(41)Air Band OpenCV2.4.13_为轮廓创建包围盒与圆

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本文是对OpenCV2.4.13文档的部分翻译，作个人学习之用，并不完整。

#include "opencv2/highgui/highgui.hpp"#include "opencv2/imgproc/imgproc.hpp"#include <iostream>#include <stdio.h>#include <stdlib.h>using namespace cv;using namespace std;Mat src; Mat src_gray;int thresh = 100;int max_thresh = 255;RNG rng(12345);/// Function headervoid thresh_callback(int, void* );/** * @function main */int main(){  /// 载入图像  src = imread( "stuff.jpg", 1 );  /// 将图像转换为灰度图并模糊处理  cvtColor( src, src_gray, COLOR_BGR2GRAY );  blur( src_gray, src_gray, Size(3,3) );  /// 创建窗口  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);}/** * @function thresh_callback */void thresh_callback(int, void* ){  Mat threshold_output;  vector<vector<Point> > contours;  vector<Vec4i> hierarchy;  /// 用阈值检测边缘  threshold( src_gray, threshold_output, thresh, 255, THRESH_BINARY );  /// Find contours  findContours( threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );  /// 逼近多边形轮廓 + 获取环绕的矩形和圆形  vector<vector<Point> > contours_poly( contours.size() );  vector<Rect> boundRect( contours.size() );  vector<Point2f>center( contours.size() );  vector<float>radius( contours.size() );  for( size_t i = 0; i < contours.size(); i++ )     { approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );       boundRect[i] = boundingRect( Mat(contours_poly[i]) );       minEnclosingCircle( contours_poly[i], center[i], radius[i] );     }  /// 画出多边形轮廓 + 廉洁矩形和圆形  Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );  for( size_t i = 0; i< contours.size(); i++ )     {       Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );       drawContours( drawing, contours_poly, (int)i, color, 1, 8, vector<Vec4i>(), 0, Point() );       rectangle( drawing, boundRect[i].tl(), boundRect[i].br(), color, 2, 8, 0 );       circle( drawing, center[i], (int)radius[i], color, 2, 8, 0 );     }  /// 在窗口中显示  namedWindow( "Contours", WINDOW_AUTOSIZE );  imshow( "Contours", drawing );}

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