OpenCV画轮廓的外界圆矩形椭圆等

OpenCV画轮廓的外界圆矩形椭圆等

分类： OpenCV 2013-05-31 15:51 996人阅读 评论(0) 收藏 举报

#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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