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

Here is a simple bit of code I did for uni fairly recently. It captures the image from a camera and displays the detected keypoints on the output image in real-time. I hope it is of use to you.

There is some documentation here.

Code:

import cv2

#Create object to read images from camera 0
cam = cv2.VideoCapture(0)

#Initialize SURF object
surf = cv2.SURF(85)

#Set desired radius
rad = 2

while True:
    #Get image from webcam and convert to greyscale
    ret, img = cam.read()
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

    #Detect keypoints and descriptors in greyscale image
    keypoints, descriptors = surf.detect(gray, None, False)

    #Draw a small red circle with the desired radius
    #at the (x, y) location for each feature found
    for kp in keypoints:
        x = int(kp.pt[0])
        y = int(kp.pt[1])
        cv2.circle(img, (x, y), rad, (0, 0, 255))

    #Display colour image with detected features
    cv2.imshow("features", img)

    #Sleep infinite loop for ~10ms
    #Exit if user presses 
    if cv2.waitKey(10) == 27:
        break