本程式實現通過筆記本攝像頭拍照，然後在照片的右下角處加入時間戳的水印，分為2個函式分別實現拍照和加時間戳水印。
以下程式碼在Win7、Python3.6裡除錯通過

__author__ = 'Yue Qingxuan'
# -*- coding: utf-8 -*-
import cv2
import time
import os
from PIL import Image, ImageDraw, ImageFont

def TakePhoto(path):
    cap = cv2.VideoCapture(0)
    while(1):
        # get a frame
        ret, frame = cap.read()
        # show a frame
        cv2.imshow("Capture", frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            timestr=time.strftime('%Y%m%d%H%M%S', time.localtime(time.time()))
            filename=path+'/{0}.jpeg'.format(timestr)   #取當前時間作為照片的檔名
            cv2.imwrite(filename, frame)
            add_watermark(filename)
            break
    cap.release()
    cv2.destroyAllWindows()

def add_watermark(img_file):
    # 建立繪畫物件
    image = Image.open(img_file)
    draw = ImageDraw.Draw(image)
    myfont = ImageFont.truetype('C:/windows/fonts/Arial.ttf',size=20)
    fillcolor = '#ff0000'   #RGB紅色
    timestr=time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))  #格式化時間
    width,height = image.size
    # 引數一：位置（x軸，y軸）；引數二：填寫內容；引數三：字型；引數四：顏色
    #draw.text((width-80, 5),'100',font=myfont,fill=fillcolor)
    draw.text((width - 200, height-35), timestr, font=myfont, fill=fillcolor)
    image.save(img_file)


if __name__ == '__main__':
    path="E:/OpencvVideo"
    if os.path.exists(path)==False:
        os.makedirs(path)  #如果不存在就新建一個目錄
    TakePhoto(path)