OpenCV实现最小外接正矩形

本文实例为大家分享了OpenCV实现最小外接正矩形的具体代码，供大家参考，具体内容如下

#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,hei),IPL_DEPTH_8U,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("图像的高为：%d,宽为：%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(255,0,0),1,8,0); 

 }

   cvNamedWindow("dst",1);
   cvShowImage("dst",dst);
   cvWaitKey(0);

 return 0; 

}

原图：

二值化反色图：

最小正矩形图：

最小正矩形信息：

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