java - reshape bufferedImage 并将 double 值存储在 txt 中

Question

我想加载一张图像，将其大小调整为 100x100，将其 reshape 为 1x100000，并将其保存在 txt 文件中。所以我在 bufferedImage 中读取它，并将其大小调整为 100x100。我正在寻找 reshape 它并保存它的 double 值的下一步:

            File img = new File(train_path + fileNames.get(i) + "/" + imageNames.get(i).get(j));
            BufferedImage in = ImageIO.read(img);
            BufferedImage newImage = new BufferedImage(in.getWidth(), in.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
            Graphics2D g = newImage.createGraphics();
            g.drawImage(in, 0, 0, null);
            g.dispose();

            BufferedImage newImg = new BufferedImage(100, 100, BufferedImage.TYPE_BYTE_GRAY);

            Graphics gr = newImg.createGraphics();
            gr.drawImage(newImage, 0, 0, 100, 100, null);
            gr.dispose();
            System.out.println(newImage.getHeight()+ " "+ newImage.getWidth());
            System.out.println(newImg.getHeight()+ " "+ newImg.getWidth());

Answer 1

您可以从初始图像中获取int数组:

int[] pixels = newImage.getRGB(0, 0, 100, 100, null, 0, 100);

这意味着在一个新数组中获取从 (0,0) 到 (100,100) 的 RGB 值，从索引 0 开始，每行偏移索引 100。

然后对于像素中的每个int，灰度值由下式给出:

int gray = pixels[i] & 0xFF;