Python实例：通过摄像头实时识别一维条形码

1#coding:utf-8
2'''
3通过摄像头识别一维条形码
4'''
5
6import cv2
7from pyzbar.pyzbar import decode
8
9# results = decode(cv2.imread('datas/images/barcode-3.jpg'))
10# for result in results:
11#     print('barcode = %s'% str(result.data))
12
13cap = cv2.VideoCapture(0)
14if not cap.isOpened():
15    print('cannot open camera 0')
16    exit(0)
17
18while True:
19    ret,frame = cap.read()
20    if not ret:
21        print('cannot grab frame from camera')
22        continue
23    results = decode(frame)
24    for result in results:
25        print('barcode = %s' % result.data)
26        barcode_roi = frame[result.rect.left:result.rect.width,result.rect.top:result.rect.height]
27        cv2.imshow('barcode:%s' % result.data,barcode_roi)
28
29    cv2.imshow('camera',frame)
30    key = cv2.waitKey(10)
31    if key == 27:
32        break
33
34cv2.destroyAllWindows()