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MatOfRect faces = new MatOfRect();

        if (mJavaDetector != null)
            mJavaDetector.detectMultiScale(mGray, faces, 1.1, 2,
                    4, // TODO: objdetect.CV_HAAR_FIND_BIGGEST_OBJECT -> with this parameter only biggest face will be detected
                    new Size(mAbsoluteFaceSize, mAbsoluteFaceSize),
                    new Size());

    Rect[] facesArray = faces.toArray();
    for (int i = 0; i < facesArray.length; i++) {
        Core.rectangle(mRgba, facesArray[i].tl(), facesArray[i].br(),
                FACE_RECT_COLOR, 2);
        xCenter = (facesArray[i].x + facesArray[i].width + facesArray[i].x) / 2;
        yCenter = (facesArray[i].y + facesArray[i].y + facesArray[i].height) / 2;
        Point center = new Point(xCenter, yCenter);