OpenCV CommandLineParser Example

opencv_cmd_args_example.cpp

/*
 * Adapt from this example: http://docs.opencv.org/3.0-beta/modules/core/doc/command_line_parser.html
 */
#include "opencv2/core.hpp"
#include "opencv2/core/cvstd.hpp" // cv::String
#include <iostream>

using namespace cv;
using std::cout;
using std::cerr;
using std::endl;

int main(int argc, char* argv[])
{
    String keys = 
        "{help h usage ? |      | print this message   }"
        "{@image1        |      | image1 for compare   }"
        "{@image2        |      | image2 for compare   }"
        "{@repeat        |1     | number               }"
        "{path           |.     | path to file         }"
        "{fps            | -1.0 | fps for output video }"
        "{N count        |100   | count of objects     }"
        "{ts timestamp   |      | use time stamp       }";

    CommandLineParser parser(argc, argv, keys);
    parser.about("Trying OpenCV commandline parser");

    if (parser.has("help"))
    {
        parser.printMessage();
        return 0;
    }

    int N = parser.get<int>("N");
    double fps = parser.get<double>("fps");
    String path = parser.get<String>("path");

    bool use_time_stamp = parser.has("timestamp");

    String img1 = parser.get<String>(0);
    String img2 = parser.get<String>(1);
    int repeat = parser.get<int>(2);

    if (!parser.check())
    {
        parser.printErrors();
        return 1;
    }

    if (img1 == "" || img2 == "") {
        cerr << "Missing img1 or img2" << endl;
        parser.printMessage();
        return 1;
    }

    cout << img1 << endl;
    cout << img2 << endl;
    cout << repeat << endl;

    return 0;
}