I/O examples with OpenCV

cv2_IO.ipynb

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   "cell_type": "markdown",
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   "source": [
    "## Capture from web cam and write to file"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {
    "collapsed": false
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   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import cv2\n",
    "import platform\n",
    "\n",
    "cap = cv2.VideoCapture(0)\n",
    "\n",
    "# work for linux and mac\n",
    "# Define the codec and create VideoWriter object\n",
    "fourcc = cv2.VideoWriter_fourcc(*'XVID')\n",
    "if platform.system()=='Darwin':\n",
    "    out = cv2.VideoWriter('output.avi',-1, 20.0, (1280,720)) # for mac to select codec\n",
    "else:\n",
    "    out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480)) # for linux\n",
    "\n",
    "\n",
    "while(cap.isOpened()):\n",
    "    ret, frame = cap.read()\n",
    "    if ret==True:\n",
    "#         frame = cv2.flip(frame,0)\n",
    "\n",
    "        # write the flipped frame\n",
    "        out.write(frame)\n",
    "\n",
    "        cv2.imshow('frame',frame)\n",
    "        if cv2.waitKey(1) & 0xFF == ord('q'):\n",
    "            break\n",
    "    else:\n",
    "        break\n",
    "\n",
    "# Release everything if job is finished\n",
    "cap.release()\n",
    "out.release()\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## capture from web cam and display in full screen"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "import cv2\n",
    "import platform\n",
    "\n",
    "cap=cv2.VideoCapture(0)\n",
    "\n",
    "while (True):\n",
    "    \n",
    "    ret,frame=cap.read()\n",
    "    \n",
    "    if platform.system()!=\"Darwin\":\n",
    "        cv2.namedWindow(\"camera\",cv2.WND_PROP_FULLSCREEN)\n",
    "        cv2.setWindowProperty(\"camera\",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN)\n",
    "    cv2.imshow('camera',frame)\n",
    "#     out.write(frame)\n",
    "    \n",
    "    if cv2.waitKey(1) &0xFF == ord('q'):\n",
    "        break\n",
    "\n",
    "        \n",
    "cap.release()\n",
    "# out.release()\n",
    "cv2.destroyAllWindows()\n",
    "    "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# capture from ip cam and display full screen"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "import cv2\n",
    "import platform\n",
    "\n",
    "# cap=cv2.VideoCapture(\"atrium.avi\") # capture from file\n",
    "cap=cv2.VideoCapture(\"http://192.168.0.88/mjpg/video.mjpg\")\n",
    "\n",
    "# fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')\n",
    "# fourcc = cv2.VideoWriter_fourcc(*'XVID')\n",
    "\n",
    "# out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))\n",
    "# out = cv2.VideoWriter('output.avi',-1, 20.0, (640,480))\n",
    "\n",
    "while (True):\n",
    "    \n",
    "    ret,frame=cap.read()\n",
    "\n",
    "    if platform.system()!=\"Darwin\":\n",
    "        cv2.namedWindow(\"camera\",cv2.WND_PROP_FULLSCREEN)\n",
    "        cv2.setWindowProperty(\"camera\",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN)\n",
    "    cv2.imshow('camera',frame)\n",
    "#     out.write(frame)\n",
    "    \n",
    "    if cv2.waitKey(1) &0xFF == ord('q'):\n",
    "        break\n",
    "\n",
    "        \n",
    "cap.release()\n",
    "# out.release()\n",
    "cv2.destroyAllWindows()\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "(720, 1280, 3)"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "frame.shape"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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