我已经设法用zxing扫描了一个tiff文件。这个文件里面有4个一维条形码，但是zxing显示了2个水平条形码。如何扫描垂直条形码？当前代码仅成功扫描水平条形码，但未能发现垂直条形码？
这是我的密码：

public static void main(String[] args) throws IOException, NotFoundException {
    InputStream barCodeInputStream = new FileInputStream("C:/Temp/test.tif");
    BufferedImage barCodeBufferedImage = ImageIO.read(barCodeInputStream);
    LuminanceSource source = new BufferedImageLuminanceSource(barCodeBufferedImage);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    com.google.zxing.Reader reader = new MultiFormatReader();
    MultipleBarcodeReader bcReader = new GenericMultipleBarcodeReader(reader);

    Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
    hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);

    StringBuilder sb = new StringBuilder();
    for (Result result : bcReader.decodeMultiple(bitmap, hints)) {
        sb.append(result.getText()).append(" \n");
    }
    System.out.println(sb.toString());
}