Opencv Reading Multiple images from Multiple folder

Question

I have a folder which contain 100 or more sub folders and each of them contain many images.(Caltech Database)

I have problem with how to read them from the different folders ?

I want to store them as a single matrix with stacking columms of each image.

thomas_haximus · Accepted Answer · 2015-01-12 15:25:18Z

3

Use Boost Filesystem for C++. You can load all files in a directory and pass the file location to OpenCV in a string.

    string folder = "../images/";
    vector<string> imageFileLocations;
    namespace fs = boost::filesystem;
    vec v;
    copy(fs::directory_iterator(folder), fs::directory_iterator(), back_inserter(v));
    sort(v.begin(), v.end());
    for (vec::const_iterator it(v.begin()); it != v.end(); ++it) {
        if (fs::is_regular_file(*it)) {
            string location = it->string();
            imageFileLocations.push_back(location);
        }
    }

You'll have to add something recursive to be able to go into other folders. You can do that by checking if the iteraotr is at a file or a folder. See the Boost website for examples.

answered Jan 12, 2015 at 15:25

thomas_haximus

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1 Comment

Gunjan naik Over a year ago

Thanks,I have used back_inserter to do the recursive thing.It works well.

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