Opencv绘制最小外接矩形、最小外接圆

RotatedRect minAreaRect( InputArray points ); 

void minEnclosingCircle( InputArray points, 
          CV_OUT Point2f& center, CV_OUT float& radius ); 

#include "core/core.hpp" 
#include "highgui/highgui.hpp" 
#include "imgproc/imgproc.hpp" 
#include "iostream" 
 
using namespace std; 
using namespace cv; 
 
int main(int argc,char *argv[]) 
{ 
 Mat imageSource=imread(argv[1],0); 
 imshow("Source Image",imageSource); 
 Mat image; 
 blur(imageSource,image,Size(3,3)); 
 threshold(image,image,0,255,CV_THRESH_OTSU);  
 imshow("Threshold Image",image); 
 
 //寻找最外层轮廓 
 vector<vector<Point>> contours; 
 vector<Vec4i> hierarchy; 
 findContours(image,contours,hierarchy,RETR_EXTERNAL,CHAIN_APPROX_NONE,Point()); 
 
 Mat imageContours=Mat::zeros(image.size(),CV_8UC1); //最小外接矩形画布 
 Mat imageContours1=Mat::zeros(image.size(),CV_8UC1); //最小外结圆画布 
 for(int i=0;i<contours.size();i++) 
 {   
  //绘制轮廓 
  drawContours(imageContours,contours,i,Scalar(255),1,8,hierarchy); 
  drawContours(imageContours1,contours,i,Scalar(255),1,8,hierarchy); 
 
 
  //绘制轮廓的最小外结矩形 
  RotatedRect rect=minAreaRect(contours[i]); 
  Point2f P[4]; 
  rect.points(P); 
  for(int j=0;j<=3;j++) 
  { 
   line(imageContours,P[j],P[(j+1)%4],Scalar(255),2); 
  } 
 
  //绘制轮廓的最小外结圆 
  Point2f center; float radius; 
  minEnclosingCircle(contours[i],center,radius); 
  circle(imageContours1,center,radius,Scalar(255),2); 
 
 } 
 imshow("MinAreaRect",imageContours);  
 imshow("MinAreaCircle",imageContours1); 
 waitKey(0); 
 return 0;