Function show_mask

lesson6-Segmentation/SegDataset.cpp:31–65

void show_mask(std::string json_path, std::string image_type) {
    using namespace std;
    using json = nlohmann::json;
    std::string image_path = replace_all_distinct(json_path, ".json", image_type);
    cv::Mat image = cv::imread(image_path);
    cv::Mat mask;
    mask.create(image.size(), CV_8UC3);

    std::ifstream jfile(json_path);
    json j;
    jfile >> j;
    size_t num_blobs = j["shapes"].size();

    for (int i = 0; i < num_blobs; i++)
    {
        std::string name = j["shapes"][i]["label"];
        size_t points_len = j["shapes"][i]["points"].size();
        cout << name << endl;
        std::vector<cv::Point> contour = {};
        for (int t = 0; t < points_len; t++)
        {
            int x = round(double(j["shapes"][i]["points"][t][0]));
            int y = round(double(j["shapes"][i]["points"][t][1]));
            cout << x << "\t" << y << endl;
            contour.push_back(cv::Point(x, y));
        }
        const cv::Point* ppt[1] = { contour.data() };
        int npt[] = { int(contour.size()) };
        cv::fillPoly(mask, ppt, npt, 1, cv::Scalar(255, 255, 255));
    }
    cv::imshow("mask", mask);
    cv::imshow("image", image);
    cv::waitKey(0);
    cv::destroyAllWindows();
}

void SegDataset::draw_mask(std::string json_path, cv::Mat &mask){
    std::ifstream jfile(json_path);