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how should I use the function orb.detectAndCompute() correctly

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import cv2 as cv imgpath='testImg.jpg' img=cv.imread(imgpath,cv.IMREAD_GRAYSCALE) orb=cv.ORB_create() keypoints,descriptor=orb.detectAndCompute(img,None)> error: (-215) The data should> normally be NULL! in function> NumpyAllocator::allocate

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