Does anyone have any examples of using OpenCV with python for descriptor extraction?

Question

I\'m trying to use OpenCV to extract SURF descriptors from an image. I\'m using OpenCV 2.4 and Python 2.7, but am struggling to find any documentation that provides any informat

Answer 1

todofixthis I follow your code and I get this

import cv2
img = cv2.imread("im3.jpg")
sd = cv2.FeatureDetector_create("SURF")
surf = cv2.DescriptorExtractor_create("SURF")
keypoints = sd.detect(img) # segmentation faults
l,d = surf.compute(img, keypoints) # returns empty result

where

l = keypoints

d = descriptor