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

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#include "opencv2/datasets/tr_chars.hpp"

#include <opencv2/core.hpp>

#include <cstdio>
#include <cstdlib> // atoi

#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 description file: list_English_Img.m }";
    CommandLineParser parser(argc, argv, keys);
    string path(parser.get<string>("path"));
    if (parser.has("help") || path=="true")
    {
        parser.printMessage();
        return -1;
    }

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

    // ***************
    // dataset. train, test contain information about each element of appropriate sets and splits.
    // For example, let output first elements of these vectors and their sizes for last split.
    // And number of splits.
    int numSplits = dataset->getNumSplits();
    printf("splits number: %u\n", numSplits);

    vector< Ptr<Object> > &currTrain = dataset->getTrain(numSplits-1);
    vector< Ptr<Object> > &currTest = dataset->getTest(numSplits-1);
    vector< Ptr<Object> > &currValidation = dataset->getValidation(numSplits-1);
    printf("train size: %u\n", (unsigned int)currTrain.size());
    printf("test size: %u\n", (unsigned int)currTest.size());
    printf("validation size: %u\n", (unsigned int)currValidation.size());

    TR_charsObj *exampleTrain = static_cast<TR_charsObj *>(currTrain[0].get());
    TR_charsObj *exampleTest = static_cast<TR_charsObj *>(currTest[0].get());
    TR_charsObj *exampleValidation = static_cast<TR_charsObj *>(currValidation[0].get());
    printf("first train element:\nname: %s\n", exampleTrain->imgName.c_str());
    printf("label: %u\n", exampleTrain->label);
    printf("first test element:\nname: %s\n", exampleTest->imgName.c_str());
    printf("label: %u\n", exampleTest->label);
    printf("first validation element:\nname: %s\n", exampleValidation->imgName.c_str());
    printf("label: %u\n", exampleValidation->label);

    return 0;
}