Sound2Image and Image2Sound

Image2Sound.py

#Encode image to sound
#Requirement : Python 2.5, Numpy, audiolab, PIL
 
import numpy as np
from scikits.audiolab import Format, Sndfile
import math
from PIL import Image
import sys
 
if len(sys.argv)!=2:
    print('Syntax: input_file output_file')
    sys.exit(1)
 
IMG=Image.open(sys.argv[1])
IMGwidth=IMG.size[0]
IMGheight=IMG.size[1]
nframes=IMGheight*IMGwidth
data=np.zeros(nframes)
i=0
for y in range(0, IMGheight):
    for x in range(0, IMGwidth):
        data[i]=IMG.getpixel((x, y))
        i=i+1
 
sndData=(data/255)*2-1
f=Sndfile(sys.argv[2], 'w', format=Format(), channels=1, samplerate=44100) #Samplerate may change but it is usually 44100 Hz
f.write_frames(sndData)
f.close()

Sound2image.py

#Encode sound to image
#Requirement : Python 2.5, Numpy, audiolab, PIL
import numpy as np
from scikits.audiolab import Format, Sndfile
import math
from PIL import Image
import sys
 
if len(sys.argv)!=4:
    print('Syntax: input_file image_width output_file')
    sys.exit(1)
 
f=Sndfile(sys.argv[1], 'r')
data=f.read_frames(f.nframes)
 
#Generate image
IMGwidth=int(sys.argv[2])
IMGheight=math.ceil(f.nframes/IMGwidth)
IMG=Image.new('L', (IMGwidth, IMGheight), 127)
pixels=((data+1)/2)*255
x=0
y=0
for i in range(0, len(pixels)):
    if x>=IMGwidth:
        x=0
        y=y+1
    if y>=IMGheight:
        break
    IMG.putpixel((x, y), int(pixels[i]))
    x=x+1
 
IMG.save(sys.argv[3])