#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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