Opencv的findcontours函数的大坑

比较了两个图一个会产生2个轮廓,一个只产生一个轮廓

/**
 * @function findContours_Demo.cpp
 * @brief Demo code to find contours in an image
 * @author OpenCV team
 */

#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include <iostream>
using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    CommandLineParser parser(argc, argv, "{@input | HappyFish.jpg | input image}");
    Mat src = imread(samples::findFile(parser.get<String>("@input")));
    Mat src_gray , binarized ;
    cvtColor(src, src_gray, COLOR_BGR2GRAY);
    threshold(src_gray, binarized, 90, 255, THRESH_BINARY); //THRESH_BINARY_INV);
    //savedata(binarized);
    vector<vector<Point>> contours;
    findContours(binarized, contours, RETR_LIST, CHAIN_APPROX_NONE); // 查找轮廓
    for (size_t i = 0; i < contours.size(); i++)
    {
        //contourArea(contours[i]);
        double area = moments(contours[i]).m00;
        cout << "轮廓" << i << " 面积：" << area << endl;
        drawContours(src, contours, i, Scalar(0, 255, 0), 2);
    }
    string windowName = "Contours " + to_string(contours.size());
    imshow(windowName, src);
    waitKey();
    return 0;
}