openCV上的圆圈检测

Question

我正在openCV 2.1和visual studio 2008中编译以下代码，

        int main()
        {
            Mat src, src_gray;

           /// Read the image
          src = cvLoadImageM("Circle_3.jpg",1);

          if( !src.data )
          {
           cout<<"   "<<"Error!!!!!!!!!!"<<endl;
           return -1; 
          }

          /// Convert it to gray
         cvtColor( src, src_gray, CV_BGR2GRAY );

        /// Reduce the noise so we avoid false circle detection
            GaussianBlur( src_gray, src_gray, Size(9, 9), 2, 2 );

           vector<Vec3f> circles;

      /// Apply the Hough Transform to find the circles
             HoughCircles( src_gray, circles, CV_HOUGH_GRADIENT, 1, src_gray.rows/8, 200, 100, 0, 0 );
       /// Draw the circles detected
          for( size_t i = 0; i < circles.size(); i++ )
         {
               Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));
                int radius = cvRound(circles[i][2]);
                        // circle center
             circle( src, center, 3, Scalar(0,255,0), 3, 8, 0 );
               // circle outline
            circle( src, center, radius, Scalar(0,0,255), 3, 8, 0 );

             }

               /// Show your results

            imshow( "Hough Circle Transform Demo", src );

              waitKey(0);
               return 0;

                     }

此代码存在两个问题：                     1.）它没有给出理想的结果（构建正常！）                     2.）它没有多次输入:(

期待指导......