# How to generate key points by myself

Hi, i want to compute SURF descriptors on my own key points. The problem is, currently I only have 2d image points (x,y-coordinates), but opencv's method for calculating SURF descriptors needs keypoints, which need beside the coordinates additional information like, scale, size, orientation,... (information which I do not have).

Please help -> How can I generate correct Keypoints out of my 2d image points? (Correct means, I want to have key points on exactly the coordinates of my image points).

Thanks in advance Patricia

just curious, what are you trying to do with it ?

I'm trying to train an SVM on these descriptors. The points are image points on a persons face (e.g eyes, mouth...) and to train an svm on this descriptors to later be able to do person identification i need exactly the same points on every training image (which i have) but then also the descriptors on this points. Hope this makes it understanable :-)

yes, sure makes sense !