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https://issues.apache.org/jira/browse/TIKA-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17314454#comment-17314454
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Shmuel Krakower commented on TIKA-3258:
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Hi [~tallison]
This is my first comment in the TIKA project and hope that's the appropriate
place. If not plz lmk of the right place.
I know this is already done but you mentioned earlier in this ticket the
purpose here to have some discussion.
I was wondering regarding the point you mention in the ticket description:
{quote}
_option 2, which renders each page and then runs OCR on that composite image
rather than running OCR on each inline image...so we'll only call tesseract
once per page._
{quote}
I notice that when running with OCR_AND_TEXT_EXTRACTION mode (I assume the same
goes for AUTO, in the mentioned cases) - the entire page is rendered and then
OCRed but also each of the images is being OCRed.
If that's expected, I wonder why? (I was expecting that if a page is being
rendered for OCR, there's no need for also OCRing the embedded images, but
maybe there's a good reason for that)
> Run OCR on PDFs with 'auto' mode as default in Tika 2.0.0
> ---------------------------------------------------------
>
> Key: TIKA-3258
> URL: https://issues.apache.org/jira/browse/TIKA-3258
> Project: Tika
> Issue Type: Improvement
> Reporter: Tim Allison
> Assignee: Tim Allison
> Priority: Major
> Fix For: 2.0.0
>
>
> In Tika 1.x we currently have the fiddly mess that users have to configure
> OCR of PDFs...it doesn't just work out of the box. We did this initially
> because of concerns (well, reality) of crazy resource consumption for some
> PDFs that can have thousands of images per page that are stitched together to
> make a reasonable composite.
> Since then, we've added option 2, which renders each page and then runs OCR
> on that composite image rather than running OCR on each inline image...so
> we'll only call tesseract once per page. Second, we've added an 'auto' mode
> that runs OCR only on pages that didn't have much text extracted. While
> there is plenty of room for improvement in the 'auto' heuristic, I think we
> should move to running OCR automatically on PDFs as default in 2.0.0.
> Under this proposal, users will now have to disable OCR if they have
> tesseract installed but don't want to run it on PDFs.
> This will be a breaking change, and we'll make sure to document it early and
> often in the "Breaking Changes" sections of the readme.txt.
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