opencv+python 在图像上写文字

...
    cnt = 0
    font = cv2.FONT_HERSHEY_SIMPLEX
    for n in temp3_value:
        print(n)
        x = int(n['x'])
        y = int(n['y'])
        point = (x,y)
        cv2.circle(img, point, 1, (0,0,255), 4)
        cv2.putText(img, str(cnt), point, font, 0.5, (255, 255, 255), 1)
        cnt = cnt + 1
...

cv2.putText(img, str(cnt), point, font, 0.5, (255, 255, 255), 1)
参数分别为：原图，文字，文字坐标，字体，字体大小，字体颜色，字体粗细