240726 sift特征点检测

# -*- coding: utf-8 -*-
 import sysimport cv2
 import numpy as np# 加载数据
 input_file = 'table.jpg' #sys.argv[1]
 img = cv2.imread(input_file)
 img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
 # 提取关键点
 sift = cv2.xfeatures2d.SIFT_create()
 keypoints = sift.detect(img_gray, None)
 # 画出特征点
 img_sift = np.copy(img)
 cv2.drawKeypoints(img, keypoints, img_sift, flags=cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)
 # 展示
 cv2.imshow('Input image', img)
 cv2.imshow('SIFT features', img_sift)
 cv2.waitKey()