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https://issues.apache.org/jira/browse/PDFBOX-6020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17968811#comment-17968811
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Markus Seifert commented on PDFBOX-6020:
----------------------------------------
Just saw, that the PDF is split into single pages and some processing is done
on it (e.g. merge of separated words, detection of sub/sup/bold/italic).
Attached is a PDF with 'reembedded' text information. And with that one the
line feed-problem can be reproduced. Sorry for initially pointing to a ‚wrong‘
PDF. I used the following code to test it:
public static void main(String[] args) throws IOException {
try (PDDocument pdfDoc = Loader.loadPDF(new
File("DE102016007628A1-Page2.pdf"))) {
System.out.println(new
PDFTextStripper().getText(pdfDoc));
}
}
With lines 681-682 in PDFTextStripper as 'if (Math.abs(position.getX() -
lastPosition.getTextPosition().getX()) > (wordSpacing + deltaSpace))' we have a
line feed in front of '3–'. And when changing it to 'if
(Math.abs(position.getX() - (lastPosition.getTextPosition().getX() +
lastPosition.getTextPosition().getWidth())) > (wordSpacing + deltaSpace))' the
line feed disappears.
> mix of subscript and superscript can lead to unnecessary new lines during
> text extraction
> -----------------------------------------------------------------------------------------
>
> Key: PDFBOX-6020
> URL: https://issues.apache.org/jira/browse/PDFBOX-6020
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 3.0.5 PDFBox
> Reporter: Markus Seifert
> Priority: Minor
> Attachments: DE102016007628A1-Page2.pdf,
> PDFBOX-6020-DE102016007628A1-p2-219.txt,
> PDFBOX-6020-DE102016007628A1-p2-305.txt, PDFBOX-6020-DE102016007628A1-p2.pdf
>
>
> I'm currently upgrading our usage of PDFBox from Version 2.0.19 to 3.0.5.
> Worked out fine so far but one of our JUnit-Tests failed with the new
> version. During text extraction by using PDFTextStripper unnecessary line
> feeds were created for a line, that contained subscript as well as
> superscript text. While debugging the issue I found some changes that were
> made in Methode PDFTextStripper.writePage(). I think maxYForLine,
> maxHeightForLine and minYTopForLine, which are used for the overlap-check,
> are reset too often.
>
> There's a check made with the value of 'Math.abs(position.getX() -
> lastPosition.getTextPosition().getX())'. But I think is might have to be
> changed to 'Math.abs(position.getX() - (lastPosition.getTextPosition().getX()
> + lastPosition.getTextPosition().getWidth()))' to find relevant gaps.
>
> An example-PDF can be downloaded from
> [here|https://patentimages.storage.googleapis.com/57/b2/2f/3b5ffe86d83ef5/DE102016007628A1.pdf]
>
> The text-line we had problems with was on page 2: 'gin-Anion
> (12-Wolframato-1-phosphat) kann durch die Summenformel [P(W12O40)]3-
> beschrieben werden oder'.
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