Re: Tesseract language

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Re: Tesseract language

Tim Allison
Martin,
  Let’s move this over to user@tika.

Rohan,
  Is there something about Tika’s use of tesseract for image files that can be improved?  

    Best,
       Tim

On Sat, Oct 27, 2018 at 3:40 AM Rohan Kasat <[hidden email]> wrote:
I used tess4j for image formats and Tika for scanned PDFs and images within
PDFs.

Regards,
Rohan Kasat

On Sat, Oct 27, 2018 at 12:39 AM Martin Frank Hansen (MHQ) <[hidden email]>
wrote:

> Hi Rohan,
>
> Thanks for your reply, are you using tess4j with Tika or on its own?  I
> will take a look at tess4j if I can't make it work with Tika alone.
>
> Best regards
> Martin
>
>
> -----Original Message-----
> From: Rohan Kasat <[hidden email]>
> Sent: 26. oktober 2018 21:45
> To: [hidden email]
> Subject: Re: Tesseract language
>
> Hi Martin,
>
> Are you using it For image formats , I think you can try tess4j and use
> give TESSDATA_PREFIX as the home for tessarct Configs.
>
> I have tried it and it works pretty well in my local machine.
>
> I have used java 8 and tesseact 3 for the same.
>
> Regards,
> Rohan Kasat
>
> On Fri, Oct 26, 2018 at 12:31 PM Martin Frank Hansen (MHQ) <[hidden email]>
> wrote:
>
> > Hi Tim,
> >
> > You were right.
> >
> > When I called `tesseract testing/eurotext.png testing/eurotext-dan -l
> > dan`, I got an error message so I downloaded "dan.traineddata" and
> > added it to the Tesseract-OCR/tessdata folder. Furthermore I added the
> > 'TESSDATA_PREFIX' variable to the path-variables pointing to
> > "Tesseract-OCR/tessdata".
> >
> > Now Tesseract works with Danish language from the CMD, but now I can't
> > make the code work in Java, not even with default settings (which I
> > could before). Am I missing something or just mixing some things up?
> >
> >
> >
> > -----Original Message-----
> > From: Tim Allison <[hidden email]>
> > Sent: 26. oktober 2018 19:58
> > To: [hidden email]
> > Subject: Re: Tesseract language
> >
> > Tika relies on you to install tesseract and all the language libraries
> > you'll need.
> >
> > If you can successfully call `tesseract testing/eurotext.png
> > testing/eurotext-dan -l dan`, Tika _should_ be able to specify "dan"
> > with your code above.
> > On Fri, Oct 26, 2018 at 10:49 AM Martin Frank Hansen (MHQ)
> > <[hidden email]>
> > wrote:
> > >
> > > Hi again,
> > >
> > > Now I moved the OCR part to Tika, but I still can't make it work
> > > with
> > Danish. It works when using default language settings and it seems
> > like Tika is missing Danish dictionary.
> > >
> > > My java code looks like this:
> > >
> > > {
> > >             File file = new File(pathfilename);
> > >
> > >             Metadata meta = new Metadata();
> > >
> > >             InputStream stream = TikaInputStream.get(file);
> > >
> > >             Parser parser = new AutoDetectParser();
> > >             BodyContentHandler handler = new
> > > BodyContentHandler(Integer.MAX_VALUE);
> > >
> > >             TesseractOCRConfig config = new TesseractOCRConfig();
> > >             config.setLanguage("dan"); // code works if this phrase
> > > is
> > commented out.
> > >
> > >             ParseContext parseContext = new ParseContext();
> > >
> > >              parseContext.set(TesseractOCRConfig.class, config);
> > >
> > >             parser.parse(stream, handler, meta, parseContext);
> > >             System.out.println(handler.toString());
> > > }
> > >
> > > Hope that someone can help here.
> > >
> > > -----Original Message-----
> > > From: Martin Frank Hansen (MHQ) <[hidden email]>
> > > Sent: 22. oktober 2018 07:58
> <https://maps.google.com/?q=tober+2018+07:58&entry=gmail&source=g>
> > > To: [hidden email]
> > > Subject: SV: Tessera
> > <https://maps.google.com/?q=ect:+SV:+Tessera&entry=gmail&source=g>ct
> > language
> > >
> > > Hi Erick,
> > >
> > > Thanks for the help! I will take a look at it.
> > >
> > >
> > > Martin Frank Hansen, Senior Data Analytiker
> > >
> > > Data, IM & Analytics
> > >
> > >
> > >
> > > Lautrupparken 40-42, DK-2750 Ballerup E-mail [hidden email]  Web
> > > www.kmd.dk Mobil +4525571418
> > >
> > > -----Oprindelig meddelelse-----
> > > Fra: Erick Erickson <[hidden email]>
> > > Sendt: 21. oktober 2018 22:49
> > > Til: solr-user <[hidden email]>
> > > Emne: Re: Tesseract language
> > >
> > > Here's a skeletal program that uses Tika in a stand-alone client.
> > > Rip
> > the RDBMS parts out....
> > >
> > > https://lucidworks.com/2012/02/14/indexing-with-solrj/
> > > On Sun, Oct 21, 2018 at 1:13 PM Alexandre Rafalovitch <
> > [hidden email]> wrote:
> > > >
> > > > Usually, we just say to do a custom solution using SolrJ client to
> > > > connect. This gives you maximum flexibility and allows to
> > > > integrate Tika either inside your code or as a server. Latest Tika
> > > > actually has some off-thread handling I believe, to make it safer to
> embed.
> > > >
> > > > For DIH alternatives, if you want configuration over custom code,
> > > > you could look at something like Apache NiFI. It can push data
> > > > into
> > Solr.
> > > > Obviously it is a bigger solution, but it is correspondingly more
