opencv提取轮廓范围的图（opencv获取轮廓）

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 #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; }