02_althimeticOperationsOnImage.ipynb

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   "source": [
    "## Althimetic operations on images"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "#import required modeules\n",
    "import cv2\n",
    "import numpy as np\n",
    "import matplotlib.pyplot as plt"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### image addition"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "img1 = cv2.imread('paris.jpg')\n",
    "img2 = cv2.imread('eifel.jpg')\n",
    "\n",
    "dst = cv2.addWeighted(img1,0.7,img1,0.3,0)\n",
    "\n",
    "cv2.imshow('dst',dst)\n",
    "cv2.waitKey(0)\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Bitwise operation"
   ]
  },
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   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Load two images\n",
    "img1 = cv2.imread('paris.jpg')\n",
    "img2 = cv2.imread('eifel.jpg')\n",
    "\n",
    "# I want to put logo on top-left corner, So I create a ROI\n",
    "rows,cols,channels = img2.shape\n",
    "roi = img1[0:rows, 0:cols ]\n",
    "\n",
    "# Now create a mask of logo and create its inverse mask also\n",
    "img2gray = cv2.cvtColor(img2,cv2.COLOR_BGR2GRAY)\n",
    "ret, mask = cv2.threshold(img2gray, 10, 255, cv2.THRESH_BINARY)\n",
    "mask_inv = cv2.bitwise_not(mask)\n",
    "\n",
    "# Now black-out the area of logo in ROI\n",
    "img1_bg = cv2.bitwise_and(roi,roi,mask = mask_inv)\n",
    "\n",
    "# Take only region of logo from logo image.\n",
    "img2_fg = cv2.bitwise_and(img2,img2,mask = mask)\n",
    "\n",
    "# Put logo in ROI and modify the main image\n",
    "dst = cv2.add(img1_bg,img2_fg)\n",
    "img1[0:rows, 0:cols ] = dst\n",
    "\n",
    "cv2.imshow('res',img1)\n",
    "cv2.waitKey(0)\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### image blending"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Load two images\n",
    "img1 = cv2.imread('paris.jpg')\n",
    "img2 = cv2.imread('eifel.jpg')\n",
    "# note that the image size has to be equal\n",
    "dst = cv2.addWeighted(img1,0.7,img2,0.3,0)\n",
    "\n",
    "cv2.imshow('dst',dst)\n",
    "cv2.waitKey(0)\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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