29 lines
701 B
Python
29 lines
701 B
Python
import numpy as np
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from scipy import misc
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import matplotlib.pyplot as plt
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from util.io import readvalue
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def positive_int(s):
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i = int(s)
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if(i <= 0):
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raise ValueError("{} is negative".format(i))
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return i
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file_input_name = readvalue("Input file name > ", str)
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file_output_name = readvalue("Output file name > ", str)
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cutoff = readvalue("Frequencies to cut > ", positive_int)
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fin = misc.imread(file_input_name, flatten=True)
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transformed = np.fft.fft2(fin)
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new_transformed = np.zeros(transformed.shape, dtype=np.complex)
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new_transformed[cutoff:-cutoff, cutoff:-cutoff] = transformed[cutoff:-cutoff, cutoff:-cutoff]
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new = np.fft.ifft2(new_transformed).real
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misc.imsave(file_output_name, new)
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