Provides ORB: An efficient alternative to SIFT/SURF
kp,des=cv_orb(image,nfeatures,scaleFactor,color,displayimage)
Input image
The maximum number of features to retain
Pyramid decimation ratio, greater than 1. scaleFactor==2 means the classical pyramid, where each Next level has 4x less pixels than the previous, but such a big scale factor will degrade feature matching scores dramatically. On the other hand, too close to 1 scale factor will mean that to cover certain scale Range you will need more pyramid levels And so the speed will suffer.
color of keypoints drawn on Input image
If 1 it will show the keypoints drawn on Input Image Else it doesn Not
Keypoints of Descriptor
Descriptors of Input image
ORB: An efficient alternative to SIFT / SURF
ORB Is basically a fusion of FAST keypoint detector And BRIEF descriptor With many modifications to enhance the performance. First it use FAST to find keypoints, then apply Harris corner measure to find top N points among them. Now For descriptors, ORB use BRIEF descriptors.