error: (-215:Assertion failed) size.width>0 && size.height>0 in function ‘cv::imshow‘ inshow错误
importcv2ascvimg=cv.imread("a.jpg")cv.namedWindow("inputimage",cv.WINDOW_AUTOSIZE)cv.imshow("inputimage",img)cv.waitKey(0)cv.destroyAllWindows()运行错误:cv.imshow(“inputimage”,img)cv2.error:OpenCV(4.2.0)D