I have a little image 50x50.
I do something like this (pseudocode):
OrbFeatureDetector.detect(object,kp);
//> kp.size() is about 50 keypoints
OrbFeatureExtractor.compute(object,kp,kpDesc);
//> Now kp.size() == 0
This mean that after I have called .compute the method has deleted all keypoints.
The Image I am using is this:
I believe this is some sort of bug. Someone can confirm? I am using OpenCV 2.4.5