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https://issues.apache.org/jira/browse/PDFBOX-2998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15042460#comment-15042460
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John Logan commented on PDFBOX-2998:
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Not sure whether this is a great place to put this comment, but I was having a
look at the text extraction bugs and saw the general discussion.
One area that could be improved with a little effort is in parameter selection
for paragraph detection. I put together a POC of this as this solving this
problem helps me out a lot.
What I did was create an analyzer, based on the PDFTextStripper code, that
stores the collection of drops and indents for a page, and then applies a crude
heuristic to determine reasonable threshold values. It appears to function
pretty well for the test cases I have where the embedded default values are too
low.
>From an implementation standpoint the solution is wanting because it's not
>very DRY. I originally implemented the solution directly in PDFTextStripper
>using a two pass scan, but that makes an already complicated method even more
>so.
> Enhance the text extraction capabilities
> ----------------------------------------
>
> Key: PDFBOX-2998
> URL: https://issues.apache.org/jira/browse/PDFBOX-2998
> Project: PDFBox
> Issue Type: Improvement
> Components: Text extraction
> Affects Versions: 2.0.0
> Reporter: Andreas Meier
> Attachments: DropCapExample1.pdf, DropCapExample2.pdf,
> DropCapExample3.pdf, DropCapExample4.pdf, DropCapExample5.pdf,
> DropCapSegmentation.jpg, TextBehindText.pdf
>
>
> PDFBox will need some -document layout analysis tools- enhancement to the
> current text extraction to extract text correctly.
> At the Moment the text of a document is extracted using the position of
> single characters.
> This may lead to wrong results, due to the format of the file.
> There are good tools such as https://code.google.com/p/lapdftext which we
> could use to compare our current output.
> Possible enhancements are
> - enhance matching of text to a certain line i.e. don't mix up text from
> different lines
> - better handling of rotated text
> - handling of vertical text
> - ability to get additional text properties such as font, font size ...
> Some of these are already logged as individual tickets
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