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You can do something like this to print hex value

   Mat img1 = imread("g:/lib/opencv/samples/data/rubberwhale2.png", IMREAD_COLOR);
    Mat img2 = imread("g:/lib/opencv/samples/data/rubberwhale1.png", IMREAD_COLOR);
    Mat d1,d2;

    Ptr<cv::img_hash::AverageHash> m= cv::img_hash::AverageHash::create();
    m->compute(img1, d1);
    m->compute(img2, d2);
    for (int i = 0; i<d1.cols; i++)
        cout << std::hex<<int(d1.at<uchar>(0, i)) << "\t";
    cout << "\n";
    for (int i = 0; i<d2.cols; i++)
        cout << std::hex<<int(d2.at<uchar>(0, i)) << "\t";
    cout << "\n";

and to get hamming norm :

    cout <<"Hamming norm "<< norm(d1, d2, NORM_HAMMING)<<"\n";