OpenCV——查找、绘制轮廓

 #include <opencv2/opencv.hpp>
 #include <iostream>

 using namespace cv;
 using namespace std;

 int main(int argc, char** argv)
 {
     Mat src = imread("test.jpg");
     Mat src_gray,binary,dst=Mat::zeros(src.size(),CV_8UC3);
     if (src.empty()) {
         printf("Could not load image...");
         return -;
     }
     imshow("Input Image",src);

     //二值化
     cvtColor(src, src_gray, COLOR_BGR2GRAY);
     threshold(src_gray, binary, , , THRESH_BINARY | THRESH_OTSU);
     //binary = ~binary;//取反
     imshow("binary", binary);

     //发现轮廓
     vector<vector<Point>> contours;
     vector<Vec4i> hireachy;
     findContours(binary, contours, hireachy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point());

     //绘制所有轮廓
     for (size_t t = ; t < contours.size(); t++)
     {
         drawContours(dst, contours, t, Scalar(, , ), , , Mat(), , Point());//dst必须先初始化
     }

     imshow("contours", dst);

     waitKey();

     return ;
 }