void Reader_MultiSourceFrameArrived(object sender, MultiSourceFrameArrivedEventArgs e)
    {
        var reference = e.FrameReference.AcquireFrame();

        var colorFrame = reference.ColorFrameReference.AcquireFrame();
        var depthFrame = reference.DepthFrameReference.AcquireFrame();
        var bodyIndexFrame = reference.BodyIndexFrameReference.AcquireFrame();

        if (colorFrame != null && depthFrame != null && bodyIndexFrame != null)
        {
            // Update the image source.
            camera.Source = _backgroundRemovalTool.GreenScreen(colorFrame, depthFrame, bodyIndexFrame);
        }

        colorFrame.Dispose();
        depthFrame.Dispose();
        bodyIndexFrame.Dispose();
    }