{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "6b98a089-5b10-48b3-a62d-703a45c92290",
   "metadata": {},
   "source": [
    "# Background Subtraction"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "d45a3370-5107-4034-9222-0239b4d4585d",
   "metadata": {},
   "outputs": [],
   "source": [
    "import cv2\n",
    "\n",
    "backSub = cv2.createBackgroundSubtractorMOG2()\n",
    "#backSub = cv2.createBackgroundSubtractorKNN()\n",
    "\n",
    "capture = cv2.VideoCapture('videos/vtest.avi')\n",
    "\n",
    "while True:\n",
    "    ret, frame = capture.read()\n",
    "    if frame is None:\n",
    "        break\n",
    "    \n",
    "    fgMask = backSub.apply(frame)\n",
    "    \n",
    "    \n",
    "    cv2.rectangle(frame, (10, 2), (100,20), (255,255,255), -1)\n",
    "    cv2.putText(frame, str(capture.get(cv2.CAP_PROP_POS_FRAMES)), (15, 15),\n",
    "               cv2.FONT_HERSHEY_SIMPLEX, 0.5 , (0,0,0))\n",
    "    \n",
    "    \n",
    "    cv2.imshow('Frame', frame)\n",
    "    cv2.imshow('FG Mask', fgMask)\n",
    "    \n",
    "    keyboard = cv2.waitKey(30)\n",
    "    if keyboard == 'q' or keyboard == 27:\n",
    "        break\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "156bd64d-d61b-4c50-b1ad-9d0beb656545",
   "metadata": {},
   "source": [
    "<div style=\"direction:rtl;text-align:right;font-family:B Lotus, B Nazanin, Tahoma\">اعمال عملیات مرفولوژی روی نتیجه \n",
    "</div>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "0b42165e-6361-4746-84bc-bdc22e50c4e7",
   "metadata": {},
   "outputs": [],
   "source": [
    "import cv2\n",
    "import numpy as np\n",
    "\n",
    "backSub = cv2.createBackgroundSubtractorMOG2()\n",
    "#backSub = cv2.createBackgroundSubtractorKNN()\n",
    "\n",
    "capture = cv2.VideoCapture('videos/vtest.avi')\n",
    "\n",
    "while True:\n",
    "    ret, frame = capture.read()\n",
    "    if frame is None:\n",
    "        break\n",
    "    \n",
    "    fgMask = backSub.apply(frame)\n",
    "    \n",
    "    kernel = np.ones((5,5), np.uint8)\n",
    "\n",
    "    fgMask = cv2.erode(fgMask, kernel, iterations=2)\n",
    "    fgMask = cv2.dilate(fgMask, kernel, iterations=2)\n",
    "    fgMask[np.abs(fgMask) < 250] = 0\n",
    "  \n",
    "    \n",
    "    cv2.rectangle(frame, (10, 2), (100,20), (255,255,255), -1)\n",
    "    cv2.putText(frame, str(capture.get(cv2.CAP_PROP_POS_FRAMES)), (15, 15),\n",
    "               cv2.FONT_HERSHEY_SIMPLEX, 0.5 , (0,0,0))\n",
    "    \n",
    "    \n",
    "    cv2.imshow('Frame', frame)\n",
    "    cv2.imshow('FG Mask', fgMask)\n",
    "    \n",
    "    keyboard = cv2.waitKey(30)\n",
    "    if keyboard == 'q' or keyboard == 27:\n",
    "        break\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "85cdc42b-0241-425e-88b9-64d892d16487",
   "metadata": {},
   "source": [
    "<div style=\"direction:rtl;text-align:right;font-family:B Lotus, B Nazanin, Tahoma\">نتیجه روی وبکم \n",
    "</div>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "0b19f173-a967-4601-a825-a0fc4235bd9c",
   "metadata": {},
   "outputs": [],
   "source": [
    "import cv2\n",
    "\n",
    "backSub = cv2.createBackgroundSubtractorMOG2()\n",
    "#backSub = cv2.createBackgroundSubtractorKNN()\n",
    "\n",
    "capture = cv2.VideoCapture(0)\n",
    "\n",
    "while True:\n",
    "    ret, frame = capture.read()\n",
    "    if frame is None:\n",
    "        break\n",
    "    \n",
    "    fgMask = backSub.apply(frame)\n",
    "    \n",
    "    cv2.imshow('Frame', frame)\n",
    "    cv2.imshow('FG Mask', fgMask)\n",
    "    \n",
    "    keyboard = cv2.waitKey(30)\n",
    "    if keyboard == 'q' or keyboard == 27:\n",
    "        break\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "419d5946-ab88-4d97-b7eb-17dc3f7712f5",
   "metadata": {},
   "source": [
    "https://docs.opencv.org/4.x/d1/dc5/tutorial_background_subtraction.html"
   ]
  }
 ],
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