opencv 增强现实（一）：特征点检测

 import cv2 as cv
 import numpy as np

 def draw_keypoints(img, keypoints):
     for kp in keypoints:
         x, y = kp.pt
         cv.circle(img, (int(x), int(y)), 2, (0, 255, 0))

 img = cv.imread('D:/image/AR/moon.png')
 gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
 # 启动orb探测器
 detector = cv.ORB_create()

 kp, des = detector.detectAndCompute(gray, None)
 draw_keypoints(img=img, keypoints=kp)
 cv.imshow('moon', img)
 cv.waitKey(0)

之前用cv.drawKeypoints()报错，好像是版本问题，自定义一个函数来替换

https://github.com/skvark/opencv-python/issues/168

效果：