft[:, ii] * windowFunction2
for ii in range(N * Npad):
sigDfft[:, ii] = fftshift(fft(sigDWin[:, ii], M * Mpad))
'''
plt.figure(1)
plt.contourf(Rres*np.arange(1,N*Npad+1),Vres*(np.arange(1,M*Mpad+1) - M*Mpad/2),np.abs(sigDfft))
plt.xlabel('Range/m')
plt.ylabel('Velocity/mps')
plt.pause(0.000001)
plt.cla()
'''
'''
np.savetxt('./Rres/Rres'+str(j)+'.txt',Rres*np.arange(1,N*Npad+1))
np.savetxt('./Vres/Vres'+str(j)+'.txt',Vres*(np.arange(1,M*Mpad+1) - M*Mpad/2))
np.savetxt('./sigDfft/sigDfft'+str(j)+'.txt',np.abs(sigDfft))
'''
plt.figure(1)
sigReceive = S1 + S2 + S3
sigRWin = np.zeros((L, N), dtype=complex)
sigDWin = np.zeros((L, N * Npad), dtype=complex)
sigRfft = np.zeros((L, N * Npad), dtype=complex)
sigDfft = np.zeros((L * Lpad, N * Npad), dtype=complex)
windowFunction1 = np.hanning(N) # windowFunction
windowFunction2 = np.hanning(L) # windowFunction
for ii in range(L):
sigRWin[ii, :] = sigReceive[ii, :] * windowFunction1
for ii in range(L):
sigRfft[ii, :] = fft(sigRWin[ii, :], N * Npad)
for ii in range(N * Npad):
sigDWin[:, ii] = sigRfft[:, ii] * windowFunction2
for ii in range(N * Npad):
sigDfft[:, ii] = fftshift(fft(sigDWin[:, ii], L * Lpad))
Rres = c / (2 * B * Npad)
Vres = c / (2 * 24.25 * 10**9 * T * L * Lpad)
plt.contourf(Rres * np.arange(1, N * Npad + 1),
Vres * (np.arange(1, L * Lpad + 1) - L * Lpad / 2),
np.abs(sigDfft))
plt.xlabel('Range/m')
plt.ylabel('Velocity/mps')
plt.title('Range-Doppler Map')
plt.minorticks_on()
plt.show()
MyPi = pi
ModRatio = 0.5
xInput = cos(2.0 * MyPi * finput * T / fsmod)
xCarrier = cos(2.0 * MyPi * fcarr * T / fsmod)
xMod = (xInput * ModRatio + 1) * xCarrier
xInputF = (1.0 / N) * fft(xInput, N)
xCarrierF = (1.0 / N) * fft(xCarrier, N)
xModF = (1.0 / N) * fft(xMod, N)
#xComplexFneg = (1.0/N)*fft(xComplexneg,N);
Tplot = arange(-N / 2.0, N / 2.0, 1)
pic_n = 5
subplot(pic_n, 1, 1)
plot(Tplot * fsmod / N, (fftshift(abs(xModF))))
subplot(pic_n, 1, 2)
plot(Tplot * fsmod / N, (fftshift(abs(xCarrierF))))
subplot(pic_n, 1, 3)
plot(T, xInput)
subplot(pic_n, 1, 4)
plot(T, xMod)
subplot(pic_n, 1, 5)
plot(T, xCarrier)
#subplot(5,1,4)
#plot(Tplot*fsMHz/N,(fftshift(abs(xRealFmul))));
show()
#f=open('output.txt','w')
#file_output.comple_w(f, xReal, 'xReal')
#file_output.comple_w(f, xComplex, 'xComplex')
pylab.plot(mixer_data[100:200], '-o')
#pylab.semilogy(abs(fft(mixer_data)))
pylab.hold(False)
pylab.subplot(223)
pylab.title('Available LO frequencies')
pylab.ylabel('MHz')
#pylab.plot(lof_avail,'-o')
pylab.plot(pol1_re[100:200], '-o')
pylab.hold(False)
pol1_re_fft = fft(pol1_re)
pylab.subplot(224)
pylab.title('Mixed FFT, Signal: '+str(signal_input)+'MHz, LO: '+str(lof_output)+'MHz')
pylab.xlabel('Frequency: MHz')
pylab.semilogy(x,abs(pylab.fftshift((pol1_re_fft))))
pylab.hold(False)
pylab.draw()
pol1_re = read_snaps(snap_depth)
pol1_re = pol1_re[0::(dec_rate/8)]
time.sleep(2)
#cic1_data, hb_data, cic2_data = read_cic_snaps(fpga, dec_rate, snap_depth)
#pylab.figure()
#pylab.subplot(221)
#pylab.semilogy(abs(pylab.fftshift(fft(cic1_data[0:1024]))))
#pylab.title('FFT of the output of CIC_1')
#pylab.subplot(222)
def correction_light(I, method, show_light, mask=None):
"""Corrige la derive eclairement
:I: array_like ou iplimage
:method: 'polynomial' or 'frequency'
:show_light: option affiche correction (true|false)
:mask: array de zone non interet
:returns: iplimage 32bit
"""
from progress import *
import Tkinter
if type(I) == cv.iplimage:
if I.nChannels == 3:
if method == 'None':
I = RGB2L(I)
I = cv2array(I)[:, :, 0]
I = pymorph.hmin(I, 15, pymorph.sedisk(3))
I = array2cv(I)
cv.EqualizeHist(I, I)
return I
I = RGB2L(I)
I_32bit = cv.CreateImage(cv.GetSize(I), cv.IPL_DEPTH_32F, 1)
cv.ConvertScale(I, I_32bit, 3000.0, 0.0)
I = cv.CloneImage(I_32bit)
I = cv2array(I)[:, :, 0]
elif len(I.shape) == 3:
I = (I[:, :, 0] + I[:, :, 0] + I[:, :, 0])\
/ 3.0 # A modifier: non utiliser dans notre cas
elif method == 'None':
I = array2cv(I)
cv.EqualizeHist(I, I)
return I
I = np.log(I + 10 ** (-6))
(H, W) = np.shape(I)
I_out = I * 0 + 10 ** (-6)
if method == 'polynomial':
## I = M.A avec A coeff. du polynome
I_flat = I.flatten()
degree = 3
print("modification degree 3")
#degree du polynome
nb_coeff = (degree + 1) * (degree + 2) / 2 # nombre coefficient
[yy, xx] = np.meshgrid(np.arange(W, dtype=np.float64),
np.arange(H, dtype=np.float64))
if mask is not None:
xx[mask] = 0
yy[mask] = 0
# Creation de M
try:
M = np.zeros((H * W, nb_coeff), dtype=np.float64)
except MemoryError:
print MemoryError
return MemoryError
i, j = 0, 0 # i,j degree de x,y
#Bar progression
bar = Tkinter.Tk(className='Correcting Light...')
