OpenCV3 - OpenCV的绘图函数

代码

cv.line(), cv.circle() , cv.rectangle(), cv.ellipse(), cv.putText()

如上所有的函数, 都使用如下相似的参数

• img: 你想绘制图形的图片
• color: 图形的颜色, 如果是RGB, 使用tuple, 例如蓝色(255,0,0), 如果是灰度, 直接使用灰度值
• thickness: 线条的粗细
• lineType: 线条的类型(8连接线, 锯齿线, ... ), 默认是8连接线, cv.LINE_AA是锯齿线条

绘制直线

import numpy as np
import cv2 as cv
# Create a black image
img = np.zeros((512,512,3), np.uint8)
# Draw a diagonal blue line with thickness of 5 px
cv.line(img,(0,0),(511,511),(255,0,0),5)

绘制方形

cv.rectangle(img,(384,0),(510,128),(0,255,0),3)

绘制圆形

cv.circle(img,(447,63), 63, (0,0,255), -1)

绘制椭圆

cv.ellipse(img,(256,256),(100,50),0,0,180,255,-1)

绘制多边形

pts = np.array([[10,5],[20,30],[70,20],[50,10]], np.int32)
pts = pts.reshape((-1,1,2))
cv.polylines(img,[pts],True,(0,255,255))

添加文字

font = cv.FONT_HERSHEY_SIMPLEX
cv.putText(img,'OpenCV',(10,500), font, 4,(255,255,255),2,cv.LINE_AA)

参考文件

Drawing Functions in OpenCV

转自: http://www.gcsjj.cn/articles/2019/04/02/1554136848113.html