使用XZing扫描JAVA中的ISBN

Question

我想使用XZing扫描ISBN（EAN13）。这是我的功能：

private String readBarcode(String fileName) {
        File file = new File(fileName);
        BufferedImage image = null;
        BinaryBitmap bitmap = null;
        Result result = null;

        try {
            image = ImageIO.read(file);
            int[] pixels = image.getRGB(0, 0, image.getWidth(), image.getHeight(), null, 0, image.getWidth());
            RGBLuminanceSource source = new RGBLuminanceSource(image.getWidth(), image.getHeight(), pixels);
            bitmap = new BinaryBitmap(new HybridBinarizer(source));
        } catch (IOException e) {
            e.printStackTrace();
        }

        if (bitmap == null) {
            return null;
        }
        EAN13Reader reader = new EAN13Reader();
        try {

            result = reader.decode(bitmap);

            System.out.println("Decoded image successfully, result was : '" + result.getText() + "'");
            return result.getText();

        } catch (FormatException | NotFoundException e) {
            e.printStackTrace();
        }

        return null;
    }

我试图多次扫描下面的图像： ISBN

但我只收到NotFound异常。我忘了什么吗？