opencv库

主要介绍直线、矩形框、椭圆和字体注释。

import numpy as np
import cv2
 
# Create a black image
img=np.zeros((512,512,3), np.uint8)
#直线
cv2.line(img,(0,0),(511,511),(255,0,0),5)
#矩形
cv2.rectangle(img,(384,0),(510,128),(0,255,0),3)
#圆形
cv2.circle(img,(447,63), 63, (0,0,255), -1)
#椭圆
cv2.ellipse(img,(256,256),(100,50),0,0,180,255,-1)
#多边形
pts=np.array([[10,5],[20,30],[70,20],[50,10]], np.int32)
pts=pts.reshape((-1,1,2))
cv2.polylines(img,[pts],True,(0,255,255))
#添加文字
cv2.putText(img,'OpenCV',(10,500), cv2.FONT_HERSHEY_SIMPLEX, 4,(255,255,255),2)
cv2.imshow('image',img)
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