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https://issues.apache.org/jira/browse/PDFBOX-349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689932#action_12689932
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Justin LeFebvre edited comment on PDFBOX-349 at 3/27/09 9:53 AM:
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For this patch I worked with Brian Carrier.
With the attached fix, Brian and I have made spacing detection better for files
such as this one where the page was scanned in a bit skewed. Now, instead of
just relying on the reported width of the space character to determine if a
space should be added to the text file. PDFBox still has that, but it also
keeps a running average of the character widths seen previously. In order to
determine if a space should be added, it compares the two widths,picks the
smaller one, and adds it to our previous X position to show where we expect the
next word to start. If the expected X position is less that our new X position,
then we add a space.
was (Author: justinl):
With the attached fix, I have made spacing detection better for files such
as this one where the page was scanned in a bit skewed. Now, instead of just
relying on the reported width of the space character to determine if a space
should be added to the text file. PDFBox still has that, but it also keeps a
running average of the character widths seen previously. In order to determine
if a space should be added, it compares the two widths,picks the smaller one,
and adds it to our previous X position to show where we expect the next word to
start. If the expected X position is less that our new X position, then we add
a space.
> Spaces between words ignored in scanned pdf files
> -------------------------------------------------
>
> Key: PDFBOX-349
> URL: https://issues.apache.org/jira/browse/PDFBOX-349
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Reporter: Jukka Zitting
> Attachments: SpacingFix.zip, UpdatedSpacingRegressionFiles.zip
>
>
> [Issue from SourceForge]
> http://sourceforge.net/tracker/index.php?func=detail&aid=1922502&group_id=78314&atid=552832
> I am using PDF-Box-0.7.3.dll with C# and have tested extraction on two
> searchable pdfs that I have scanned in from paper. Spaces between words are
> ignored for both files. I have also tested another pdf file (which I
> downloaded from the internet) and it was parsed correctly. Unfortunately,
> the file is 1.2MB and the upload was blocked. Please send me an email
> (gkobz...@hotmail.com) and I will reply back with the file.
> Thanks for looking into this.
> Greg
> [Comment on SourceForge]
> Date: 2008-03-23 21:24
> Sender: gkobzeff
> Logged In: YES
> user_id=2042611
> Originator: YES
> I have scanned the file into a smaller file size. I have attached the
> file.
> Thanks
> File Added: Advanced Pain Mgmt BW.pdf
> http://sourceforge.net/tracker/download.php?group_id=78314&atid=552832&file_id=271548&aid=1922502
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