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https://issues.apache.org/jira/browse/TIKA-2846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16808893#comment-16808893
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Tim Allison commented on TIKA-2846:
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Thank you, again, [~tilman]!
> Add per page unicode mapping stats to the metadata in the PDFParser
> -------------------------------------------------------------------
>
> Key: TIKA-2846
> URL: https://issues.apache.org/jira/browse/TIKA-2846
> Project: Tika
> Issue Type: Task
> Reporter: Tim Allison
> Assignee: Tim Allison
> Priority: Major
> Fix For: 1.21
>
>
> As part of TIKA-2749, it would be useful to gather stats on characters that
> did not have a unicode mapping. Users could use this information now to
> determine which pages might benefit from OCR.
> I propose two parallel arrays of ints, with one entry per page. The first
> would contain the count of # of characters per page, and the second would be
> a count of the unmapped unicode characters per page.
> Many thanks to [~tilman] for the guidance on how to gather this info easily.
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