Hi,
we want to create the structure to an existing PDF document. We have PDF
documents from a scanner which contains Images but no structure.
We want to implement a program to create the structure so we can add
AlternateDescriptions to the images based on tesaract ocr recognition.
Our first approach creates a structure but the structure seems to be incomplete
when checking it with adobe acrobat. We can't find any hints in the pdfbox
examples
or documentation how to do this.
Our Code snippet:
try {
PDDocument document = PDDocument.load("test.pdf");
PDDocumentCatalog documentCatalog =
document.getDocumentCatalog();
PDStructureTreeRoot treeRoot =
document.getDocumentCatalog().getStructureTreeRoot();
if(treeRoot == null){
COSDictionary cosDictionary =
documentCatalog.getCOSDictionary();
PDStructureTreeRoot newTreeRoot = new
PDStructureTreeRoot();
//iterate over pages
List<?> pages = documentCatalog.getAllPages();
for (Object object : pages) {
PDPage page = (PDPage) object;
Map<String,PDXObject> mapObjects =
page.getResources().getXObjects();
for (PDXObject pdxObject :
mapObjects.values()) {
if(pdxObject instanceof PDXObjectImage){
PDXObjectImage objectImage =
(PDXObjectImage)pdxObject;
//new SturctureElement for the
image
PDStructureElement
structureElement = new
PDStructureElement(StandardStructureTypes.Figure,newTreeRoot);
PDMarkedContent markedContent =
new PDMarkedContent(COSName.IMAGE, new COSDictionary());
markedContent.addXObject(objectImage);
structureElement.appendKid(markedContent);
structureElement.setAlternateDescription("NEW ALTERNATE DESCRIPTION");
newTreeRoot.appendKid(structureElement);
}
}
}
documentCatalog.setStructureTreeRoot(newTreeRoot);
treeRoot = documentCatalog.getStructureTreeRoot();
}
document.save("testWithTree.pdf");
document.close();
}
catch (IOException e) {
e.printStackTrace();
}
catch (COSVisitorException e) {
e.printStackTrace();
}
Can someone help us her?
Best regards,
Klaus Henning
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