(39)Air Band OpenCV_找到图像中的轮廓

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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("HappyFish.jpg");  if (src.empty())  {    cerr << "No image supplied ..." << endl;    return -1;  }  /// 将图像转换成灰度图并将其模糊  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( " Canny thresh:", "Source", &thresh, max_thresh, thresh_callback );  thresh_callback( 0, 0 );  waitKey(0);  return(0);}/** * @function thresh_callback */void thresh_callback(int, void* ){  Mat canny_output;  vector<vector<Point> > contours;  vector<Vec4i> hierarchy;  /// 用Canny检测边缘  Canny( src_gray, canny_output, thresh, thresh*2, 3 );  /// 找到轮廓  findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );  /// 画出轮廓  Mat drawing = Mat::zeros( canny_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, (int)i, color, 2, 8, hierarchy, 0, Point() );     }  /// 显示图像  namedWindow( "Contours", WINDOW_AUTOSIZE );  imshow( "Contours", drawing );}

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