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代码如下:
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include <iostream>
using namespace std;
int main()
{
IplImage *src = cvLoadImage("f:\\images\\test2.bmp",CV_LOAD_IMAGE_GRAYSCALE);
CvMemStorage *storage = cvCreateMemStorage();
CvSeq *seq = NULL;
int cnt = cvFindContours(src,storage,&seq);
seq = seq->h_next;
double length = cvArcLength(seq);
double area = cvContourArea(seq);
CvRect rect = cvBoundingRect(seq,1);
CvBox2D box = cvMinAreaRect2(seq,NULL);
cout<<"Length = "<<length<<endl;
cout<<"Area = "<<area<<endl;
IplImage *dst = cvCreateImage(cvGetSize(src),8,3); cvZero(dst);
cvDrawContours(dst,seq,CV_RGB(255,0,0),CV_RGB(255,0,0),0);
cvRectangleR(dst,rect,CV_RGB(0,255,0));
cvShowImage("dst",dst);
cvWaitKey();
CvPoint2D32f center;
float radius;
cvMinEnclosingCircle(seq,er,&radius);
cvCircle(dst,cvPointFrom32f(center),cvRound(radius),CV_RGB(100,100,100));
cvShowImage("dst",dst);
cvWaitKey();
CvBox2D ellipse = cvFitEllipse2(seq);
cvEllipseBox(dst,ellipse,CV_RGB(255,255,0));
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);
}
输入图像 为bmp格式(自己用纯黑画的，已经是二值了)，
如果用我下面的图片直接另存为，则就先载入图像，然后灰度化，再二值化
结果：
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转播