> > > > robust too.
> > > >
> > > > Regards,
> > > >    Alex.
> > > > On Sun, 21 Oct 2018 at 11:07, Martin Frank Hansen (MHQ)
> > > > <[hidden email]>
> > wrote:
> > > > >
> > > > > Hi Alexandre,
> > > > >
> > > > > Thanks for your reply.
> > > > >
> > > > > Yes right now it is just for testing the possibilities of Solr
> > > > > and
> > Tesseract.
> > > > >
> > > > > I will take a look at the Tika documentation to see if I can
> > > > > make it
> > work.
> > > > >
> > > > > You said that DIH are not recommended for production usage, what
> > > > > is
> > the recommended method(s) to upload data to a Solr instance?
> > > > >
> > > > > Best regards
> > > > >
> > > > > Martin Frank Hansen
> > > > >
> > > > > -----Oprindelig meddelelse-----
> > > > > Fra: Alexandre Rafalovitch <[hidden email]>
> > > > > Sendt: 21. oktober 2018 16:26
> > > > > Til: solr-user <[hidden email]>
> > > > > Emne: Re: Tesseract language
> > > > >
> > > > > There is a couple of things mixed in here:
> > > > > 1) Extract handler is not recommended for production usage. It
> > > > > is
> > great for a quick test, just like you did it, but going to production,
> > running it externally is better. Tika - especially with large files
> > can use up a lot of memory and trip up the Solr instance it is running
> within.
> > > > > 2) If you are still just testing, you can configure Tika within
> > > > > Solr
> > but specifying parseContent.config file as shown at the link and
> > described further down in the same document:
> > > > > https://lucene.apache.org/solr/guide/7_5/uploading-data-with-sol
> > > > > r-
> > > > > ce
> > > > > ll-using-apache-tika.html#configuring-the-solr-extractingrequest
> > > > > ha nd ler You still need to check with Tika documentation with
> > > > > Tesseract can take its configuration from the parseContext file.
> > > > > 3) If you are still testing with multiple files, Data Import
> > > > > Handler
> > can iterate through files and then - as a nested entity - feed it to
> > Tika processor for further extraction. I think one of the examples shows
> that.
> > > > > However, I am not sure you can pass parseContext that way and
> > > > > DIH is
> > also not recommended for production.
> > > > >
> > > > > I hope this helps,
> > > > >     Alex.
> > > > >
> > > > > On Sun, 21 Oct 2018 at 09:24, Martin Frank Hansen (MHQ)
> > > > > <[hidden email]>
> > wrote:
> > > > >
> > > > > > Hi again,
> > > > > >
> > > > > >
> > > > > >
> > > > > > Is there anyone who has some experience of using Tesseract’s
> > > > > > OCR module within Solr? The files I am trying to read into
> > > > > > Solr is Danish Tiff documents.
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > *Martin Frank Hansen*, Senior Data Analytiker
> > > > > >
> > > > > > Data, IM & Analytics
> > > > > >
> > > > > > [image: cid:image001.png@01D383C9.6C129A60]
> > > > > >
> > > > > >
> > > > > > Lautrupparken 40-42, DK-2750 Ballerup E-mail [hidden email]  Web
> > > > > > www.kmd.dk Mobil +4525571418
> > > > > >
> > > > > >
> > > > > >
> > > > > > *Fra:* Martin Frank Hansen (MHQ) <[hidden email]>
> > > > > > *Sendt:* 18. oktober
> <https://maps.google.com/?q=t:*+18.+oktober+&entry=gmail&source=g>2018
> 13:30
> > > > > > *Til:* [hidden email]
> > > > > > *Emne:* Tesseract language
> > > > > >
> > > > > >
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > I have been trying to use Tesseract through the
> > > > > > data-import-handler in Solr and it actually works very well –
> > > > > > with English. As the documents are in Danish, I need to change
> > > > > > the language setting in Tesseract to
> > <https://maps.google.com/?q=in+Tesseract+to+&entry=gmail&source=g>Dani
> > sh
> > as well, is that possible from Solr?
> > > > > >
> > > > > >
> > > > > >
> > > > > > I was using the update/extract-handler to import single files
> > > > > > into Solr, and it worked for a single file, how would I
> > > > > > implement several files from a file-system?
> > > > > >
> > > > > >
> > > > > >
> > > > > > Here is the request-handler I used:
> > > > > >
> > > > > >
> > > > > >
> > > > > > <requestHandler name="/update/extract"
> > > > > >
> > > > > >                   startup="lazy"
> > > > > >
> > > > > >
>  class="solr.extraction.ExtractingRequestHandler"
> > > > > > >
> > > > > >
> > > > > >     <lst name="defaults">
> > > > > >
> > > > > >       <str name="lowernames">false</str>
> > > > > >
> > > > > >       <str name="uprefix">ignored_</str>
> > > > > >
> > > > > >       <str name="captureAttr">true</str>
> > > > > >
> > > > > >     </lst>
> > > > > >
> > > > > >   </requestHandler>
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > *Martin Frank Hansen*, Senior Data Analytiker
> > > > > >
> > > > > > Data, IM & Analytics
> > > > > >
> > > > > > [image: cid:image001.png@01D383C9.6C129A60]
> > > > > >
> > > > > >
> > > > > > Lautrupparken 40-42, DK-2750 Ballerup E-mail [hidden email]  Web
> > > > > > www.kmd.dk Mobil +4525571418
> > > > > >
> > > > > >
> > > > > >
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> --
>
> *Regards,Rohan Kasat*
>
--

*Regards,Rohan Kasat*