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Date: Tue, 18 Aug 2009 09:23:14 -0700 (PDT)
From: =?utf-8?Q?Andreas_Lehmk=C3=BChler_=28JIRA=29?= <jira@apache.org>
To: pdfbox-dev@incubator.apache.org
Subject: [jira] Updated: (PDFBOX-234) spaces lost
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     [ https://issues.apache.org/jira/browse/PDFBOX-234?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andreas Lehmk=C3=BChler updated PDFBOX-234:
--------------------------------------

    Fix Version/s: 0.8.0-incubator

> spaces lost
> -----------
>
>                 Key: PDFBOX-234
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-234
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Text extraction
>            Priority: Minor
>             Fix For: 0.8.0-incubator
>
>
> [imported from SourceForge]
> http://sourceforge.net/tracker/index.php?group_id=3D78314&atid=3D552832&a=
id=3D1635950
> Originally submitted by tweakerbee on 2007-01-15 07:09.
> During extraction in certain PDF documents spaces will be lost. I have at=
tached a file in which this problem occurs.
> Here PDFTextStripper.getText() returns:
> gaandeofincidenteleaardis
> whereas it should be
> gaande of incidentele aard is
> I have used the nightly build from today (15-01-07) but the problem still=
 remains.
> [attachment on SourceForge]
> http://sourceforge.net/tracker/download.php?group_id=3D78314&atid=3D55283=
2&aid=3D1635950&file_id=3D211376
> STB336.pdf (application/pdf), 51425 bytes
> document with erronous text extraction
> [comment on SourceForge]
> Originally sent by tweakerbee.
> Logged In: YES=20
> user_id=3D1625706
> Originator: YES
> The problem turned out to be in the splitting algorithm. The values here =
turned out slightly too conservative.
> Using 0.33f (33%) turned out to yield proper results. This might split wo=
rds that are not meant to be split, however.
> Maybe you could set this through a field in the TextStripper? So you can =
adjust your application slightly easier to your specific needs.
> This issue can be considered solved.
> startOfNextWordX =3D endOfLastTextX + (wordSpacing* 0.33f);
> startOfNextWordX =3D endOfLastTextX + (((wordSpacing+lastWordSpacing)/2f)=
* 0.33f);
> [comment on SourceForge]
> Originally sent by tweakerbee.
> Logged In: YES=20
> user_id=3D1625706
> Originator: YES
> My previous assumption turned out to be incorrect.
> The context.showString() function is responsible for outputting the strin=
g. If anywhere, it should probably output the space here.
> [comment on SourceForge]
> Originally sent by tweakerbee.
> Logged In: YES=20
> user_id=3D1625706
> Originator: YES
> I am currently looking into the problem myself as well, but my complete l=
ack of experience with the Portable Document Format as well as being a novi=
ce Java programmer are rather limiting.
> What I have found out so far is this:
> The problem is in the TextStream where a TJ operator is being used to sho=
w the glyphs. There are no spaces encoded in the file, but instead it uses =
some character spacing information to space out the words. An example is in=
cluded below.
> The code I believe is responsible for extracting the text here (org.pdfbo=
x.util.operator.ShowTextGlyph) does not contain any code to determine wheth=
er or not a space is needed. Would it be useful to add this here? And will =
this not breakdown the org.pdfbox.util.PDFHighlighter? (I have noticed some=
 difficulties with certain PDF documents and I wouldn't be surprised if the=
 difference in character count originates from this issue.)
> Any help would be greatly appreciated.
> Example code in STB336.pdf:
> [(7?????)-278(???)-278(? ?"&????)-278(???)-278(???)-278( ??\))-278(???)-2=
78(??????\)????\012)-278( ?????'??&)-278(??)]TJ

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