فیلتر نقطه میانی در جاوا (Midpoint filter)

public class Midpoint_Filter {
	public static void main(String[] args) {
		BufferedImage img = null;
		File f = null;
		// read image
		try {
			f = new File("Midpoint Filter input.jpg");
			img = ImageIO.read(f);
		} catch (IOException e) {
			System.out.println(e);
		}
		// get width and height
		int width = img.getWidth();
		int height = img.getHeight();
		BufferedImage outputimage = new
 BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
		System.out.println("Mdipoint Filter starts....");
		for (int x = 1; x < width - 1; x++) {
			for (int y = 1; y < height - 1; y++) {
				int mid = MidPoint(img, x, y);
				Color col = new Color(mid, mid, mid);
				outputimage.setRGB(x, y, col.getRGB());
			}
		}
		System.out.println("start create output image....");
		// write image
		try {
			f = new File("Midpoint Filter output.jpg");
			ImageIO.write(outputimage, "jpg", f);
		} catch (IOException e) {
			System.out.println(e);
		}
		System.out.println("program finish....");
	}
	public static int MidPoint(BufferedImage img, int x, int y) {
		int neighbour[] = new int[9];
		neighbour[0] = (getRed(img.getRGB(x - 1, y - 1)) 
				+ getGreen(img.getRGB(x - 1, y - 1))
				+ getBlue(img.getRGB(x - 1, y - 1))) /3;
		neighbour[1] = (getRed(img.getRGB(x + 1, y + 1)) 
				+ getGreen(img.getRGB(x + 1, y + 1))
				+ getBlue(img.getRGB(x + 1, y + 1))) /3;
		neighbour[2] = (getRed(img.getRGB(x, y - 1)) + 
				getGreen(img.getRGB(x, y - 1)) +
				getBlue(img.getRGB(x, y - 1)))/3;
		neighbour[3] = (getRed(img.getRGB(x, y + 1)) +
				getGreen(img.getRGB(x, y + 1)) +
				getBlue(img.getRGB(x, y + 1)))/3;
		neighbour[4] = (getRed(img.getRGB(x - 1, y)) +
				getGreen(img.getRGB(x - 1, y)) +
				getBlue(img.getRGB(x - 1, y)))/3;
		neighbour[5] = (getRed(img.getRGB(x + 1, y)) +
				getGreen(img.getRGB(x + 1, y)) +
				getBlue(img.getRGB(x + 1, y)))/3;
		neighbour[6] = (getRed(img.getRGB(x - 1, y + 1)) +
				getGreen(img.getRGB(x - 1, y + 1)) +
				getBlue(img.getRGB(x - 1, y + 1)))/3;
		neighbour[7] = (getRed(img.getRGB(x + 1, y - 1)) +
				getGreen(img.getRGB(x + 1, y - 1)) +
				getBlue(img.getRGB(x + 1, y - 1)))/3;
		neighbour[8] = (getRed(img.getRGB(x, y)) +
				getGreen(img.getRGB(x, y)) +
				getBlue(img.getRGB(x, y)))/3;
		Arrays.sort(neighbour);
		return (neighbour[8] + neighbour[0]) / 2;
	}
	public static int getRed(int rgb) {
		return (rgb >> 16) & 0xff;
	}
	public static int getBlue(int rgb) {
		return rgb & 0xff;
	}
	public static int getGreen(int rgb) {
		return (rgb >> 8) & 0xff;
	}
}