import numpy as np
import cv2
from matplotlib import pyplot as plt

img1 = cv2.imread('/home/niangu/桌面/答题卡识别/test4/webwxgetmsgimg (36).jpeg', cv2.IMREAD_GRAYSCALE)
img2 = cv2.imread('/home/niangu/桌面/答题卡识别/test3/webwxgetmsgimg (27).jpeg', cv2.IMREAD_GRAYSCALE)

orb = cv2.ORB_create()
kp1, des1 = orb.detectAndCompute(img1, None)
kp2, des2 = orb.detectAndCompute(img2, None)
bf = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True)
matches = bf.match(des1, des2)
matches = sorted(matches, key=lambda x:x.distance)
img3 = cv2.drawMatches(img1, kp1, img2, kp2, matches[:40], img2, flags=2)

cv2.namedWindow('keypoints', cv2.WINDOW_NORMAL)
cv2.imshow('keypoints', img3)

cv2.waitKey()&0xff