OpenCV学习笔记3

import numpy as np
import cv2
img = np.zeros((512,512,3),np.uint8)
pts = np.array([[10,5],[50,10],[70,20],[20,30]])
print(pts)
pts = pts.reshape((-1,1,2))
print(pts)
cv2.polylines(img,[pts],True,(0,255,255))
winname = 'example'
cv2.namedWindow(winname)
cv2.imshow(winname,img)
cv2.waitKey(0)
cv2.destoryWindow(winname)