dmtxdecode-fakequietzone.py

import sys
from PIL import Image, ImageOps
from pydmtx import DataMatrix

if __name__ == '__main__':
    dmtx_image = Image.open(sys.argv[1])
    dmtx_image.thumbnail((1060, 1500))
    (width, height) = dmtx_image.size
    dmtx_cropped = dmtx_image.crop((0,int(height*(0.667)), width, height))
    dmtx_cropped = ImageOps.expand(dmtx_cropped, 20, "white") #add 20px white border around img as quiet zone
    (cropped_width, cropped_height) = dmtx_cropped.size
    dm_read = DataMatrix(max_count = 1, timeout = 1500) # find max 1 dmtx code, stop after 1.5 secs
    dmtx_code = dm_read.decode (cropped_width, cropped_height, buffer(dmtx_cropped.tostring()))
    if dmtx_code is not None:
        print "Found Datamatrix code '%s' in %s" % (dmtx_code, sys.argv[1])
    else:
        print "No Datamatrix code found in %s" % (sys.argv[1])