python-使用电脑摄像头扫码

import pyzbar.pyzbar as pyzbar
from PIL import Image,ImageEnhance
import cv2
import matplotlib.pyplot as plt
import numpy as np


def decode(input):
    barcodes = pyzbar.decode(input)
    if barcodes==[]:
        pass
    else:            #识别出二维码则退出
        for barcode in barcodes:
            barcodeData = barcode.data.decode("utf-8")
            print(barcodeData)
        return 1

def scan():
    camera = cv2.VideoCapture(0)
    while True:
        # 读取当前帧
        ret, frame = camera.read()
        cv2.imshow("video", frame)
        # 转为灰度图像
        gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

        im = decode(gray)
        key=cv2.waitKey(5)#每一帧图像显示时间，相当于刷新率
        if key == ord('q') or im==1:
            print("process terminte")
            break
    camera.release()
    cv2.destroyAllWindows(
    
if __name__=='__main__':
   scan()