Added harry potter's invisibility cloak code

Made in opencv using numpy

Untitled.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import cv2\n",
+    "import time\n",
+    "import numpy as np\n",
+    "\n",
+    "## Preparation for writing the ouput video\n",
+    "fourcc = cv2.VideoWriter_fourcc(*'XVID')\n",
+    "out = cv2.VideoWriter('output.avi',fourcc,20.0, (640,480))\n",
+    "\n",
+    "##reading from the webcam \n",
+    "cap = cv2.VideoCapture(0)\n",
+    "\n",
+    "## Allow the system to sleep for 3 seconds before the webcam starts\n",
+    "time.sleep(3)\n",
+    "count = 0\n",
+    "background = 0\n",
+    "\n",
+    "## Capture the background in range of 60\n",
+    "for i in range(60):\n",
+    "    ret,background = cap.read()\n",
+    "background = np.flip(background,axis=1)\n",
+    "\n",
+    "\n",
+    "## Read every frame from the webcam, until the camera is open\n",
+    "while(cap.isOpened()):\n",
+    "    ret, img = cap.read()\n",
+    "    if not ret:\n",
+    "        break\n",
+    "    count+=1\n",
+    "    img = np.flip(img,axis=1)\n",
+    "    \n",
+    "    ## Convert the color space from BGR to HSV\n",
+    "    hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)\n",
+    "\n",
+    "    ## Generat masks to detect red color\n",
+    "    lower_red = np.array([0,120,50])\n",
+    "    upper_red = np.array([10,255,255])\n",
+    "    mask1 = cv2.inRange(hsv,lower_red,upper_red)\n",
+    "\n",
+    "    lower_red = np.array([170,120,70])\n",
+    "    upper_red = np.array([180,255,255])\n",
+    "    mask2 = cv2.inRange(hsv,lower_red,upper_red)\n",
+    "\n",
+    "    mask1 = mask1+mask2"
+   ]
+  }
+ ],
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