m = Meter(bar, relief='ridge', bd=3)
m.pack(fill='x')
m.set(0.0, 'Starting correction...')
for col in np.arange(nb_coeff):
M[:, col] = (xx.flatten() ** i) * (yy.flatten() ** j)
i += 1
m.set(0.5 * float(col) / (nb_coeff - 1))
if i + j == degree + 1:
i = 0
j += 1
# Resolution au sens des moindres carree: pseudo-inverse
try:
M = pl.pinv(M)
A = np.dot(M, I_flat)
except ValueError:
return ValueError
# Calcul de la surface
i, j = 0, 0
surface = np.zeros((H, W), dtype=np.float64)
for cmpt in np.arange(nb_coeff):
surface += A[cmpt] * (xx ** i) * (yy ** j) # forme quadratique
i += 1
m.set(0.5 + 0.5 * float(cmpt) / (nb_coeff - 1))
if i + j == degree + 1:
i = 0
j += 1
bar.destroy()
I_out = np.exp(I / surface)
light = surface
elif method == 'frequency':
Rx, Ry = 2, 2
# zero padding
N = [H, W]
filtre = np.zeros((N[1], N[0]))
centre_x = round(N[0] / 2)
centre_y = round(N[1] / 2)
print("FFT2D...")
I_fourier = pl.fftshift(pl.fft2(I, N))
# Gaussian filter
[xx, yy] = np.meshgrid(np.arange(N[0], dtype=np.float),
np.arange(N[1], dtype=np.float))
filtre = np.exp(-2 * ((xx - centre_x) ** 2 + (yy - centre_y) ** 2) /
(Rx ** 2 + Ry ** 2))
filtre = pl.transpose(filtre)
I_fourier = I_fourier * filtre
print("IFFT2D...")
I_out = (np.abs(pl.ifft2(pl.ifftshift(I_fourier), N)))[0:H, 0:W]
light = I_out
I_out = np.exp(I / I_out)
else:
light = I * 0
I_out = I
# Display Light
if show_light:
light = ((light - light.min()) * 3000.0 /
light.max()).astype('float32')
light = array2cv(light)
fig = pl.figure()
pl.imshow(light)
fig.show()
I_out = (I_out - I_out.min()) * 3000.0 / I_out.max()
I_out = I_out.astype('uint8')
#chapeau haut de forme
I_out = pymorph.hmin(I_out, 25, pymorph.sedisk(3))
#Conversion en iplimage et ajustement contraste
gr = array2cv(I_out)
cv.EqualizeHist(gr, gr)
return gr
MyPi = 3.1416
xReal = cos(2.0 * MyPi * f0MHz * T / fsMHz)
xRealmul = cos(2.0 * MyPi * f0MHz * T / fsMHz) * cos(
2.0 * MyPi * f0MHzmul * T / fsMHz)
xComplex = exp(1j * 2.0 * MyPi * f0MHz * T / fsMHz)
xComplexneg = exp(-1j * 2.0 * MyPi * f0MHz * T / fsMHz)
xRealF = (1.0 / N) * fft(xReal, N)
xRealFmul = (1.0 / N) * fft(xRealmul, N)
xComplexF = (1.0 / N) * fft(xComplex, N)
xComplexFneg = (1.0 / N) * fft(xComplexneg, N)
Tplot = arange(-N / 2.0, N / 2.0, 1)
subplot(5, 1, 1)
plot(Tplot * fsMHz / N, (fftshift(abs(xRealF))))
subplot(5, 1, 2)
plot(Tplot * fsMHz / N, (fftshift(abs(xComplexF))))
subplot(5, 1, 3)
plot(Tplot * fsMHz / N, (fftshift(abs(xComplexFneg))))
subplot(5, 1, 4)
plot(Tplot * fsMHz / N, (fftshift(abs(xRealFmul))))
show()
f = open('output.txt', 'w')
file_output.comple_w(f, xReal, 'xReal')
file_output.comple_w(f, xComplex, 'xComplex')
file_output.comple_w(f, xRealF, 'xRealF')
file_output.comple_w(f, xComplexF, 'xComplexF')
f.close()
def handler(self, msg):
# get input
x = pmt.to_python(pmt.cdr(msg))
meta = pmt.car(msg);
samples = pmt.cdr(msg);
# pass data
self.curve_data[0] = (numpy.linspace(1,len(x),len(x)), 10*numpy.log10(numpy.abs(pylab.fftshift(numpy.fft.fft(x)))));
# trigger update
self.emit(QtCore.SIGNAL("updatePlot(int)"), 0)
