检测图像中的椭圆 并求其长短轴...

运行环境 BCB 6.0~  需要OPENCV 库支持

 

  

 

 

 

 

CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* contours;
CvBox2D s;
char string1[22];
char string2[22];
IplImage* img = cvLoadImage( "Ellipse.jpg" );
IplImage* gray = cvCreateImage(cvGetSize(img), 8, 1 );
IplImage* gray1 = cvCreateImage(cvGetSize(img), 8, 1 );
cvCvtColor(img, gray, CV_BGR2GRAY );
cvThreshold( gray, gray1 ,30, 255, CV_THRESH_BINARY );

//图像二值化（这里按需要进行修改，椭圆应为高灰度值）
cvNamedWindow( "Ellipse", 1 );
cvShowImage("Ellipse",gray1);
cvSaveImage("Ellipse11.jpg",gray1);

cvFindContours( gray1, storage, &contours, sizeof(CvContour),
                CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));
  s=cvFitEllipse2(contours);
  s.angle=90-s.angle;//这个地方是OPENCV的一个BUG 角度要修正一下
//cvEllipse( img, cvPointFrom32f( s.center ),cvSize(s.size.width,s.size.height), s.angle,0, 360, CV_RGB(0,0,255), 1, 8, 0 );
cvEllipseBox(img,s, CV_RGB(0,0,255),3, 8 , 0 );//画椭圆框

cvNamedWindow( "Ellipse22", 1 );
cvShowImage("Ellipse22",img);//原图上显示椭圆框

cvSaveImage("Ellipse22.jpg",img);
itoa(s.size.width, string1, 10 );
itoa(s.size.height, string2, 10 );
strcat(string1,", ");
strcat(string1,string2);
ShowMessage( AnsiString(" 椭圆的长短轴分别为:")  + string1 + AnsiString(" 像素 "));





此程序只能检测一个椭圆，如果要检测多个椭圆，要做如下修改~







CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* contours;
CvBox2D s;
char string1[22];
char string2[22];
char string3[22];
char string4[222];
IplImage* img = cvLoadImage( "Ellipse.jpg" );
IplImage* gray = cvCreateImage(cvGetSize(img), 8, 1 );
IplImage* gray1 = cvCreateImage(cvGetSize(img), 8, 1 );
cvCvtColor(img, gray, CV_BGR2GRAY );
cvThreshold( gray, gray1 ,100, 255, CV_THRESH_BINARY );
cvNamedWindow( "Ellipse", 1 );
cvShowImage("Ellipse",gray1);
cvSaveImage("Ellipse11.jpg",gray1);

int i=cvFindContours( gray1, storage, &contours, sizeof(CvContour),
                CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));
itoa(i, string3, 10 );
  for(CvSeq* c=contours; c!=NULL; c=c->h_next)
  {
  s=cvFitEllipse2(c);
  s.angle=90-s.angle;
  cvEllipseBox(img,s, CV_RGB(255,0,0),2, 8 , 0 );//画椭圆框
  itoa(s.size.width, string1, 10 );
  itoa(s.size.height, string2, 10 );
  strcat(string1,"  ");
  strcat(string1,string2);
  strcat(string4,string1);
  strcat(string4," | ");
  }

cvNamedWindow( "Ellipse22", 1 );
cvShowImage("Ellipse22",img);//原图上显示椭圆框

cvSaveImage("Ellipse22.jpg",img);

ShowMessage( AnsiString(" 共找到椭圆 ")  + string3 + AnsiString(" 个/n ")+
AnsiString("椭圆的长短轴分别为:")  + string4 + AnsiString("像素 "));