glob在opencv3下，并且命名空间为cv::glob()能够直接调用，在官网中只说明了如下调用方式，并没有给出具体的例子。但通过使用可以知道函数目的是将pattern路径下的所用文件名存进result中。

void cv::glob(String pattern, std::vector< String > & result, bool recursive = false)

下面例子主要功能是打开”/home/rui”路径下所有的图片并显示出来:

#include "opencv2/imgproc.hpp"


int main()
{
    std::vector<cv::String> filenames; // notice here that we are using the Opencv's embedded "String" class
    cv::String folder = "/home/rui"; // again we are using the Opencv's embedded "String" class

    cv::glob(folder, filenames); // new function that does the job ;-)

    for(size_t i = 0; i < filenames.size(); ++i)
    {
        std::cout<<filenames[i]<<std::endl;
        cv::Mat src = cv::imread(filenames[i]);

        if(!src.data)
            std::cerr << "Problem loading image!!!" << std::endl;

        cv::imshow("temp",src);
        cv::waitKey(0);
        /* do whatever you want with your images here */
    }
}