文章目录
- OpenCV绘制直线
- OpenCV绘制矩形和圆
- 画矩形
- 画圆
- OpenCV椭圆的绘制
- OpenCV绘制多边形
- OpenCV绘制文本
- 实现鼠标绘制基本图形
OpenCV绘制直线
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)
# 坐标点为(x, y)
cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
OpenCV绘制矩形和圆
详情参看官方文档
画矩形
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
画圆
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
OpenCV椭圆的绘制
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
# cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)
cv2.circle(img, (320, 240), 100, (0, 255, 0))
cv2.circle(img, (320, 240), 5, (255, 0, 0), -1)# 画椭圆
# 长方形的度若为0则是从右侧x正轴开始的,顺时针旋转
cv2.ellipse(img, (320, 240), (100, 50), 0, 0, 360, (0, 255, 0))cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
# cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)
cv2.circle(img, (320, 240), 100, (0, 255, 0))
cv2.circle(img, (320, 240), 5, (255, 0, 0), -1)# 画椭圆
# 长方形的度若为0则是从右侧x正轴开始的,顺时针旋转
cv2.ellipse(img, (320, 240), (100, 50), 90, 45, 90, (0, 255, 0), -1)cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
# cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)
cv2.circle(img, (320, 240), 100, (0, 255, 0))
cv2.circle(img, (320, 240), 5, (255, 0, 0), -1)# 画椭圆
# 长方形的度若为0则是从右侧x正轴开始的,顺时针旋转
cv2.ellipse(img, (320, 240), (100, 50), 15, 0, 360, (0, 255, 0))cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
OpenCV绘制多边形
点集必须为32位
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
# cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)
# cv2.circle(img, (320, 240), 100, (0, 255, 0))
# cv2.circle(img, (320, 240), 5, (255, 0, 0), -1)# 画椭圆
# 长方形的度若为0则是从右侧x正轴开始的,顺时针旋转
# cv2.ellipse(img, (320, 240), (100, 50), 15, 0, 360, (0, 255, 0))# 画多边形
pts = np.array([(300, 10), (150, 100), (450, 100)], np.int32)
cv2.polylines(img, [pts], True, (0, 255, 0))cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
# cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)
# cv2.circle(img, (320, 240), 100, (0, 255, 0))
# cv2.circle(img, (320, 240), 5, (255, 0, 0), -1)# 画椭圆
# 长方形的度若为0则是从右侧x正轴开始的,顺时针旋转
# cv2.ellipse(img, (320, 240), (100, 50), 15, 0, 360, (0, 255, 0))# 画多边形
pts = np.array([(300, 10), (150, 100), (450, 100)], np.int32)
cv2.polylines(img, [pts], True, (0, 255, 0))# 填充多边形
cv2.fillPoly(img, [pts], (255, 255, 0))cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
OpenCV绘制文本
# -*- coding: utf-8 -*-
import cv2
import numpy as npimg = np.zeros((480, 640, 3), np.uint8)# 画线
# 坐标点为(x, y)
# cv2.line(img, (0, 0), (300, 400), (0, 255, 0), 1, 4)
# cv2.line(img, (100, 0), (400, 600), (255, 0, 0), 5, 16)# 画矩形
# (10, 10)represents the top left corner of rectangle
# (100, 100) represents the bottom right corner of rectangle
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), 5)
# Thickness of -1 will fill the entire shape
# cv2.rectangle(img, (10, 10), (100, 100), (0, 255, 0), -1)# 画圆
# cv2.circle(img, (320, 240), 30, (0, 255, 0), -1)
# cv2.circle(img, (320, 240), 100, (0, 255, 0))
# cv2.circle(img, (320, 240), 5, (255, 0, 0), -1)# 画椭圆
# 长方形的度若为0则是从右侧x正轴开始的,顺时针旋转
# cv2.ellipse(img, (320, 240), (100, 50), 15, 0, 360, (0, 255, 0))# 画多边形
# pts = np.array([(300, 10), (150, 100), (450, 100)], np.int32)
# cv2.polylines(img, [pts], True, (0, 255, 0))# 填充多边形
# cv2.fillPoly(img, [pts], (255, 255, 0))# 绘制文本
cv2.putText(img, "ILoveFS", (10, 400), cv2.FONT_HERSHEY_DUPLEX, 3, (0, 255, 0))cv2.imshow('draw', img)key = cv2.waitKey(0)
if key & 0xff == ord('q'):cv2.destroyAllWindows()
实现鼠标绘制基本图形
# -*- coding: utf-8 -*-
import cv2
import numpy as np# 基本功能:
# 可以通过鼠标进行基本图形的绘制
# 1. 可以画线: 当用户按下l键, 即选择了画线。 此时, 滑动鼠标即可画线。
# 2. 可以画矩形: 当用户按下r键, 即可选择画矩形。 此时, 滑动鼠标即可画矩形。
# 3. 可以画圆: 当用户按下c键,即可选择画圆。 此时, 滑动鼠标即可画圆。# curshape: 0-drawline, 1-drawrectangle, 2-drawcircle# 显示窗口和背景
img = np.zeros((480, 640, 3), np.uint8)curshape = 0
startpos = (0, 0)# 创建窗口
cv2.namedWindow('mouse', cv2.WINDOW_NORMAL)# 鼠标回调函数
def mouse_callback(event, x, y, flags, userdata):global startpos, curshape# print(event, x, y, flags, userdata)if(event & cv2.EVENT_LBUTTONDOWN == cv2.EVENT_LBUTTONDOWN):startpos = (x, y)elif(event & cv2.EVENT_LBUTTONUP == cv2.EVENT_LBUTTONUP):if curshape == 0:cv2.line(img, startpos, (x, y), (0, 255, 0))elif curshape == 1:cv2.rectangle(img, startpos, (x, y), (0, 255, 0))elif curshape == 2:a = (x - startpos[0])b = (y - startpos[1])r = int((a ** 2 + b ** 2) ** 0.5)cv2.circle(img, startpos, r, (0, 0, 255))else:print('error: no shape')# 设置鼠标回调
cv2.setMouseCallback('mouse', mouse_callback, "666")while True:cv2.imshow('mouse', img)key = cv2.waitKey(0) & 0xffif key == ord('q'):breakelif key == ord('l'):curshape = 0elif key == ord('r'):curshape = 1elif key == ord('c'):curshape = 2cv2.destroyAllWindows()
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