Lecture 19 Object Detection using Contours.ipynb

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    "import cv2\n",
    "import numpy as np"
   ]
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    "def nothing(x):\n",
    "    pass\n",
    "\n",
    "cv2.namedWindow(\"window\")\n",
    "cv2.createTrackbar(\"th\", \"window\", 0, 255, nothing)\n",
    "\n",
    "cv2.createTrackbar(\"lb\", \"window\", 0, 255, nothing)\n",
    "cv2.createTrackbar(\"lg\", \"window\", 0, 255, nothing)\n",
    "cv2.createTrackbar(\"lr\", \"window\", 0, 255, nothing)\n",
    "\n",
    "cv2.createTrackbar(\"hb\", \"window\", 255, 255, nothing)\n",
    "cv2.createTrackbar(\"hg\", \"window\", 255, 255, nothing)\n",
    "cv2.createTrackbar(\"hr\", \"window\", 255, 255, nothing)\n",
    "\n",
    "\n",
    "cap = cv2.VideoCapture(0)\n",
    "\n",
    "while cap.isOpened():\n",
    "    r, frame = cap.read()\n",
    "    if r == True:\n",
    "        \n",
    "        thr = cv2.getTrackbarPos(\"th\", \"window\")\n",
    "        \n",
    "        LB = cv2.getTrackbarPos(\"lb\", \"window\")\n",
    "        LG = cv2.getTrackbarPos(\"lg\", \"window\")\n",
    "        LR = cv2.getTrackbarPos(\"lr\", \"window\")\n",
    "        \n",
    "        \n",
    "        HB = cv2.getTrackbarPos(\"hb\", \"window\")\n",
    "        HG = cv2.getTrackbarPos(\"hg\", \"window\")\n",
    "        HR = cv2.getTrackbarPos(\"hr\", \"window\")\n",
    "        \n",
    "        \n",
    "        lower = np.array([LB, LG, LR])\n",
    "        upper = np.array([HB, HG, HR])\n",
    "        \n",
    "        \n",
    "        frame = cv2.flip(frame, 1)\n",
    "        frame = cv2.resize(frame, (400,400))\n",
    "        hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)\n",
    "        m = cv2.inRange(hsv, lower, upper)\n",
    "        res = cv2.bitwise_and(frame, frame, mask = m)\n",
    "        fr = cv2.bitwise_not(res)\n",
    "        \n",
    "        _, thresh = cv2.threshold(m, thr, 255, cv2.THRESH_BINARY)\n",
    "        cnt,hr = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)\n",
    "        \n",
    "        cv2.drawContours(frame, cnt, -1, (255,0,0), 2)\n",
    "        \n",
    "        \n",
    "        cv2.imshow(\"thr\", thresh)\n",
    "        cv2.imshow(\"Res\", res)\n",
    "        cv2.imshow(\"mask\", m)\n",
    "        cv2.imshow(\"rooshan\", frame)\n",
    "        if cv2.waitKey(25) & 0xff == ord(\"p\"):\n",
    "            break\n",
    "    \n",
    "    else:\n",
    "        break\n",
    "\n",
    "\n",
    "\n",
    "cap.release()\n",
    "cv2.destroyAllWindows()"
   ]
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