使用OpenCV进行特征向量计算

import cv2
import numpy as np

image = cv2.imread('image.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

sift = cv2.SIFT_create()
keypoints, descriptors = sift.detectAndCompute(gray, None)

k = 128
descriptors = descriptors.astype(np.float32)
codes, dist = cv2.kmeans(descriptors, k, None, (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 10, 1.0), 10, cv2.KMEANS_RANDOM_CENTERS)

mean = np.mean(codes, axis=0)
stddev = np.std(codes, axis=0)