#include <opencv2/opencv.hpp>
#include <iostream>
#include <opencv2/imgproc/types_c.h>

using namespace cv;
using namespace std;
int main()
{
    Mat Img = Mat(500, 500, CV_8UC1, cv::Scalar(0));
    Mat image = Mat(500, 500, CV_8UC1, cv::Scalar(50));
    Point A = Point(150, 150);
    Point B = Point(280, 280);
    LineIterator line_iter(image, A, B);
    vector<Point> v_pnts;
    v_pnts.reserve(line_iter.count + 2);
    for (int i = 0; i < line_iter.count; ++i, ++line_iter)
    {
        v_pnts.emplace_back(line_iter.pos());
    }
    v_pnts.emplace_back(A);
    v_pnts.emplace_back(B);

    for (int i = 0; i < v_pnts.size(); i++)
    {
        Img.at<uchar>(v_pnts[i]) = 255;
    }

    
    imshow("image_color123", Img);
    Mat image_color = image.clone();



    cvtColor(image_color, image_color, CV_GRAY2BGR);
    for (const auto& kn : v_pnts)
    {
        image_color.ptr<Vec3b>(kn.y)[kn.x] = Vec3b(0, 0, 255);
    }
    imshow("image_color", image_color);
    waitKey();
    return 0;
}

所有的坐标顶点都存放在vector v_pnts内；
结果如下图：