(44)Air Band OpenCV2.4.13_点-多边形检测

来源：互联网发布：单片机工作过程编辑：程序博客网时间：2024/06/01 08:13

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;/** * @function main */int main(){  /// 创建图像  const int r = 100;  Mat src = Mat::zeros( Size( 4*r, 4*r ), CV_8UC1 );  /// 创建点序列来形成轮廓  vector<Point2f> vert(6);  vert[0] = Point( 3*r/2, static_cast<int>(1.34*r) );  vert[1] = Point( 1*r, 2*r );  vert[2] = Point( 3*r/2, static_cast<int>(2.866*r) );  vert[3] = Point( 5*r/2, static_cast<int>(2.866*r) );  vert[4] = Point( 3*r, 2*r );  vert[5] = Point( 5*r/2, static_cast<int>(1.34*r) );  /// 在原图像中画出  for( int j = 0; j < 6; j++ )     { line( src, vert[j],  vert[(j+1)%6], Scalar( 255 ), 3, 8 ); }  /// 得到边缘  vector<vector<Point> > contours; vector<Vec4i> hierarchy;  Mat src_copy = src.clone();  findContours( src_copy, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);  /// 计算到轮廓的距离  Mat raw_dist( src.size(), CV_32FC1 );  for( int j = 0; j < src.rows; j++ )     { for( int i = 0; i < src.cols; i++ )          { raw_dist.at<float>(j,i) = (float)pointPolygonTest( contours[0], Point2f((float)i,(float)j), true ); }     }  double minVal; double maxVal;  minMaxLoc( raw_dist, &minVal, &maxVal, 0, 0, Mat() );  minVal = abs(minVal); maxVal = abs(maxVal);  /// 几何上描述距离  Mat drawing = Mat::zeros( src.size(), CV_8UC3 );  for( int j = 0; j < src.rows; j++ )     { for( int i = 0; i < src.cols; i++ )          {            if( raw_dist.at<float>(j,i) < 0 )              { drawing.at<Vec3b>(j,i)[0] = (uchar)(255 - abs(raw_dist.at<float>(j,i))*255/minVal); }            else if( raw_dist.at<float>(j,i) > 0 )              { drawing.at<Vec3b>(j,i)[2] = (uchar)(255 - raw_dist.at<float>(j,i)*255/maxVal); }            else              { drawing.at<Vec3b>(j,i)[0] = 255; drawing.at<Vec3b>(j,i)[1] = 255; drawing.at<Vec3b>(j,i)[2] = 255; }          }     }  /// 创建窗口显示结果  const char* source_window = "Source";  namedWindow( source_window, WINDOW_AUTOSIZE );  imshow( source_window, src );  namedWindow( "Distance", WINDOW_AUTOSIZE );  imshow( "Distance", drawing );  waitKey(0);  return(0);}

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