OpenCV画轮廓的外界圆矩形椭圆等

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#include <cv.h>   #include <cxcore.h>   #include <highgui.h>   #include <iostream>   using namespace std; #pragma   comment(lib,"cv.lib")  #pragma   comment(lib,"highgui.lib")  #pragma   comment(lib,"cxcore.lib")     int main()  {      IplImage *src = cvLoadImage("D:\\三值canny的图.bmp",0);//IplImage *src = cvLoadImage("D:\\BoardStereoL3.jpg",0);    CvMemStorage *storage = cvCreateMemStorage(); //创建一个内存区域,该区域是额可以动态增长的     CvSeq *seq = NULL;  //定义一个序列,这些序列可以存放在上面的内存区域里    int cnt = cvFindContours(src,storage,&seq,sizeof(CvContour),2);// // //默认:mode=CV_RETR_LIST,检索所偶轮廓    seq = seq->v_next;  int c=seq->total;//当前轮廓包含多少个元素,这里的元素为点    double length = cvArcLength(seq); //得到指定的那个轮廓的周长//该函数有3个参数:序列,起点(默认计算整条曲线),是否封闭曲线    double area = cvContourArea(seq);  //得到指定的那个轮廓的面积    CvRect rect = cvBoundingRect(seq,1);  //根据序列,返回轮廓外围矩形;    CvBox2D box = cvMinAreaRect2(seq,NULL); //最小外围矩形           cout<<"Length = "<<length<<endl;      cout<<"Area = "<<area<<endl;      CvPoint pt1,pt2;pt1.x=rect.x;pt1.y=rect.y;pt2.x=rect.x+rect.width;pt2.y=rect.y+rect.height;    IplImage *dst = cvCreateImage(cvGetSize(src),8,3); //目标图像为3通道图cvZero(dst);      cvDrawContours(dst,seq,CV_RGB(255,0,0),CV_RGB(255,0,0),0);      cvRectangle(dst,pt1,pt2,CV_RGB(0,255,0)); cvNamedWindow("dst",1);    cvShowImage("dst",dst);      cvWaitKey();        CvPoint2D32f center;      float radius;    int a=  cvMinEnclosingCircle(seq,¢er,&radius); //根据序列画出最小面积外接圆  cout<<"center.x = "<<center.x<<endl;    cout<<"center.y = "<<center.y<<endl;     cout<<"radius = "<<radius<<endl;   //圆必须是包含所有点,成功返回1,并且得到圆心和半径  cvCircle(dst,cvPointFrom32f(center),cvRound(radius),CV_RGB(100,100,100));      cvShowImage("dst",dst);      cvWaitKey();        CvBox2D ellipse = cvFitEllipse2(seq);//最小二乘法的椭圆拟合      cvEllipseBox(dst,ellipse,CV_RGB(255,255,0)); //在图上画椭圆     cvShowImage("dst",dst);      cvWaitKey();        //绘制外接最小矩形       CvPoint2D32f pt[4];      cvBoxPoints(box,pt);      for(int i = 0;i<4;++i){          cvLine(dst,cvPointFrom32f(pt[i]),cvPointFrom32f(pt[((i+1)%4)?(i+1):0]),CV_RGB(0,0,255));      }      cvShowImage("dst",dst);      cvWaitKey();        cvReleaseImage(&src);      cvReleaseImage(&dst);      cvReleaseMemStorage(&storage);    }  

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