clean_bg.py

    # Clean the background noise, if color != black, then set to white.
    for y in xrange(img.size[1]):
        for x in xrange(img.size[0]):
            if not(pixdata[x, y][0] > threshold \
            and pixdata[x, y][1] > threshold \
            and pixdata[x, y][2] > threshold):
                pixdata[x, y] = (0, 0, 0, 255)
            else:
                pixdata[x, y] = (255, 255, 255, 255)

    counter = 0;
    old_x = -1;

    letterlist = []