Indexing scanned PDFs

[Chandan Tamrakar <ch...@nepasoft.com>]

​we are using SOLr to index pdf documents but there are cases where PDFs
are usually a scanned document  with no text to extract and index .

Is there a plugin or module in SOLR that we can integrate so that it would
actually extract a text / OCR and then index?


Thanks in advance

Chandan Tamrakar

Re: Indexing scanned PDFs

[Jack Krupansky <ja...@basetechnology.com>]

Also, be aware that there a a lot of PDF files that have text which is the 
result of a low-accuracy OCR scan of the page images in the PDF file. 
High-accuracy OCR scan is rather expensive. You can usually tell if you have 
a "scanned" PDF by zooming way in - a PDF file generated directly from a 
word processor source file will retain smooth curves on characters while a 
PDF generated from scanned page images will show heavy pixelation.

-- Jack Krupansky

-----Original Message----- 
From: Alexandre Rafalovitch
Sent: Tuesday, May 6, 2014 1:30 AM
To: solr-user@lucene.apache.org
Subject: Re: Indexing scanned PDFs

Nothing I am aware of for Solr directly. You may have better luck
chasing this at TIKA mailing list, as that's what Solr uses under
covers to index PDF otherwise. Doing a quick search for Tika and OCR
brings up a number of links.

Regards,
  Alex.
Personal website: http://www.outerthoughts.com/
Current project: http://www.solr-start.com/ - Accelerating your Solr 
proficiency


On Tue, May 6, 2014 at 12:15 PM, Chandan Tamrakar
<ch...@nepasoft.com> wrote:
> we are using SOLr to index pdf documents but there are cases where PDFs
> are usually a scanned document  with no text to extract and index .
>
> Is there a plugin or module in SOLR that we can integrate so that it would
> actually extract a text / OCR and then index?
>
>
> Thanks in advance
>
> Chandan Tamrakar 

Re: Indexing scanned PDFs

[Alexandre Rafalovitch <ar...@gmail.com>]

Nothing I am aware of for Solr directly. You may have better luck
chasing this at TIKA mailing list, as that's what Solr uses under
covers to index PDF otherwise. Doing a quick search for Tika and OCR
brings up a number of links.

Regards,
  Alex.
Personal website: http://www.outerthoughts.com/
Current project: http://www.solr-start.com/ - Accelerating your Solr proficiency


On Tue, May 6, 2014 at 12:15 PM, Chandan Tamrakar
<ch...@nepasoft.com> wrote:
> we are using SOLr to index pdf documents but there are cases where PDFs
> are usually a scanned document  with no text to extract and index .
>
> Is there a plugin or module in SOLR that we can integrate so that it would
> actually extract a text / OCR and then index?
>
>
> Thanks in advance
>
> Chandan Tamrakar