{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 86,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 引入影象處理庫OpenCV\n",
    "import cv2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 87,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 選擇影片檔\n",
    "cap = cv2.VideoCapture('data/video/smile.mp4')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 88,
   "metadata": {},
   "outputs": [],
   "source": [
    "while(True):\n",
    "    # 從VideoCapture擷取一張影像\n",
    "    ret, frame = cap.read() \n",
    "    \n",
    "    # 將影像轉換成灰度\n",
    "    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)\n",
    "    \n",
    "    # 顯示圖片\n",
    "    cv2.imshow('frame', gray)\n",
    "    \n",
    "    # 若按下 q 鍵則離開迴圈\n",
    "    if cv2.waitKey(24) & 0xFF == ord('q'):\n",
    "        break"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 89,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 釋放攝影機\n",
    "cap.release()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 90,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 關閉所有 OpenCV 視窗\n",
    "cv2.destroyAllWindows()"
   ]
  }
 ],
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