Use opencv3.2 to read multiple images in a folder

To read an image that meets the requirements in a folder, you can use the function glob in opencv3.2. The function is defined as follows:

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

The first parameter is the path where the file is located, the second parameter is the container that stores the file path, and the third parameter is used to: when recursive is false, only traverse files that match the pattern in the specified folder, and when recursive is true , the subfolders under the specified folder will be traversed at the same time.

The example is as follows, read a tif file in a folder and display

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

using namespace cv;
using namespace std;

intmain()
{
	vector<String> files; //Store file path  
	vector<Mat> images; //Store file data

	glob("E:/Desktop/Example/*.TIF", files, true); //Read all file paths that meet the requirements in the folder
	size_t num = files.size(); //Number of eligible files read
	cout << "read" << num << "images" << endl;

	for (int i = 0; i < num; i++)
	{
		cout << "The path to the "<< i + 1 << " file is:" << files[i] << endl;
	}

	for (int i = 0; i < num; i++)
	{
		Mat img = imread(files[i], IMREAD_GRAYSCALE); //read grayscale image
		if (img.empty())
		{
			cerr << files[i] << " can't be loaded!" << endl;
			continue;
		}
		images.push_back(img); //Store image data in images
	}

	for (int i = 0; i < num; i++)
	{
		string name = format("%d", 1 + i); //display image
		imshow(name, images[i]);
	}


	waitKey();
	return 0;
}

The result is as follows: