label.addComponentListener(new ComponentAdapter() {
                @Override
                public void componentResized(ComponentEvent e) {
                    if (bufferedImage != null) {
                        scaleAndRepaintImage();
                    }
                }
            });

private static void scaleAndRepaintImage() {
        Image imageTemp = bufferedImage.getScaledInstance(label.getWidth(), label.getHeight(), Image.SCALE_SMOOTH);
        label.setIcon(new ImageIcon(imageTemp));
    }