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You can use this program. Give image path as first argument. Select a rectangle and press g key values are printed in console.

#include "opencv2/opencv.hpp"
#include <iostream>
#include <map>

using namespace cv;
using namespace std;


const String keys =
"{Aide h usage ? help  |     | Afficher ce message   }"
"{@arg1                |     | chemin complet de l'image couleur (3 canaux)}"
;

struct ParamColorSpace {
    int rctEnCours;
    Rect r;
    Mat img;
    map<int, String> spaceName;
    map<int, Mat> colorSpace;
    String nomFenetre;
};

void DefRectangle(int event, int x, int y, int flags, void *userData)
{
    ParamColorSpace *pgc = (ParamColorSpace*)userData;
    if (flags == EVENT_FLAG_LBUTTON)
    {
        if (pgc->rctEnCours == 0)
        {
            pgc->r.x = x;
            pgc->r.y = y;
            pgc->r.width = 0;
            pgc->r.height = 0;
            pgc->rctEnCours = 1;
        }
        else if (pgc->rctEnCours == 1)
        {
            Point tl = pgc->r.tl(), br = pgc->r.br();
            if (x != pgc->r.x)
            {
                if (x < pgc->r.x)
                {
                    pgc->r.x = x;
                    pgc->r.width = br.x - x - 1;
                }
                else
                    pgc->r.width = x - tl.x - 1;

            }
            if (y != pgc->r.y)
            {
                if (y < pgc->r.y)
                {
                    pgc->r.y = y;
                    pgc->r.height = br.y - y - 1;
                }
                else
                    pgc->r.height = y - tl.y - 1;

            }
            if (pgc->r.br().x > pgc->img.size().width)
            {
                pgc->r.width = pgc->img.size().width - pgc->r.x;
            }
            if (pgc->r.br().y > pgc->img.size().height)
            {
                pgc->r.height = pgc->img.size().height - pgc->r.y;
            }

        }
    }
    else if (event == EVENT_LBUTTONUP && pgc->rctEnCours == 1)
    {
        Point tl = pgc->r.tl(), br = pgc->r.br();
        pgc->rctEnCours = 0;
    }
    Mat r = pgc->img.clone();
    rectangle(r, pgc->r, Scalar(0, 255, 0), 2);
    imshow(pgc->nomFenetre, r);
    waitKey(10);
}


int main(int argc, char* argv[])
{
    CommandLineParser parser(argc, argv, keys);

    if (parser.has("help"))
    {
        parser.printMessage();
        return 0;
    }
    String nomFic = parser.get<String>(0);
    //nomFic = "c:/lib/opencv/samples/data/baboon.jpg";
    if (nomFic.length() == 0)
    {
        parser.printMessage();
        return 0;
    }
    ParamColorSpace pgc;
    pgc.rctEnCours = 0;
    pgc.img = imread(nomFic, IMREAD_COLOR);
    pgc.nomFenetre = "My Image";
    pgc.spaceName.insert(make_pair(CV_BGR2HSV, String("HSV")));
    pgc.spaceName.insert(make_pair(CV_BGR2YUV, String("YUV")));

    imshow(pgc.nomFenetre, pgc.img);

    setMouseCallback(pgc.nomFenetre, DefRectangle, &pgc);
    Mat mask, background, foreground;
    Mat mk, bk, fk;
    bool initGrabCut = false;
    mask = Mat(pgc.img.size(), CV_8UC1, Scalar::all(cv::GC_PR_BGD));
    int code = 0;
    do
    {
        code = waitKey(30) & 0xFF;
        if (code=='g')
        {
            mask = Mat(pgc.img.size(), CV_8UC1, Scalar::all(0));
            mask(pgc.r) = 255;
            map<int, String>::iterator ite = pgc.spaceName.begin();
            for (; ite!=pgc.spaceName.end(); ite++)
            {
                if (pgc.colorSpace.find(ite->first) == pgc.colorSpace.end())
                {
                    Mat s;
                    cvtColor(pgc.img, s, ite->first);
                    pgc.colorSpace.insert(make_pair(ite->first, s));
                }
                if (pgc.colorSpace.find(ite->first) == pgc.colorSpace.end())
                    return -1;
                Mat mean, std;
                Mat c = pgc.colorSpace.find(ite->first)->second;
                meanStdDev(c, mean, std, mask);
                cout << "Color Space :" << ite->second << "\n";
                cout << "Mean : " << mean.t() << "\n";
                cout << "Std : " << std.t() << "\n";

            }
        }
    } 
    while (code != 27);

}