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#!/usr/local/bin/python2.7.3 -tttt
import numpy
import matplotlib.pyplot as plt
import random

crosssection=numpy.zeros((521, 521), dtype=complex)+1
position=numpy.random.randint(20,355, size=(2, 10))
for i in range(10):
    crosssection[position[0, i]-20:position[0, i]+20,position[1, i]-15:position[1, i]+15]=random.randint(1,10)
plt.subplot(3,2,1)
plt.imshow(numpy.absolute(crosssection),cmap=plt.cm.gray)
imgfft=numpy.fft.fft2(crosssection)
imgfft=numpy.fft.fftshift(imgfft)
plt.subplot(3,2,2)
plt.imshow(numpy.log10(numpy.absolute(imgfft)+1),cmap=plt.cm.gray)
noise=numpy.sin(numpy.arange(521*521,dtype=complex)*numpy.pi/10).reshape((521,521))*4
crosssection=crosssection+noise
plt.subplot(3,2,3)
plt.imshow(numpy.absolute(crosssection),cmap=plt.cm.gray)
imgfft=numpy.fft.fft2(crosssection)
imgfft=numpy.fft.fftshift(imgfft)
plt.subplot(3,2,4)
plt.imshow(numpy.log10(numpy.absolute(imgfft)+1),cmap=plt.cm.gray)
imgphase=numpy.angle(imgfft)
imgintensity=numpy.absolute(imgfft)
imgintensity[:,233:235]=imgintensity[:,230:232]
imgintensity[:,285:287]=imgintensity[:,288:290]
imgintensity[233:235,:]=imgintensity[230:232,:]
imgintensity[288:290,:]=imgintensity[288:290,:]
imgfftcal=numpy.multiply(numpy.absolute(imgintensity), numpy.exp(1j*imgphase))
plt.subplot(3,2,6)
plt.imshow(numpy.log10(numpy.absolute(imgfftcal)+1),cmap=plt.cm.gray)
imgcal=numpy.fft.fft2(imgfftcal)
plt.subplot(3,2,5)
plt.imshow(numpy.absolute(imgcal),cmap=plt.cm.gray)
plt.show()
2Â¥2014-10-30 20:23:05
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