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Hi,

I can't assure you this is the fastest way to do it, but it takes around 2-3 ms per frame (640x480) on a similar computer. General idea is natively inverting BGR -> RGB and using BufferedImage setDataElements.

 public Image toBufferedImageNoEncode(Mat m){
        long time = System.currentTimeMillis();
        int type = BufferedImage.TYPE_BYTE_GRAY;
        if ( m.channels() > 1 ) {
            Mat m2 = new Mat();
            Imgproc.cvtColor(m,m2,Imgproc.COLOR_BGR2RGB);
            type = BufferedImage.TYPE_3BYTE_BGR;
            m = m2;
        }

        byte [] b = new byte[m.channels()*m.cols()*m.rows()];
        m.get(0,0,b); // get all the pixels
        BufferedImage image = new BufferedImage(m.cols(),m.rows(), type);
        image.getRaster().setDataElements(0, 0, m.cols(),m.rows(), b);
        System.out.println("To buffer: " + (System.currentTimeMillis() - time));

        return image;


    }