Oriented FAST and Rotated BRIEF (ORB)

So, now we have arrived at the best combination out of all the combinations that we have discussed so far. This algorithm came out of the OpenCV Labs. It's fast, robust, and open source! The SIFT and SURF algorithms are both patented and you can't use them for commercial purposes; this is why ORB is good in many ways.

If you run the ORB keypoint extractor on one of the images shown earlier, you will see something like the following:

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Here is the code:

import cv2 
import numpy as np 

input_image = cv2.imread('images/fishing_house.jpg') 
gray_image = cv2.cvtColor(input_image, cv2.COLOR_BGR2GRAY) 

# Initiate ORB object, before opencv 3.0.0 use cv2.ORB()
orb = cv2.ORB_create() 

# find the keypoints with ORB 
keypoints = orb.detect(gray_image, None) 

# compute the descriptors with ORB 
keypoints, descriptors = orb.compute(gray_image, keypoints) 

# draw only the location of the keypoints without size or orientation 
cv2.drawKeypoints(input_image, keypoints...