我正在嘗試應用[-1][-1][-1][-1][8][-1][-1][-1][-1]3*3 拉普拉斯濾波器到著名照片（png 擴展名）的灰度版本。我主要使用BufferedImage該類來處理圖像。這是拉普拉斯濾波器方法。private BufferedImage measureContrast(BufferedImage image) {        BufferedImage grayScale = createGrayscaleImage(image);        BufferedImage copy = copyImage(grayScale);        int width = image.getWidth();        int height = image.getHeight();        int sum=0;        int a;         //3*3 Laplacian filter (-1,-1,-1), (-1,8,-1), (-1,-1,-1)        for(int y=1;y<height-1;y++)            for(int x=1;x<width-1;x++) {                sum = (-1*(grayScale.getRGB(x-1, y-1)&0xff)) + (-1*(grayScale.getRGB(x, y-1)&0xff)) + (-1*(grayScale.getRGB(x+1, y-1)&0xff))                        + (-1*(grayScale.getRGB(x-1, y)&0xff)) + (8*(grayScale.getRGB(x,y)&0xff)) + (-1*(grayScale.getRGB(x+1, y)&0xff)) +                        (-1*(grayScale.getRGB(x-1, y+1)&0xff)) + (-1*(grayScale.getRGB(x, y+1)&0xff)) + (-1*(grayScale.getRGB(x+1, y+1)&0xff));                             a = ((grayScale.getRGB(x, y)>>24)&0xff);                copy.setRGB(x, y, ((a<<24)|(sum<<16)|(sum<<8)|(sum)));            }return copy;如果我運行該代碼，結果是這樣的這顯然是錯誤的。圖像中突然出現奇怪的粗線。我可以確保灰度版本是正確的，因為當我在應用過濾器之前運行以下代碼時，輸出會提供完美的灰度圖像。private BufferedImage measureContrast(BufferedImage image) {        BufferedImage grayScale = createGrayscaleImage(image);        BufferedImage copy = copyImage(grayScale); /*rest of the code is commented*/return copy;我一直試圖找到這個問題幾個小時，但我認為代碼沒有任何問題......任何見解將不勝感激。提前致謝！