使用Python，OpenCV进行涂鸦（绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头~）

概述使用Python，OpenCV进行涂鸦（绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头）1.效果图2.原理2.1绘制线：cv2.line(canvas,(300,0),(0,300),(255,0,255),3)2.2绘制矩形：cv2.rectangle(canvas,(200,50),(225,125),(0,0,255),-1)2.3绘制圆：cv2.ci

使用Python，OpenCV进行涂鸦（绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头）1. 效果图2. 原理2.1 绘制线：cv2.line(canvas, (300, 0), (0, 300), (255, 0, 255), 3)2.2 绘制矩形：cv2.rectangle(canvas, (200, 50), (225, 125), (0, 0, 255), -1)2.3 绘制圆：cv2.circle(canvas, (200, 50), 5, (255, 0, 0), -1)2.4 绘制椭圆：cv2.ellipse(canvas, (200, 200), (150, 100), -60, 0, 300, (255, 0, 0), -1)2.5 绘制文字：cv2.putText(canvas, "Beautiful", (30, 100), cv2.FONT_HERSHEY_PLAIN, 2, (0, 0, 255), 1)2.6 NumPy的随机数功能：np.random.randint3. 源码参考

这篇博客将介绍使用Python，OpenCV绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头。

1. 效果图

线效果图如下：

矩形效果图如下：

圆效果图靶子如下：

随机圆心、颜色、半径效果图如下：

椭圆效果图如下：

绘制文字效果图如下：

绘制多边形轮廓，多边形填充效果图如下：

随机颜色，起终点箭头效果图如下：

2. 原理2.1 绘制线：cv2.line(canvas, (300, 0), (0, 300), (255, 0, 255), 3)image 画布pt1 起点pt2 终点color 颜色thickness 线的宽度2.2 绘制矩形：cv2.rectangle(canvas, (200, 50), (225, 125), (0, 0, 255), -1)canvas 要绘制的画布pt1 起始点坐标pt2 终止点坐标color 外轮廓线的颜色thickness 画笔的厚度，负数：填充，整数，轮廓线的宽度2.3 绘制圆：cv2.circle(canvas, (200, 50), 5, (255, 0, 0), -1)image 画布center 圆心坐标radius 半径color 颜色thickness 正数：线条宽度，负数: 填充区域2.4 绘制椭圆：cv2.ellipse(canvas, (200, 200), (150, 100), -60, 0, 300, (255, 0, 0), -1)img 图像(int(cX), int(cY)) 中心(150,100) 长轴、短轴angle 旋转角度，负的逆时针旋转，正的顺时针旋转；start_angle 开始角度end_angle 结束角度color 颜色thickness 负数填充，正数线条粗细2.5 绘制文字：cv2.putText(canvas, “Beautiful”, (30, 100), cv2.Font_HERShey_PLAIN, 2, (0, 0, 255), 1)img 图片“Good job” 文字内容(int(cX - 10), int(cY)) 绘制起始的像素cv2.Font_HERShey_SIMPLEX0.45 基于字体特定基大小的比例因子(0, 255, 0) 颜色2 绘制文本的线条粗细2.6 NumPy的随机数功能：np.random.randint

随机生成1个数（5，200之间)：radius = np.random.randint(5, high=200)
随机生成3个数（0，256之间）color = np.random.randint(0, high=256, size=(3,)).toList()

