proof-of-concept.ipynb

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    "from os import fsencode, listdir, fsdecode\n",
    "from PIL import Image, ImageDraw\n",
    "\n",
    "directory = fsencode('input')\n",
    "for file in listdir(directory):\n",
    "    filename = fsdecode(file)\n",
    "    if filename.endswith('.jpg') or filename.endswith('.tif'):\n",
    "        # print('Filename {}'.format(filename))\n",
    "        img = Image.open('input/' + filename)\n",
    "        w, h = img.size\n",
    "        # img.show()\n",
    "        # With all of this set we can crop about 10% from bottom to delete rulers\n",
    "        crop_mult_y = 0.9\n",
    "        # There are 2 base types of scans, detect which are we dealing with\n",
    "        # One type should have characteristic blue (2, 143, 199) at about 4% width\n",
    "        # (63, 133, 167) seems to be another variation of it\n",
    "        # Coming diagonally we should always hit it\n",
    "        is_transparent_ruler_type = True\n",
    "        for i in range(0, 500):\n",
    "            sample = img.getpixel((i, i))\n",
    "            # print(sample)\n",
    "            if (0 <= sample[0] <= 5 or 57 <= sample[0] <= 64) and 128 <= sample[1] <= 150 and 165 <= sample[2] <= 210:\n",
    "                is_transparent_ruler_type = False\n",
    "                break\n",
    "        # print(is_transparent_ruler_type)\n",
    "        if is_transparent_ruler_type:\n",
    "            crop_mult_x = 0.07\n",
    "        else:\n",
    "            crop_mult_x = 0.11\n",
    "        img = img.crop((w * crop_mult_x, 0, w, h * crop_mult_y))\n",
    "        w, h = img.size\n",
    "        # img.show()\n",
    "        # Sample 10 pixels from where there should always be solid background\n",
    "        samples = 0\n",
    "        for i in range(1000, 1030):\n",
    "            samples += sum(img.getpixel((i, 50))) / 3\n",
    "        sample_average = samples / 30\n",
    "        # print('Sample average is {}'.format(sample_average))\n",
    "        center_x = int(w / 2)\n",
    "        center_y = int(h / 2)\n",
    "        \n",
    "        upper_edge_y = None\n",
    "        for i in range(0, h):\n",
    "            average_pixel_rgb = sum(img.getpixel((center_x, i))) / 3\n",
    "            # print (average_pixel_rgb)\n",
    "            if not (sample_average * 0.96 < average_pixel_rgb < sample_average * 1.04):\n",
    "                # We have likely hit the upper edge of the real image\n",
    "                # draw = ImageDraw.Draw(img)\n",
    "                # draw.line((0, i, w, i), fill=128)\n",
    "                # img.show()\n",
    "                upper_edge_y = i\n",
    "                break\n",
    "    \n",
    "        lower_edge_y = None\n",
    "        for i in range(h - 1, 0, -1):\n",
    "            average_pixel_rgb = sum(img.getpixel((center_x, i))) / 3\n",
    "            # print (average_pixel_rgb)\n",
    "            if not (sample_average * 0.95 < average_pixel_rgb < sample_average * 1.05):\n",
    "                # We have likely hit the lower edge of the real image\n",
    "                # draw = ImageDraw.Draw(img)\n",
    "                # draw.line((0, i, w, i), fill=128)\n",
    "                # img.show()\n",
    "                lower_edge_y = i\n",
    "                break\n",
    "    \n",
    "        right_edge_x = None\n",
    "        for i in range(w - 1, 0, -1):\n",
    "            average_pixel_rgb = sum(img.getpixel((i, center_y))) / 3\n",
    "            # print (average_pixel_rgb)\n",
    "            if not (sample_average * 0.95 < average_pixel_rgb < sample_average * 1.05):\n",
    "                # We have likely hit the right edge of the real image\n",
    "                # draw = ImageDraw.Draw(img)\n",
    "                # draw.line((i, 0, i, h), fill=128)\n",
    "                # img.show()\n",
    "                right_edge_x = i\n",
    "                break\n",
    "                \n",
    "        left_edge_x = None\n",
    "        for i in range(0, w):\n",
    "            average_pixel_rgb = sum(img.getpixel((i, center_y))) / 3\n",
    "            # print (average_pixel_rgb)\n",
    "            if not (sample_average * 0.95 < average_pixel_rgb < sample_average * 1.05):\n",
    "                # We have likely hit the left edge of the real image\n",
    "                # draw = ImageDraw.Draw(img)\n",
    "                # draw.line((i, 0, i, h), fill=128)\n",
    "                # img.show()\n",
    "                left_edge_x = i\n",
    "                break\n",
    "    \n",
    "        # img.show()\n",
    "        offset = w * 0.01\n",
    "        img = img.crop((left_edge_x - offset, upper_edge_y - offset, right_edge_x + offset, lower_edge_y + offset))\n",
    "        with open('output/' + filename, 'w') as f:\n",
    "            img.save(f)\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "\n"
   ]
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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