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https://issues.apache.org/jira/browse/PDFBOX-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated PDFBOX-1155:
---------------------------------------
Attachment: dedup.diffs.txt
000527.pdf
Example PDF document showing the problem. I suspect (not confirmed)
what's happening is the dedup logic sees the same character in the
line just above it and incorrectly removes it; if so, maybe the y
tolerance just needs to be tightened up?
Here are some example diffs (I also attached the full diffs); first
line is with setSuppressDuplicateOverlappingText disabled and second
line is with it enabled:
{noformat}
253c253
< Linux routine can safely be called from real-time tasks. However, some
communication
---
> Linux routine can safely be called from real-ti e t sks. However, some
> communication
326c326
< used chained jumps instead of subroutine calls because the latter would not
fully emulate
---
> used chained jumps instead of subroutine calls because the latter would not
> fully em ate
334c334
< level: interrupt emulation and real-time task construction, scheduling,
timing and
---
> level: interrupt emulation and real-tim task construction, scheduling,
> timing and
337c337
< scheduling helps us to run all kinds of real-time tasks in the right schedule
and thus meet
---
> scheduling helps us to run all kinds of real-time t sks in the right schedule
> and thus meet
{noformat}
> setSuppressDuplicateOverlappingText sometimes removes characters that it
> shouldn't
> ----------------------------------------------------------------------------------
>
> Key: PDFBOX-1155
> URL: https://issues.apache.org/jira/browse/PDFBOX-1155
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Reporter: Michael McCandless
> Priority: Minor
> Attachments: 000527.pdf, dedup.diffs.txt
>
>
> The duplicate detection (in PDFTextStripper.java) checks whether the
> same character was placed "nearish" to where we are about to place
> another and de-dups it if so; this is to catch documents that rewind
> and overwrite in order to bold word(s).
> But in some cases I see it removing valid characters (that were not
> dups).
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