import cv2 as cv

img = cv.imread("/home/wlp/1.jfif")

cv.namedWindow("Image")

cv.imshow("Image", img)

cv.waitKey(0)#等待

cv.destroyAllWindows()

import cv2

import numpy as np

import sys

import time

if len(sys.argv)>1:#判断外部是否 chuan

    inputImage = cv2.imread(sys.argv[1])

else:

    inputImage = cv2.imread("/home/wlp/opcv.png")#提取图片

# Display barcode and QR code location

def display(im, bbox):

    n = len(bbox)

    for j in range(n):

        cv2.line(im, tuple(bbox[j][0]), tuple(bbox[(j + 1) % n][0]), (255, 0, 0), 3)

    # Display results

    cv2.imshow("Results", im)

qrDecoder = cv2.QRCodeDetector()

# Detect and decode the qrcode

data, bbox, rectifiedImage = qrDecoder.detectAndDecode(inputImage)#解码

if len(data) > 0:

    print("Decoded Data : {}".format(data))#格式输出

    display(inputImage, bbox)

    rectifiedImage = np.uint8(rectifiedImage);

    cv2.imshow("Rectified QRCode", rectifiedImage);

else:#输出原图

    print("QR Code not detected")

    cv2.imshow("Results", inputImage)

cv2.waitKey(0)#等待直到用户按下一个按键之后退出

cv2.destroyAllWindows()#关闭窗口

import cv2

import numpy

img1= cv2.imread("/home/wlp/1.jfif")

width=1200

height=800

cv2.namedWindow("img", 0);  # 0w

cv2.resizeWindow("img", int(width * (height - 80) / height), height - 80);

cv2.imshow("img", img1)

cv2.waitKey()