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This work for me in C++. The one that I learnt from http://answers.opencv.org/question/5395

 double cont_meas(const Mat&img)
{
    Mat dx, dy;
    Sobel(img, dx, CV_32F, 1, 0, 3);
    Sobel(img, dy, CV_32F, 0, 1, 3);
    magnitude(dx, dy, dx);
    return sum(dx)[0];
}

int main(int argc, const char** argv)
{
//my coding

Mat contrast = cont_meas(face) / 1e3; //face is my image name

//my coding
}

This work for me in C++. The one that I learnt from http://answers.opencv.org/question/5395

 double cont_meas(const contrast_measure(const Mat&img)
{
    Mat dx, dy;
    Sobel(img, dx, CV_32F, 1, 0, 3);
    Sobel(img, dy, CV_32F, 0, 1, 3);
    magnitude(dx, dy, dx);
    return sum(dx)[0];
}

int main(int argc, const char** argv)
{
//my coding

Mat contrast = cont_meas(face) std::cout << "contrast=" << contrast_measure(face) / 1e3; 1e3 << std::endl; //face is my image name

//my coding
}