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- #!/usr/bin/python
- import numpy as np
- import matplotlib.image as mpimg
- import wave
- from array import array
-
-
- def make_wav(image_filename):
- """ Make a WAV file having a spectrogram resembling an image """
- # Load image
- image = mpimg.imread(image_filename)
- image = np.sum(image, axis = 2).T[:, ::-1]
- image = image**3 # ???
- w, h = image.shape
-
- # Fourier transform, normalize, remove DC bias
- data = np.fft.irfft(image, h*2, axis=1).reshape((w*h*2))
- data -= np.average(data)
- data *= (2**15-1.)/np.amax(data)
- data = array("h", np.int_(data)).tostring()
-
- # Write to disk
- output_file = wave.open(image_filename+".wav", "w")
- output_file.setparams((1, 2, 44100, 0, "NONE", "not compressed"))
- output_file.writeframes(data)
- output_file.close()
- print "Wrote %s.wav" % image_filename
-
-
- if __name__ == "__main__":
- import sys
- make_wav(sys.argv[1])
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