【opencv练习35 - 轮廓旋转边界框 + 椭圆】

/*******************************************************    测试程序【轮廓的 旋转边界框 + 椭圆】    时间：2016年9月3日********************************************************/Mat src; Mat src_gray;int thresh = 100;int max_thresh = 255;RNG rng(12345);void thresh_callback(int, void* );int main(void){  src = imread("Image.jpg", 1 );  cvtColor( src, src_gray, COLOR_BGR2GRAY );  blur( src_gray, src_gray, Size(3,3) );  const char* source_window = "Source";  namedWindow( source_window, WINDOW_AUTOSIZE );  imshow( source_window, src );  createTrackbar( " Threshold:", "Source", &thresh, max_thresh, thresh_callback );  thresh_callback( 0, 0 );  waitKey(0);  return(0);}void thresh_callback(int, void* ){  Mat threshold_output;  vector<vector<Point> > contours;      //【轮廓】点的数组 的数组(二维数组)  vector<Vec4i> hierarchy;                //【1、阈值 + find轮廓】  threshold( src_gray, threshold_output, thresh, 255, THRESH_BINARY );  //【threshold_output——>contours】  findContours( threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );  //【2、查找每个轮廓的 旋转矩形，椭圆】   vector<RotatedRect> minRect( contours.size() );  vector<RotatedRect> minEllipse( contours.size() );  for( size_t i = 0; i < contours.size(); i++ )     {         minRect[i] = minAreaRect( Mat(contours[i]) );   //【contours ————> minRect】             if( contours[i].size() > 5 )                     //  contours点数 > 5         {             minEllipse[i] = fitEllipse( Mat(contours[i]) );//【contours ————> minEllipse】        }     }  //【3、绘制】  Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );  for( size_t i = 0; i< contours.size(); i++ )     {        // 随机色彩       Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );       //【轮廓】contour       drawContours( drawing, contours, (int)i, color, 1, 8, vector<Vec4i>(), 0, Point() );       //【椭圆】 ellipse       ellipse( drawing, minEllipse[i], color, 2, 8 );       //【旋转矩形】rotated rectangle       Point2f rect_points[4];        minRect[i].points( rect_points );       for( int j = 0; j < 4; j++ )          line( drawing, rect_points[j], rect_points[(j+1)%4], color, 1, 8 );     }  namedWindow( "Contours", WINDOW_AUTOSIZE );  imshow( "Contours", drawing );}![这里写图片描述](http://img.blog.csdn.net/20160909082508142)