# how to pass keypoints for orb.computeAsync

Im trying to compute descriptors for the keypoints found, but Im getting segmentation fault error. Part of the problem is that there is very little documentation for opencv cuda in python. I am getting an image data, and using cv2.cuda.createGoodFeaturesToTrack() for getting keypoints. I want to calculate descriptors for the keypoints, and hence using computeAsync(). Here is my code -

def extract(img):
#orb = cv2.cuda_ORB.create()
orb = cv2.ORB_create()
#converting to grey
cuC1 = cv2.cuda_GpuMat()