opencv提取轮廓大于某个阈值的图像

本文实例为大家分享了opencv提取轮廓大于某个阈值的图像，供大家参考，具体内容如下

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									#include "stdafx.h"

									#include "cv.h"

									#include "highgui.h"

									#include "stdio.h"

									#include"core/core.hpp"

									#include "opencv2/highgui/highgui.hpp"

									#include "opencv2/core/core.hpp"

									#include "opencv2/imgproc/imgproc.hpp"

									#include <iostream>

									using namespace cv;

									using namespace std;

									int main(int argc, char** argv)

									{

									const char* inputImage = "d:/3.jpg"; 

									 Mat img; 

									 int threshval =100; 

									 img = imread(inputImage,0); 

									 if (img.empty()) 

									 { 

									 cout << "Could not read input image file: " << inputImage << endl; 

									 return -1; 

									 } 

									 img = img >110; 

									 namedWindow("Img", 1); 

									 imshow("Img", img); 

									 vector<vector<Point> > contours; 

									 vector<Vec4i>hierarchy; 

									 vector<Point> contour;

									 Mat dst = Mat::zeros(img.rows, img.cols, CV_8UC3); 

									 findContours(img, contours,hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE); 

									 int m=contours.size();//得到轮廓的数量

									 int n=0;

									 for (int i =0;i<m;++i)

									 {

									 n=contours[i].size();

									 for (int j =0;j<n;++j)

									 {

									  contour.push_back(contours[i][j]);//读取每个轮廓的点

									 }

									 double area = contourArea(contour); //取得轮廓面积

									 if (area>10)//只画出轮廓大于10的点

									 {

									 Scalar color( (rand()&255), (rand()&255), (rand()&255) ); 

									  drawContours( dst, contours, i, color, 1, 8, hierarchy ); 

									 }

									 contour.clear();

									 }

									 namedWindow("src", 1); 

									 imshow( "src", dst ); 

									  waitKey();

									  return 0;

									}