To get range of white.ipynb

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     "text": [
      "[h264 @ 0x2646f40] A non-intra slice in an IDR NAL unit.\n",
      "[h264 @ 0x2646f40] decode_slice_header error\n",
      "[h264 @ 0x2809500] A non-intra slice in an IDR NAL unit.\n",
      "[h264 @ 0x2809500] decode_slice_header error\n"
     ]
    },
    {
     "ename": "error",
     "evalue": "OpenCV(4.6.0) /io/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'\n",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31merror\u001b[0m                                     Traceback (most recent call last)",
      "Cell \u001b[0;32mIn [1], line 21\u001b[0m\n\u001b[1;32m     17\u001b[0m \u001b[38;5;28;01mwhile\u001b[39;00m \u001b[38;5;28;01mTrue\u001b[39;00m:\n\u001b[1;32m     18\u001b[0m     ret, frame \u001b[38;5;241m=\u001b[39m video\u001b[38;5;241m.\u001b[39mread()\n\u001b[0;32m---> 21\u001b[0m     hsv \u001b[38;5;241m=\u001b[39m \u001b[43mcv2\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mcvtColor\u001b[49m\u001b[43m(\u001b[49m\u001b[43mframe\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mcv2\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mCOLOR_BGR2HSV\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m     23\u001b[0m     l_h \u001b[38;5;241m=\u001b[39m cv2\u001b[38;5;241m.\u001b[39mgetTrackbarPos(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mL - H\u001b[39m\u001b[38;5;124m\"\u001b[39m, \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mTrackbars\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n\u001b[1;32m     24\u001b[0m     l_s \u001b[38;5;241m=\u001b[39m cv2\u001b[38;5;241m.\u001b[39mgetTrackbarPos(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mL - S\u001b[39m\u001b[38;5;124m\"\u001b[39m, \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mTrackbars\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n",
      "\u001b[0;31merror\u001b[0m: OpenCV(4.6.0) /io/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'\n"
     ]
    }
   ],
   "source": [
    "import cv2\n",
    "import numpy as np\n",
    "\n",
    "def nothing(x):\n",
    "    pass\n",
    "\n",
    "video = cv2.VideoCapture(\"lane_vgt.mp4\")\n",
    "cv2.namedWindow(\"Trackbars\")\n",
    "\n",
    "cv2.createTrackbar(\"L - H\", \"Trackbars\", 0, 179, nothing)\n",
    "cv2.createTrackbar(\"L - S\", \"Trackbars\", 0, 255, nothing)\n",
    "cv2.createTrackbar(\"L - V\", \"Trackbars\", 0, 255, nothing)\n",
    "cv2.createTrackbar(\"U - H\", \"Trackbars\", 179, 179, nothing)\n",
    "cv2.createTrackbar(\"U - S\", \"Trackbars\", 255, 255, nothing)\n",
    "cv2.createTrackbar(\"U - V\", \"Trackbars\", 255, 255, nothing)\n",
    "\n",
    "while True:\n",
    "    ret, frame = video.read()\n",
    "    \n",
    "    \n",
    "    hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)\n",
    "    \n",
    "    l_h = cv2.getTrackbarPos(\"L - H\", \"Trackbars\")\n",
    "    l_s = cv2.getTrackbarPos(\"L - S\", \"Trackbars\")\n",
    "    l_v = cv2.getTrackbarPos(\"L - V\", \"Trackbars\")\n",
    "    u_h = cv2.getTrackbarPos(\"U - H\", \"Trackbars\")\n",
    "    u_s = cv2.getTrackbarPos(\"U - S\", \"Trackbars\")\n",
    "    u_v = cv2.getTrackbarPos(\"U - V\", \"Trackbars\")\n",
    "    \n",
    "    lower_white= np.array([l_h, l_s, l_v])\n",
    "    upper_white= np.array([u_h, u_s, u_v])\n",
    "    mask = cv2.inRange(hsv, lower_white, upper_white)\n",
    "    \n",
    "    result = cv2.bitwise_and(frame, frame, mask=mask)\n",
    "    \n",
    "    cv2.imshow(\"frame\", frame)\n",
    "    cv2.imshow(\"mask\", mask)\n",
    "    cv2.imshow(\"Results\",result)\n",
    "    \n",
    "    key = cv2.waitKey(1)\n",
    "    if key == 27:\n",
    "        break\n",
    "\n",
    "video.release()\n",
    "cv2.destroyAllWindows()"
   ]
  },
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   "execution_count": null,
   "id": "7fa310a9",
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