opencv图片拼接报错cv::Stitcher::ERR_NEED_MORE_IMGS (1)

#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/stitching.hpp"
#include <iostream>
using namespace std;
using namespace cv;
bool try_use_gpu = false;
bool divide_images = false;
Stitcher::Mode mode = Stitcher::PANORAMA;
vector<Mat> imgs;
string result_name = "result.jpg";
void printUsage(char** argv);
int parseCmdArgs(int argc, char** argv);
int main(int argc, char* argv[])
{
    //int retval = parseCmdArgs(argc, argv);
    //if (retval) return -1;
    Mat img1 = imread("/hard_disk2/Receive_files/xls/mask-rcnn-test/QT/1.png");
    Mat img2 = imread("/hard_disk2/Receive_files/xls/mask-rcnn-test/QT/2.png");
    imgs.push_back(img1);
    imgs.push_back(img2);
//    imgs.push_back(img1);
//    imgs.push_back(img2);
//    imgs.push_back(img1);
//    imgs.push_back(img2);
    Mat pano;
    Ptr<Stitcher> stitcher = Stitcher::create(mode, try_use_gpu);
    Stitcher::Status status = stitcher->stitch(imgs, pano);
    if (status != Stitcher::OK)
    {
        cout << "Can't stitch images, error code = " << int(status) << endl;
        return -1;
    }
    imwrite(result_name, pano);
    waitKey(0);
    cout << "stitching completed successfully
" << result_name << " saved!";
    return 0;
}

 代码如上，参考https://docs.opencv.org/trunk/d8/d19/tutorial_stitcher.html

运行时报错cv::Stitcher::ERR_NEED_MORE_IMGS (1)，后来查找原因，发现是我随便选取了两张图片进行拼接，然而这两张图片并没有重叠的部分，然后修改了两张图片之后，运行正常了。所以进行图片拼接的时候需要注意要有重叠部分才可以。