OpenCV绘制线、圆、椭圆、矩形

一、概述

　　案例：使用opencv在一张图片上绘制线、圆、椭圆、矩形

二、示例图片

 

 

三、示例代码

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#include <opencv2/opencv.hpp> #include <iostream>   using namespace cv; using namespace std;     int main(int argc, char const *argv[]) {     /* 绘制线、圆、椭圆、矩形 */     Mat src = imread("girl.jpg");     if(!src.data){         cout << "can't not found image"<<endl;         return -1;     }       //绘制线     Point p1 = Point(20,30);     Point p2;     p2.x = 400;     p2.y = 400;     Scalar color(0,0,255);     line(src,p1,p2,color,LINE_8);             //绘制矩形     Rect rect = Rect(200,100,300,300);     Scalar color2 = Scalar(255,0,0);     rectangle(src,rect,color,2,LINE_8);         //绘制椭圆     Scalar color3 = Scalar(0, 255, 0);     ellipse(src, Point(src.cols / 2, src.rows / 2), Size(src.cols / 4, src.rows / 8), 90, 0, 360, color3, 2, LINE_8);       //绘制圆     Scalar color4 = Scalar(0, 255, 255);     Point center = Point(src.cols / 2, src.rows / 2);     circle(src, center, 150, color4, 2, 8);       //填充一个矩形     Point pts[1][5];     pts[0][0] = Point(100, 100);     pts[0][1] = Point(100, 200);     pts[0][2] = Point(200, 200);     pts[0][3] = Point(200, 100);     pts[0][4] = Point(100, 100);     const Point* ppts[] = { pts[0] };     int npt[] = { 5 };     Scalar color5 = Scalar(255, 12, 255);     fillPoly(src, ppts, npt, 1, color5, 8);       //展示图片     imshow("src",src);     waitKey(0);       return 0; }