OpenCV/opencv_contrib/modules/datasets/samples/fr_lfw.cpp

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#include "opencv2/datasets/fr_lfw.hpp"

#include <opencv2/core.hpp>

#include <cstdio>

#include <string>
#include <vector>

using namespace std;
using namespace cv;
using namespace cv::datasets;

int main(int argc, char *argv[])
{
    const char *keys =
            "{ help h usage ? |    | show this message }"
            "{ path p         |true| path to dataset (lfw2 folder) }";
    CommandLineParser parser(argc, argv, keys);
    string path(parser.get<string>("path"));
    if (parser.has("help") || path=="true")
    {
        parser.printMessage();
        return -1;
    }

    Ptr<FR_lfw> dataset = FR_lfw::create();
    dataset->load(path);

    // ***************
    // test contains two images and flag that they belong to one person.
    // For example, let output splits number, test size and split 1, elements: 1, 301.
    int numSplits = dataset->getNumSplits();
    printf("splits number: %u\n", numSplits);
    printf("test size: %u\n", (unsigned int)dataset->getTest().size());

    FR_lfwObj *example = static_cast<FR_lfwObj *>(dataset->getTest()[0].get());
    printf("first test, first image: %s\n", example->image1.c_str());
    printf("first test, second image: %s\n", example->image2.c_str());
    printf("first test, same: %s\n", example->same?"yes":"no");

    example = static_cast<FR_lfwObj *>(dataset->getTest()[300].get());
    printf("300 test, first image: %s\n", example->image1.c_str());
    printf("300 test, second image: %s\n", example->image2.c_str());
    printf("300 test, same: %s\n", example->same?"yes":"no");

    return 0;
}