OpenCV添加文字

import numpy as np
import cv2
img = np.zeros((512,512,3),np.uint8)
font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(img,'OpenCV',(50,200),font,3,(0,255,255),cv2.LINE_AA)
winname = 'example'
cv2.namedWindow(winname)
cv2.imshow(winname,img)
cv2.waitKey(0)
cv2.destoryWindow(winname)