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https://issues.apache.org/jira/browse/PDFBOX-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874369#comment-17874369
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Tilman Hausherr edited comment on PDFBOX-5868 at 8/16/24 7:06 PM:
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There is a problem that I didn't notice immediately, the spaces are incorrect.
This is the new extraction:
वा री फेरी बलि गई, जि त देखौं ति त तूँ ॥
This what it should have been:
वारी फेरी बलि गई, जित देखौं तित तूँ ॥
The reason seems to be that the glyphs where I remove the unicode have no width
(I have to investigate why), so the stripper thinks there is a space.
!screenshot-2.png!
was (Author: tilman):
There is a problem that I didn't notice immediately, the spaces are incorrect.
This is the new extraction:
वा री फेरी बलि गई, जि त देखौं ति त तूँ ॥
This what it should have been:
वारी फेरी बलि गई, जित देखौं तित तूँ ॥
The reason seems to be that the glyphs where I remove the unicode have no
length (I have to investigate why), so the stripper thinks there is a space.
!screenshot-2.png!
> PDFBox not extracting text of non-latin languages(tamil, bengali) properly
> but adobe reader's save as text does
> ---------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5868
> URL: https://issues.apache.org/jira/browse/PDFBOX-5868
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 3.0.3 PDFBox
> Environment: Ubuntu 22.04.4 LTS x86_64
> Reporter: Manish S N
> Priority: Major
> Attachments: Main.java, Tilman's_solution_out.txt, adobe_out.txt,
> multilingual_test.pdf, okular_out.txt, pdfbox_out.txt, poppler_out.txt,
> screenshot-1.png, screenshot-2.png
>
>
> I downloaded the latest executable jar of pdfbox (3.0.3) for testing and used
> the export:text command line tool to obtain the results
> * the multilingual_test.pdf is the original pdf i made to test multilingual
> text extraction.
> * the pdfbox_out.txt is the text file produced by pdfbox
> * the adobe_out.txt is the text file created by adobe reader's save as text
> feature
>
> Observation:
> as you can see in the attachment the text file obtained by pdfbox shows weird
> unicodes for tamil and bengali (for hindi the charecters are extracted but
> not overlapped; japanese seems fine to me). in contrast the text file file
> obtained from adobe reader's save as text feature seems fine and copy pasting
> the text from my document viewer(evince) also works.
> Questions:
> # why are the outputs from pdfbox and adobe different?
> # what can i do to extract the text from a multilingual pdf correctly?
> # Is there a way to apply pattern matching to text in pdf file and declare
> matches without extracting the text first? (say if the problem is with fonts
> and glyphs)
> —
> My Usecase fyi:
> i am trying to extract text from files and run pattern matching. I am using
> apache tika for parsing documents. I noticed problem with extracted PDF text
> (other filetypes parse fine). used executable pdfbox jar to conclude that the
> _problem is in pdfbox and not in tika._ tested with adobe reader's extract
> text to confirm the problem is not with the pdf. i want to extract these
> multilingual text to run pattern matching on them alone and do not need to
> display the content but only if the pattern is present or not (say if the
> problem is with fonts and glyphs)
>
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