视频数据截取中心正方形求平均值

unsigned short IrFloodManager::caculateAverageValue(unsigned short *buffer,int w,int h){

    Grayscale16Pixel* pIR = (Grayscale16Pixel*)buffer;

    QVector<int> data_index;

    int center_x=w/2;

    int center_y=h/2;

    int first_point_x=center_x-match_width/2;

    int first_point_y=center_y-match_width/2;

    int end_point_x=center_x+match_width/2;

    int end_point_y=center_y+match_width/2;

    int sum=0;

    int i=first_point_x;

    int j=first_point_y;

    for (i;i<end_point_x;i++){

        for(j;j<end_point_y;j++){

            data_index.push_back(i*j);

        }

    }

    for (int i = 0; i < data_index.size(); ++i){

        sum+=pIR[data_index.at(i)];

    }

    unsigned short m_Value = sum/data_index.size();

    qDebug("calculate IR Value : %8d\n", m_Value);

    return m_Value;

}