目录
1、画线
代码：
import numpy as np
import cv2 as cv
#create a black image
img=np.zeros((512,512,3),np.uint8)
#draw a diagnoal blue line with thickness of 5 px
cv.line(img,(0,0),(511,511),(255,0,0),5)
cv.imshow("line",img)
cv.waitKey()效果图：(代码中矩形应该为(512,250),才能对应下面的图)
说明：以下的图背景都是一样的，都是一个512x512的边框，背景为黑色。
2、画矩形
代码：
import numpy as np
import cv2 as cv
#create a black image
img=np.zeros((512,512,3),np.uint8)
#draw rectangle
cv.rectangle(img,(384,0),(510,128),(0,255,0),3)
cv.imshow("rectangle",img)
cv.waitKey()效果图：
3、画圆
代码：
import numpy as np
import cv2 as cv
#create a black image
img=np.zeros((512,512,3),np.uint8)
#draw circle
cv.circle(img,(447,63),63,(0,0,255),-1)
cv.imshow("circle",img)
cv.waitKey()效果图：
4、画一个椭圆
代码：
import numpy as np
import cv2 as cv
#create a black image
img=np.zeros((512,512,3),np.uint8)
#draw ellipse
cv.ellipse(img,(256,256),(100,50),0,0,360,255,-1)
cv.imshow("text",img)
cv.waitKey()效果图：
5、在图片上添加文字
代码：
import numpy as np
import cv2 as cv
#create a black image
img=np.zeros((512,512,3),np.uint8)
#在图片上添加文字
font=cv.FONT_HERSHEY_SIMPLEX
cv.putText(img,"OpenCV",(10,500),font,1,(255,255,255),2)
cv.imshow("text",img)
cv.waitKey()效果图：
6、汇总图
代码：
import numpy as np
import cv2 as cv
#create a black image
img=np.zeros((512,512,3),np.uint8)
#draw a diagnoal blue line with thickness of 5 px
cv.line(img,(0,0),(511,511),(255,0,0),5)
#
#cv.imshow("line",img)
#draw rectangle
cv.rectangle(img,(384,0),(510,128),(0,255,0),3)
#draw circle
cv.circle(img,(447,63),63,(0,0,255),-1)
#draw ellipse
cv.ellipse(img,(256,256),(100,50),0,0,360,255,-1)
#在图片上添加文字
font=cv.FONT_HERSHEY_SIMPLEX
cv.putText(img,"OpenCV",(10,500),font,1,(255,255,255),2)
#cv.imshow("text",img)
windowName='example'
cv.namedWindow(windowName)
cv.imshow(windowName,img)
cv.waitKey(0)
效果图：
简单吧QAQ