Lecture 3.15 - Mini Project # 1 - Live Sketch Using Webcam.ipynb

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    "## Mini Project # 1 - Live Sketch Using Webcam"
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    "import cv2\n",
    "import numpy as np\n",
    "\n",
    "# Our sketch generating function\n",
    "def sketch(image):\n",
    "    # Convert image to grayscale\n",
    "    img_gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)\n",
    "    \n",
    "    # Clean up image using Guassian Blur\n",
    "    img_gray_blur = cv2.GaussianBlur(img_gray, (5,5), 0)\n",
    "    \n",
    "    # Extract edges\n",
    "    canny_edges = cv2.Canny(img_gray_blur, 10, 70)\n",
    "    \n",
    "    # Do an invert binarize the image \n",
    "    ret, mask = cv2.threshold(canny_edges, 70, 255, cv2.THRESH_BINARY_INV)\n",
    "    return mask\n",
    "\n",
    "\n",
    "# Initialize webcam, cap is the object provided by VideoCapture\n",
    "# It contains a boolean indicating if it was sucessful (ret)\n",
    "# It also contains the images collected from the webcam (frame)\n",
    "cap = cv2.VideoCapture(0)\n",
    "\n",
    "while True:\n",
    "    ret, frame = cap.read()\n",
    "    cv2.imshow('Our Live Sketcher', sketch(frame))\n",
    "    if cv2.waitKey(1) == 13: #13 is the Enter Key\n",
    "        break\n",
    "        \n",
    "# Release camera and close windows\n",
    "cap.release()\n",
    "cv2.destroyAllWindows()      "
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