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

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#include "opencv2/datasets/pd_caltech.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 }";
    CommandLineParser parser(argc, argv, keys);
    string path(parser.get<string>("path"));
    if (parser.has("help") || path=="true")
    {
        parser.printMessage();
        return -1;
    }

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

    // ***************
    // dataset contains for each object its images.
    // currently on loading extract all images to folder path/../images/
    // For example, let output train size and first element of first object
    // and number of it's images.
    printf("train size: %u\n", (unsigned int)dataset->getTrain().size());

    PD_caltechObj *example = static_cast<PD_caltechObj *>(dataset->getTrain()[0].get());
    printf("first train object:\n");
    printf("name: %s\n", example->name.c_str());
    printf("images number: %u\n", (unsigned int)example->imageNames.size());
    printf("first image name: %s\n", example->imageNames[0].c_str());
    printf("images were extracted to path/../images/\n");

    return 0;
}