public BufferedImage zoomIn(BufferedImage bi, int scale)
	{
		int width = scale * bi.getWidth();
		int height = scale * bi.getHeight();
 
		BufferedImage biScale = new BufferedImage(width, height, bi.getType());
 
                // Cicla dando un valore medio al pixel corrispondente
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biScale.setRGB(i, j, bi.getRGB(i/scale, j/scale));
 
		return biScale;
	}