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https://issues.apache.org/jira/browse/PDFBOX-582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851934#action_12851934
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Maruan Sahyoun commented on PDFBOX-582:
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Hi - the issue with that document - and with others e.g. created by Adobe
Acrobat - is that they use text rendering "Neither fill nor stroke text
(invisible)." As we currently do not support that but fall back to text
rendering "Fill text." the text is visible.
I'm already working on a patch a patch which implements the missing text
rendering
> Ignoring text over images
> -------------------------
>
> Key: PDFBOX-582
> URL: https://issues.apache.org/jira/browse/PDFBOX-582
> Project: PDFBox
> Issue Type: Improvement
> Components: Text extraction, Utilities
> Affects Versions: 0.8.0-incubator
> Reporter: Villu Ruusmann
> Attachments: pg_0005.pdf, pg_0005.png
>
>
> Scientific publishers often publish older articles (year 2000 and earlier) in
> scanned form. However, sometimes they seem to have conducted OCR, and added
> the recovered text as an overlay in order to give the end user a "native PDF"
> feeling in a sense that it is possible to copy and paste text.
> PDFBox differs from other PDF viewers (tested with Adobe Acrobat Reader 7.0,
> Foxit Reader 3.1, iText 2.1) so that it tries to render both the image part
> and the textual overlay part, which may produce confusing results.
> Actually, there are two separate cases:
> *) Page rendering (class org.apache.pdfbox.pdfviewer.PageDrawer): Render the
> image part and ignore the text part.
> *) Text extraction (class org.apache.pdfbox.util.PDFTextStripper): Ignore the
> image part and work upon the text part.
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