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https://issues.apache.org/jira/browse/PDFBOX-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14933277#comment-14933277
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Andreas Meier commented on PDFBOX-2252:
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I have already studied one of the two papers you posted and did some tests with
lapdftext a week ago.
(using the PDFTextStripperByArea.java and lapdftext 1.7.2-SNAPSHOT)
The results were pretty good and lapdftext would be the tool of choice in my
opinion
Unfortunately I also discovered that it relies on Java 1.6, any other Java
Version breaks the dependencies and will not work.
That's the reason, why I mentioned the "specific Java Version" in my post.
The layout analysis algorithm of lapdftext combined with pdfbox would be
amazing.
I have not taken an in-depth look at papers or the lapdftext-code, but I guess
it would be hard work to re-code the algorithm.
I have created https://issues.apache.org/jira/browse/PDFBOX-2998
> PDFTextStripper has problem with documents with mixed language directions
> -------------------------------------------------------------------------
>
> Key: PDFBOX-2252
> URL: https://issues.apache.org/jira/browse/PDFBOX-2252
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 1.8.6, 2.0.0
> Reporter: Amir
> Assignee: Maruan Sahyoun
> Priority: Critical
> Fix For: 2.1.0
>
> Attachments: BidiMirroring.txt, IsMirroredDeviations.txt,
> PDFTextStripper-201709271718.patch, PDFTextStripper-201709272018.patch,
> PDFTextStripper.java.patch, PDFTextStripper.java.patch, atest.pdf,
> bugzilla867751.pdf, overlap.jpg, test.pdf, wikipedia_dl_lyric_test.pdf
>
>
> When the input document of PDFTextStripper is a combination of right-to-left
> and left-to-right languages, the output characters of one language is
> reversed.
> A sample bilingual pdf document is attached.
> PDFTextStripper has a variable "isRtlDominant" in "writePage" function, which
> is defined as follows: boolean isRtlDominant = rtlCount > ltrCount;
> This class clearly count the number of rtl characters and decide if the whole
> content should be revered or not. It's not true, it must operate on each
> word, not the whole document.
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