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Date: Tue, 1 Dec 2015 20:56:11 +0000 (UTC)
From: "Tilman Hausherr (JIRA)" <jira@apache.org>
To: dev@pdfbox.apache.org
Message-ID: <JIRA.12907997.1445883409000.237292.1449003371004@Atlassian.JIRA>
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 <JIRA.12907997.1445883409311@arcas>
Subject: [jira] [Commented] (PDFBOX-3062) Text extraction and height
 different in 2.0
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    [ https://issues.apache.org/jira/browse/PDFBOX-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034552#comment-15034552 ] 

Tilman Hausherr commented on PDFBOX-3062:
-----------------------------------------

{quote}
BBox + CapHeight isn't reliable either. 
{quote}
How is it not reliable? Do you know of any files that get less tokens extracted?

{quote}
The BBox is fine, it's just not what you want it to be, i.e. a meaningful proxy for a glyph's visual bounds. {quote}
That's why CapHeight is used when the BBox isn't helpful.

{quote}
So are we going to solve that problem or not?{quote}
Don't know. The alternatives are:
- use BBox only: some files won't be extracted nicely
- use BBox + Capheight: more files will be extracted nicely, but the code will have 9 extra lines you don't like
- calculate a new BBox from actual glyphs: will make software slower, will delay release, may or may not be more reliable. (If a font subset has only non-capital glyphs, then the 1/2 of the "real bbox" would be too small)

> Text extraction and height different in 2.0
> -------------------------------------------
>
>                 Key: PDFBOX-3062
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3062
>             Project: PDFBox
>          Issue Type: Sub-task
>          Components: Text extraction
>    Affects Versions: 2.0.0
>            Reporter: Tilman Hausherr
>            Assignee: Tilman Hausherr
>             Fix For: 2.0.0
>
>         Attachments: 005021-reduced.pdf, PDFBOX-3062-H6NIYQXHLPGD3GI6SNIYINRAZBCDHUCB-reduced-marked-1.png, PDFBOX-3062-H6NIYQXHLPGD3GI6SNIYINRAZBCDHUCB-reduced.pdf, PDFBOX-3062-H6NIYQXHLPGD3GI6SNIYINRAZBCDHUCB.pdf, PDFBOX-3062-N2MOQ7YZICIYGTPLQJAWJ4HLN6CCEMHZ-reduced.pdf, garbled text 2.pdf
>
>
> AR:
> {code}
> WITH THE increasing complexity of optical modules,
> {code}
> 1.8:
> {code}
> WITH THE increasing complexity of optical modules,
> String[39.6,399.6 fs=1.0 xscale=29.888 height=20.114626 space=7.472 width=28.214272]W
> String[69.488,386.16 fs=1.0 xscale=9.963 height=6.5955067 space=2.49075 width=3.3176804]I
> String[72.80568,386.16 fs=1.0 xscale=9.963 height=6.5955067 space=2.49075 width=6.0873947]T
> String[78.893074,386.16 fs=1.0 xscale=9.963 height=6.5955067 space=2.49075 width=7.1932907]H
> String[90.71916,386.16 fs=1.0 xscale=9.963 height=6.5955067 space=2.49075 width=6.0873947]T
> String[96.80656,386.16 fs=1.0 xscale=9.963 height=6.5955067 space=2.49075 width=7.1932907]H
> {code}
> 2.0:
> {code}
> W
> ITH THE increasing complexity of optical modules,
> String[39.6,399.6 fs=1.0 xscale=29.888 height=9.584274 space=7.472 width=28.209717]W
> String[69.488,386.16 fs=1.0 xscale=9.963 height=3.194865 space=2.49075 width=3.3177567]I
> String[72.805756,386.16 fs=1.0 xscale=9.963 height=3.194865 space=2.49075 width=6.0858]T
> String[78.891556,386.16 fs=1.0 xscale=9.963 height=3.194865 space=2.49075 width=7.1949615]H
> String[90.719315,386.16 fs=1.0 xscale=9.963 height=3.194865 space=2.49075 width=6.0858]T
> String[96.805115,386.16 fs=1.0 xscale=9.963 height=3.194865 space=2.49075 width=7.1949615]H
> {code}


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