本文例項為大家分享了OpenCV實現最小外接正矩形的具體程式碼，供大家參考，具體內容如下

#include "stdafx.h" 
#include "cv.h"
#include "highgui.h" 
#include "cxcore.h"
#include "math.h" 
#include <iostream.h>
int main(int argc,char* argv[])
 
{  
 
 IplImage *src; 
 IplImage *dst;
 IplImage *ROI;
 CvMemStorage* storage=cvCreateMemStorage(0); 
 CvSeq* contour=0; 
 src=cvLoadImage("I:\\test.jpg",0);
 cvNamedWindow("image0",1);
 cvShowImage("image0",src);
 
 int  hei=src->height;
 int wid=src->width; 
 uchar *data;
 data=(uchar*)src->imageData;
 int widstep=src->widthStep;
 int channel=src->nChannels;
 dst=cvCreateImage(cvSize(wid,hei),IPL_DEPTH_8U,3);
 ROI=cvCreateImage(cvSize(wid,3);
 
 for (int i=0;i<hei;i++)
 
 {
 
   for(int j=0;j<wid;j++)
 
   {
 
    if (data[i*widstep+j*channel]>120)
 
    {
 
      data[i*widstep+j*channel]=0;
 
    }
 
    else
 
    {
 
      data[i*widstep+j*channel]=255;
 
    }
 
   }
 
 }
 
 cvNamedWindow("image",0); 
 cvShowImage("image",src); 
 printf("影象的高為：%d,寬為：%d\n\n",hei,wid); 
 cvCvtColor(src,dst,CV_GRAY2BGR);;
cvFindContours(src,storage,&contour,sizeof(CvContour),CV_RETR_CCOMP,CV_CHAIN_APPROX_SIMPLE); 
 for(;contour!=0;contour=contour->h_next) 
 
 {
 
   double length =cvArcLength(contour); 
   double area =fabs(cvContourArea(contour)); 
   CvRect rect = cvBoundingRect(contour,1); 
   cout<<"Length="<<length<<"  Area="<<area<<endl;  
   CvPoint p1;
   CvPoint p2; 
   p1.x=rect.x; 
   p1.y=rect.y;
   p2.x=rect.x+rect.width;
   p2.y=rect.y+rect.height;
   cout<<"p1=("<<p1.x<<","<<p1.y<<")";
   cout<<"p2=("<<p2.x<<","<<p2.y<<")"<<endl;
   cvRectangle(dst,p1,p2,CV_RGB(255,0),1,8,0); 
 
 }
 
   cvNamedWindow("dst",1); 
   cvShowImage("dst",dst);
   cvWaitKey(0);
 
 return 0; 
 
}

原圖：

二值化反色圖：

最小正矩形圖：

最小正矩形資訊：

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。