使用zXing和PDFBox解码（无图像）PDF格式的DataMatrix

Question

我需要在PDF中解码DataMatrix，在我的情况下，DataMatrix它不是图像。

我的第一个想法是将页面转换为图像并使用DataMatrix裁剪区域并在解码后，但似乎（图像）结果已损坏，我无法正确解码。任何想法如何保持PDF的质量？

String sourceDir = "data/test2.pdf";

        File pdf = new File(sourceDir);

        PDDocument document = PDDocument.load(sourceDir); 

        List<PDPage> list = document.getDocumentCatalog().getAllPages();

        String key;
        for (PDPage page : list) {

            BufferedImage image = page.convertToImage(BufferedImage.TYPE_INT_RGB, 300);

            BufferedImage dest = image.getSubimage(0, 2600, 800, 800);

            File outputFile = new File( "data/test2.jpg");
            ImageIO.write(dest, "png", outputFile);

            LuminanceSource lumSource = new BufferedImageLuminanceSource (dest);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(lumSource));

            Hashtable<DecodeHintType, Object> hint = new Hashtable<DecodeHintType, Object>();
            hint.put(DecodeHintType.TRY_HARDER, BarcodeFormat.DATA_MATRIX);

            DataMatrixReader DMreader = new DataMatrixReader();

            try {

            Result result = DMreader.decode(bitmap, hint);

            System.out.println(result);

            }catch(Exception e){
                System.out.println("NO Data Matrix");

            }

                }


            }

版本2.0

  PDDocument document = PDDocument.load(new File(sourceDir));
        PDFRenderer pdfRenderer = new PDFRenderer(document);

        for (int page = 0; page < document.getNumberOfPages(); ++page)
        {
            BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(page, 600, ImageType.RGB);
            BufferedImage datamatrixImg = bufferedImage.getSubimage(150, 6000, 600, 900);

            File outputfile = new File("out/image_"+page+".jpg");
            ImageIO.write(datamatrixImg, "jpg", outputfile);

            LuminanceSource lumSource = new BufferedImageLuminanceSource(datamatrixImg);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(lumSource));

            Hashtable<DecodeHintType, Object> hint = new Hashtable<DecodeHintType, Object>();
            hint.put(DecodeHintType.TRY_HARDER, BarcodeFormat.DATA_MATRIX);

            DataMatrixReader DMreader = new DataMatrixReader();

            try {
                Result result = DMreader.decode(bitmap, hint);
                System.out.println("Decode: "+ result );
            } catch (Exception e) {
                System.out.println("No DataMatrix");
            }
        }
        document.close();