OPENCV连通域分析，画连通域的外接矩形程序示例

void bwareaopen(IplImage* img, IplImage* pimg, int size) {                    //此函数的功能
 CvMemStorage *storage;
 CvSeq *contour;
 IplImage *inputimg;
 double area;
 
 if(!img || !size) {
  return;
 }
 
 inputimg = cvCloneImage(img);
 cvThreshold(inputimg, inputimg, 10, 255, CV_THRESH_BINARY);
 storage = cvCreateMemStorage(0);
 
 cvFindContours(inputimg, storage, &contour, sizeof(CvContour),
  CV_RETR_EXTERNAL  , CV_CHAIN_APPROX_SIMPLE, cvPoint(0, 0));
 
 while(contour) {
  /*area = cvContourArea(contour, CV_WHOLE_SEQ);*/
  area = fabs(cvContourArea( contour, CV_WHOLE_SEQ )); //获取当前轮廓面积
  printf("area == %lf\n", area);
  //画轮廓
  //画外接矩形
  CvRect r = ((CvContour*)contour)->rect;
  if (r.height * r.width > size)
  {
   cvRectangle(pimg, cvPoint(r.x, r.y), cvPoint(r.x + r.width, r.y + r.height),CV_RGB(255, 0, 0), 1, CV_AA, 0);
 

  }
  contour = contour->h_next;
  
 }
 
 cvReleaseMemStorage(&storage);
 cvReleaseImage(&inputimg);
 //cvDestroyWindow("temp");
 
 return;
}