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;
}