3. 源码

# 绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头# USAGE# python basic_drawing.py# 导入必要的包import numpy as npimport cv2# 初始化空数组图像并绘制# 初始化画布(300*300)的3通道canvas = np.zeros((300, 300, 3), dtype="uint8")# 绘制文字# - img 图片# - "Good job" 文字内容# - (int(cX - 10), int(cY)) 绘制起始的像素# - cv2.Font_HERShey_SIMPLEX# - 0.45 基于字体特定基大小的比例因子# - (0, 255, 0) 颜色# - 2 绘制文本的线条粗细cv2.putText(canvas, "Beautiful", (30, 100), cv2.Font_HERShey_PLAIN, 2, (0, 0, 255), 1)cv2.putText(canvas, "Excellent", (50, 150), cv2.Font_HERShey_DUPLEX, 0.5, (255, 0, 0), 2)cv2.putText(canvas, "Good job", (150, 200), cv2.Font_HERShey_SIMPLEX, 1, (0, 255, 0), 5)cv2.putText(canvas, "Marvelously", (20, 250), cv2.Font_HERShey_SIMPLEX, 1.5, (0, 255, 255), 3)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 初始化空数组图像并绘制# 初始化画布(300*300)的3通道canvas = np.zeros((300, 300, 3), dtype="uint8")# 从左上到右下绘制一条绿色的线green = (0, 255, 0)cv2.line(canvas, (0, 0), (300, 300), green)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 从右上到左下绘制一条宽度为3像素的红色线red = (0, 0, 255)# 绘制线# --image 画布# --pt1 起点# --pt2 终点# --color 颜色# --thickness 线的宽度cv2.line(canvas, (300, 0), (0, 300), red, 3)cv2.imshow("Canvas", canvas)cv2.waitKey(0)cv2.line(canvas, (50, 100), (300, 250), (0, 255, 255), 2, cv2.liNE_8, 3)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 绘制一个50*50的绿色矩形（从(10,10)到(60*60)canvas = np.zeros((300, 300, 3), dtype="uint8")cv2.rectangle(canvas, (10, 10), (60, 60), green)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 绘制另一个宽度为像素的红色矩形，从(50,200）到（200，225)cv2.rectangle(canvas, (50, 200), (200, 225), red, 5)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 绘制一个蓝色填充的矩形blue = (255, 0, 0)# --canvas 要绘制的画布# --pt1 起始点坐标# --pt2 终止点坐标# --color 外轮廓线的颜色# --thickness 画笔的厚度，负数：填充，整数，轮廓线的宽度cv2.rectangle(canvas, (200, 50), (225, 125), blue, -1)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 重新初始化一块画布，计算画布的中心canvas = np.zeros((300, 300, 3), dtype="uint8")print(canvas.shape[1] / 2, canvas.shape[0] / 2)print(canvas.shape[1] // 2, canvas.shape[0] // 2)print((int)(canvas.shape[1] / 2), (int)(canvas.shape[0] / 2))(centerX, centerY) = (canvas.shape[1] // 2, canvas.shape[0] // 2)white = (255, 255, 255)# 遍历不同的圆半径，绘制多个圆for r in range(0, 175, 25):    # 绘制白色圆    cv2.circle(canvas, (centerX, centerY), r, white)# 展示画布最终效果cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 重新初始化一块画布canvas = np.zeros((300, 300, 3), dtype="uint8")# 随机绘制25个圆for i in range(0, 25):    # 随机生成5~200的半径    # 随机生成颜色    # 随机取一个点作为圆心    radius = np.random.randint(5, high=200)    color = np.random.randint(0, high=256, size=(3,)).toList()    pt = np.random.randint(0, high=300, size=(2,))    # 绘制圆在画布上，用填充色    # --image 画布    # --center 圆心坐标    # --radius 半径    # --color 颜色    # --thickness 正数：线条宽度，负数: 填充区域    cv2.circle(canvas, tuple(pt), radius, color, -1)# 展示杰作到屏幕cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 重新初始化一块画布canvas = np.zeros((400, 400, 3), dtype="uint8")# 绘制椭圆# - img 图像# - (int(cX), int(cY)) 中心# - (150,100) 长轴，短轴# - angle 旋转角度，负的逆时针旋转，正的顺时针旋转；# - start_angle 开始角度# - end_angle 结束角度# - (90,90,90) 颜色# - -1 负数：填充，正数：线条粗细cv2.ellipse(canvas, (250, 200), (150, 100), -60, 0, 300, (233, 0, 233), -1)cv2.ellipse(canvas, (100, 100), (80, 40), 0, 0, 280, (255, 255, 0), 2)cv2.ellipse(canvas, (80, 300), (60, 30), 90, 30, 360, (0, 255, 255), 4)cv2.imshow("Canvas", canvas)cv2.waitKey(0)# 重新初始化一块画布canvas = np.zeros((400, 400, 3), dtype="uint8")pts = np.random.randint(50, 300, size=((8, 2)))print(pts.shape)print(pts)# 绘制多边形的轮廓cv2.polylines(canvas, [pts], isClosed=True, color=(255, 0, 255), thickness=1)cv2.imshow("polylines", canvas)cv2.waitKey(0)# 绘制多边形填充cv2.fillpoly(canvas, [pts], color=(255, 255, 0))cv2.imshow("fillpoly", canvas)cv2.waitKey(0)# 重新初始化一块画布canvas = np.zeros((400, 400, 3), dtype="uint8")# 绘制箭头cv2.arrowedline(canvas, (300, 100), (250, 300), (0, 233, 220), 3)for i in range(6):    color = np.random.randint(0, high=256, size=(3,)).toList()    pt = np.random.randint(0, high=300, size=(2,))    pt2 = np.random.randint(0, high=300, size=(2,))    cv2.arrowedline(canvas, tuple(pt), tuple(pt2), color, 3)cv2.imshow("arrowedline", canvas)cv2.waitKey(0)cv2.destroyAllwindows()

参考https://www.pyimagesearch.com/2021/01/27/drawing-with-opencv/ 总结

以上是内存溢出为你收集整理的使用Python，OpenCV进行涂鸦（绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头~）全部内容，希望文章能够帮你解决使用Python，OpenCV进行涂鸦（绘制文字、线、圆、矩形、椭圆、多边形轮廓、多边形填充、箭头~）所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。