// -----------------------------------------------------
    // ---------- FIND AVG LUMINENCE OF FRAME --------------
    // -----------------------------------------------------

    cv::Mat grayMat;
    cv::cvtColor(_classImage, grayMat, CV_BGR2GRAY);

    int Totalintensity = 0;
    for (int i=0; i < grayMat.rows; ++i){
        for (int j=0; j < grayMat.cols; ++j){
            Totalintensity += (int)grayMat.at<uchar>(i, j);
        }
    }

    // Find avg lum of frame
    float avgLum = 0;
    avgLum = Totalintensity/(grayMat.rows * grayMat.cols);