Question

这是我的代码：

        for (int ii = 0; ii <= 17; ii++) {
        System.out.println(ii);
        if(ii == 10) continue;
        String name = String.valueOf(ii);
        File pic = new File(name + ".jpg");
        BufferedImage image = ImageIO.read(pic); 
        int w ;
        int h ;
        int x_max = 0;
        int x_min = 1000;
        int y_max = 0;
        int y_min = 1000;
        for (int i = 0; i < image.getWidth(); i++) {
            for (int j = 0; j < image.getHeight(); j++) {
                Color c = new Color(image.getRGB(i, j));
                if(c.getBlue() == 0){
                    x_max = Math.max(x_max, i);
                    x_min = Math.min(x_min, i);
                    y_max = Math.max(y_max, j);
                    y_min = Math.min(y_min, j);
                }

            }
        }

        BufferedImage imagea = image;
        image = imagea.getSubimage(x_min - 1, y_min - 1,x_max - x_min + 3 , y_max - y_min + 3);
        h = Math.abs(y_max - y_min);
        w = Math.abs(x_max - x_min);}

这是输出：

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Exception in thread "main" java.awt.image.RasterFormatException: (x + width) is outside of Raster
    at sun.awt.image.ByteInterleavedRaster.createWritableChild(Unknown Source)
    at java.awt.image.BufferedImage.getSubimage(Unknown Source)
    at element.main(element.java:41)

错误是关于＆＃34; getsubimage＆＃34;功能，但我不知道它的原因。代码工作到第八个图像，并没有为它工作。如何工作＆＃34; getsubimage＆＃34;函数在java？

Answer 1

这一行：

image = imagea.getSubimage(x_min - 1, y_min - 1,x_max - x_min + 3 , y_max - y_min + 3);

假设生成的坐标距离左上边缘至少1个像素，偏离左边缘和下边缘3个像素。不要假设，或确保他们愿意。

java中的getsubimage（）函数

1 个答案: