[
https://issues.apache.org/jira/browse/TIKA-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15313422#comment-15313422
]
Luis Filipe Nassif edited comment on TIKA-1994 at 6/3/16 1:09 AM:
------------------------------------------------------------------
Hi Tim,
Before the PDFBox deeper integration (good to know they are working on that!),
I think this strategy is very good, and currently we use it in my organization
instead of OCRing individual images inside a pdf. As you know, PDFs may have
one image per paragraph, line, word or per char, and that can result in poor
results with the individual image ocr approach.
As a suggestion, we count the number of extracted text chars per page and only
do ocr if it is lower than a configurable value (we use 100 by default),
because it suggests a high chance that the page is formed by a big (scanned)
image. That eliminates lots of duplicate info that would be returned by ocr and
speeds up the extraction a lot.
was (Author: lfcnassif):
Hi Tim,
Before the PDFBox deeper integration (good to know they are working on that!),
I think this strategy is very good, and currently we use it in my organization
instead of OCRing individual images inside a pdf. As you know, PDFs may have
one image per paragraph, line, word or per char, and that can result in poor
results with the individual image ocr approach.
As a suggestion, we count the number of extracted text chars per page and only
do ocr if it is lower than a configurable value (we use 100 by default). That
eliminates lots of duplicate info that would be returned by ocr and speeds up
the extraction a lot.
> Integrate OCR with PDFParser
> ----------------------------
>
> Key: TIKA-1994
> URL: https://issues.apache.org/jira/browse/TIKA-1994
> Project: Tika
> Issue Type: Improvement
> Reporter: Tim Allison
> Assignee: Tim Allison
>
> Users can now run OCR on individual images embedded inline in PDFs if they
> get the configuration right.
> There are some drawbacks: 1) the text appears as an attachment if using the
> RecursiveParserWrapper, 2) text may be more cleanly extracted on the fully
> rendered page instead of on the individual images (this is still tbd).
> It might be useful to run OCR against each rendered page (instead of the
> component images).
> Integrating OCR is on the roadmap for PDFBox 2.1 (PDFBOX-1912). This will
> allow us to experiment with strategies until the cleaner integration is
> available with PDFBox 2.1.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
