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

#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;
}