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A code to take a 2D mat and add noise to it:

void add_noise(Mat &mat, float scale)
{
    for (int j = 0; j < mat.rows; j++)
    {
        for (int i = 0; i < mat.cols; i++)
        {
            float noise = static_cast<float>(rand() % 256);
            noise /= 255.0f;

            mat.at<float>(j, i) = (mat.at<float>(j, i) + noise*scale) / (1.0f + scale);

            if (mat.at<float>(j, i) < 0)
                mat.at<float>(j, i) = 0;
            else if (mat.at<float>(j, i) > 1)
                mat.at<float>(j, i) = 1;
        }
    }
}

A code to take a 2D mat of type CV_32FC1 and add noise to it:

void add_noise(Mat &mat, float scale)
{
    for (int j = 0; j < mat.rows; j++)
    {
        for (int i = 0; i < mat.cols; i++)
        {
            float noise = static_cast<float>(rand() % 256);
            noise /= 255.0f;

            mat.at<float>(j, i) = (mat.at<float>(j, i) + noise*scale) / (1.0f + scale);

            if (mat.at<float>(j, i) < 0)
                mat.at<float>(j, i) = 0;
            else if (mat.at<float>(j, i) > 1)
                mat.at<float>(j, i) = 1;
        }
    }
}