Flask-OpenCV 视频监控

# -*- coding: utf-8 -*-
"""
Spyder Editor

This is a temporary script file.
"""
from flask import Flask, render_template, Response
import cv2

app = Flask(__name__)

class VideoCamera(object):
    def __init__(self):
        # 通过opencv获取实时视频流
        self.video = cv2.VideoCapture(0) 
    
    def __del__(self):
        self.video.release()
    
    def get_frame(self):
        success, image = self.video.read()
        # 因为opencv读取的图片并非jpeg格式，因此要用motion JPEG模式需要先将图片转码成jpg格式图片
        ret, jpeg = cv2.imencode('.jpg', image)
        return jpeg.tobytes()


@app.route('/')  # 主页
def index():
    # jinja2模板，具体格式保存在index.html文件中
    return render_template('index.html')


def gen(camera):
    while True:
        frame = camera.get_frame()
        # 使用generator函数输出视频流， 每次请求输出的content类型是image/jpeg
        yield (b'--frame\r\n'
               b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n\r\n')


@app.route('/video_feed')  # 这个地址返回视频流响应
def video_feed():
    return Response(gen(VideoCamera()), mimetype='multipart/x-mixed-replace; boundary=frame') 

if __name__ == "__main__":
    app.run(port = 8099)
    pass

  
    
  
  
    
Video Streaming Demonstration