opencv计算两点间的距离

要计算两点之间的距离，可以使用以下代码片段：

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

double getDistance(cv::Point pointO, cv::Point pointA) {
    double distance;
    distance = pow((pointO.x - pointA.x), 2) + pow((pointO.y - pointA.y), 2);
    distance = sqrt(distance);
    return distance;
}

int main() {
    cv::Point pointO(0, 0); // 起点坐标
    cv::Point pointA(3, 4); // 终点坐标

    double distance = getDistance(pointO, pointA);
    
    std::cout << "两点之间的距离为: " << distance << std::endl;

    return 0;
}