opencv读取文件夹下面的所有图片

#define _CRT_SECURE_NO_WARNINGS
#include<opencv2\opencv.hpp>
#include<iostream>

using namespace std;
using namespace cv;

vector<Mat> read_images_in_folder(cv::String pattern);

int main()
{
	
	cv::String pattern = "train\\5\\*.png";
	vector<Mat> images = read_images_in_folder(pattern);

	return 0;
}

vector<Mat> read_images_in_folder(cv::String pattern)
{
	vector<cv::String> fn;
	glob(pattern, fn, false);

	vector<Mat> images;
	int num = 52;
	size_t count = fn.size(); //number of png files in images folder
	for (size_t i = 0; i < count; i++)
	{
		images.push_back(imread(fn[i]));
		//imshow("img", imread(fn[i]));
		char t[256];
		sprintf(t, "%d", num);
		string s = "train\\" + string(t) + ".jpg";
		imwrite(s, imread(fn[i]));
		num++;
		//waitKey(1000);
	}
	return images;
}