"AI" python:opencv--paint function

Brief introduction

Learn to use OPENCV to draw geometry, the main functions are: Cv2.line (), Cv2.circle (), Cv2.rectangle (), Cv2.ellipse (), Cv2.puttext, etc.
Specific explanations can be viewed using Help (Cv2.puttext).

import numpy as npimport cv2#Create a black imageimg = np.zeros((500,500,3),np.uint8)#draw a diagonal blue line with thickness of 5 px#画线:起点，角度，颜色，宽度cv2.line(img,(0,0),(500,500),(255,255,0),15)#画矩阵：左上角，右下角，颜色，宽度cv2.rectangle(img,(350,0),(500,150),(0,255,0),3)#画圆：圆心，半径，颜色， 宽度（负数，-3为向内填充）cv2.circle(img,(425,75),75,(0,0,255),-2)#画椭圆：圆心，长半径和短半径，转动位置角度，转动偏移起始角度，转动偏移结束角度，颜色，宽度cv2.ellipse(img,(250,250),(100,50),90,45,180,255,-1)#画多边形： 以二位矩阵 数据作为坐标连线pts=np.array([[60,5],[200,30],[170,80],[50,90]],np.int32)pts = pts.reshape((-1,1,2))#这里reshape的第一个参数为-1，表明这一维度的长度是根据后面的维度计算出来的cv2.polylines(img,[pts],True,(0,255,255)) #注意第三个参数若是False，我们得到的是不闭合的线#输出文本font = cv2.FONT_HERSHEY_SIMPLEX  cv2.putText(img,‘OpenCV‘,(10,400), font, 2,(255,255,255),3,cv2.LINE_AA)  #为了演示，建窗口显示出来cv2.namedWindow(‘image‘,cv2.WINDOW_NORMAL)cv2.resizeWindow(‘image‘,500,500)#定义frame的大小cv2.imshow(‘image‘,img)cv2.waitKey(3000)cv2.destroyAllWindows()

"AI" python:opencv--paint function