简单的java高斯模糊算法

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;   

public class Test
{
 /**
     * 简单高斯模糊算法
     * 
     * @param args
     * @throws IOException [参数说明]
     * 
     * @return void [返回类型说明]
     * @exception throws [违例类型] [违例说明]
     * @see [类、类#方法、类#成员]
     */
    public static void main(String[] args)
        throws IOException
    {
        BufferedImage img = ImageIO.read(new File("d:\\My Documents\\psb.jpg"));
        System.out.println(img);
        int height = img.getHeight();
        int width = img.getWidth();
        int[][] matrix = new int[3][3];
        int[] values = new int[9];
        for (int i = 0; i < width; i++)
        {
            for (int j = 0; j < height; j++)
            {
                readPixel(img, i, j, values);
                fillMatrix(matrix, values);
                img.setRGB(i, j, avgMatrix(matrix));
            }
        }
        ImageIO.write(img, "jpeg", new File("d:/test.jpg"));//保存在d盘为test.jpeg文件
    }
    
    private static void readPixel(BufferedImage img, int x, int y, int[] pixels)
    {
        int xStart = x - 1;
        int yStart = y - 1;
        int current = 0;
        for (int i = xStart; i < 3 + xStart; i++)
        {
            for (int j = yStart; j < 3 + yStart; j++)
            {
                int tx = i;
                if (tx < 0)
                {
                    tx = -tx;
                }
                else if (tx >= img.getWidth())
                {
                    tx = x;
                }
                
                int ty = j;
                if (ty < 0)
                {
                    ty = -ty;
                }
                else if (ty >= img.getHeight())
                {
                    ty = y;
                }
                pixels[current++] = img.getRGB(tx, ty);
            }
        }
    }
    
    private static void fillMatrix(int[][] matrix, int... values)
    {
        int filled = 0;
        for (int i = 0; i < matrix.length; i++)
        {
            int[] x = matrix[i];
            for (int j = 0; j < x.length; j++)
            {
                x[j] = values[filled++];
            }
        }
    }
    
    private static int avgMatrix(int[][] matrix)
    {
        int r = 0;
        int g = 0;
        int b = 0;
        for (int i = 0; i < matrix.length; i++)
        {
            int[] x = matrix[i];
            for (int j = 0; j < x.length; j++)
            {
                if (j == 1)
                {
                    continue;
                }
                Color c = new Color(x[j]);
                r += c.getRed();
                g += c.getGreen();
                b += c.getBlue();
            }
        }
        return new Color(r / 8, g / 8, b / 8).getRGB();
    }
}