opencv 增强现实（二）：特征点匹配

 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))

 # 两张键盘图片，用于特征匹配
 img1 = cv.imread('../images/keyboard1.jpg')
 img2 = cv.imread('../images/keyboard2.jpg')
 gray1 = cv.cvtColor(img1, cv.COLOR_BGR2GRAY)
 gray2 = cv.cvtColor(img2, cv.COLOR_BGR2GRAY)
 orb = cv.ORB_create()
 kp1, des1 = orb.detectAndCompute(gray1, None)  # 计算特征点和描述符
 kp2, des2 = orb.detectAndCompute(gray2, None)
 bf = cv.BFMatcher(cv.NORM_HAMMING, crossCheck=True)  # 建立匹配关系
 matches = bf.match(des1, des2)  # 匹配描述符
 matches = sorted(matches, key=lambda x:x.distance)  # 根据距离来排序
 # img3 = cv.drawMatches(gray1, kp1, gray2, kp2, matches[:10], gray2, flags=2)
 img3 = cv.drawMatches(img1, kp1, img2, kp2, matches[:10], img2, flags=2)
 cv.imshow('img3', img3)
 cv.waitKey(0)
 cv.destroyAllWindows()

效果：

本来还想看看SIFT和SURF的效果，但是模块没有了，也有说安装opencv-contrib-python的，但是安装后好像还要操作一下，也没写清楚

参考链接：

OpenCV+Python特征提取算法与图像描述符之SIFT / SURF / ORB

安装opencv-contrib-python

OpenCV探索之路（二十三）：特征检测和特征匹配方法汇总