python opencv3 向图像里写字

git：https://github.com/linyi0604/Computer-Vision

 # coding:utf-8

 import cv2

 img = cv2.imread("../data/mm1.jpg", cv2.IMREAD_GRAYSCALE)

 img = cv2.putText(img, "hello world!", (50, 50), cv2.FONT_HERSHEY_SIMPLEX, 1.2, (0, 255, 0), 2)
 """
 cv2.putText(图像, 文字, (x, y), 字体, 大小, (b, g, r), 宽度)
 """

 cv2.imshow("", img)
 cv2.waitKey()
 cv2.destroyAllWindows()