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    GECKO 1.0 
   Human-computer interface based on hand gesture recognition 
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 Returns the average of the pixel's values. {
    //-- Calculate average value
    double average = 0;
    for (int i = 0; i < ROI.cols; i++ )
        for( int j = 0; j < ROI.rows; j++)
            average += (int) ROI.at<unsigned char>(i, j);
    average /= (double) (ROI.cols * ROI.rows);
    return ceil(average);
}
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 1.7.4