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https://issues.apache.org/jira/browse/PDFBOX-3833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056369#comment-16056369
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Tilman Hausherr commented on PDFBOX-3833:
-----------------------------------------
The cause of the problem is that the "ー" slightly overlaps with the next glyph.
The code from PDFTextStripper then thinks they belong together:
{code:java}
TextPosition previousTextPosition = textList.get(textList.size() - 1);
if (text.isDiacritic() && previousTextPosition.contains(text))
{
previousTextPosition.mergeDiacritic(text);
}
// If the previous TextPosition was the diacritic, merge it into this
// one and remove it from the list.
else if (previousTextPosition.isDiacritic() &&
text.contains(previousTextPosition))
{
text.mergeDiacritic(previousTextPosition);
textList.remove(textList.size() - 1);
textList.add(text);
}
else
{
textList.add(text);
}
{code}
{{TextPosition.contains()}} allows an overlap of 15%. I had to set it to 25%
for the extraction to work properly.
Another solution would be have {{isDiacritic()}} return false for "ー".
> Characters in wrong order
> -------------------------
>
> Key: PDFBOX-3833
> URL: https://issues.apache.org/jira/browse/PDFBOX-3833
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.5
> Reporter: Christopher Creutzig
> Attachments: ML_mathworks_unc2.pdf, PDFBOX-3833-reduced.pdf
>
>
> The attached pdf file (which is page 3 of
> https://jp.mathworks.com/tagteam/89688_93050v00_JP_machine_learning_section1_ebook.pdf)
> shows multiple problems when reading with PDFBox in standard settings. This
> bug report in particular is about the Katakana ー being misplaced.
> In the text block on the left, the second line starts with ターン.
> PDFTextStripper.getText returns text starting with タ ンー (i.e., adding a space
> after the first character and swapping the second and third one). This effect
> also happens at other places in the (complete) file.
> The PDF itself at this point has [<03BB>43.9 <0294>156 <03EF>-24.5 ...]TJ,
> listing the characters in the proper order. Copy&paste using Apple's
> Preview.App also preserves that order.
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