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sudo apt-get install tesseract-ocr-all

With this configuration, you can already extract data from your images !  

For that, just configure your jobs in MCF as usual and use the Tika included in Solr so you ned to choose the DatafariSolr output and NOT choose TikaEmbedded transformation connector.

And that's it, start the job and the OCRization will  be activated.

Remarks :

1. If you want to extract data from PDF, you need to do an additional step ie customize the file PDFParser.properties which is included in the tika-parsers.jar.
   Install Vim : 

   Code Block
   apt-get install vim

   
   Stop datafari :

   Code Block
   cd /opt/datafari/bin bash stop-datafari.sh

   
   Edit the jar :

   Code Block
   vim /opt/datafari/solr/solrcloud/FileShare/lib/extraction/tika-parsers*.jar

   
   Choose the file org/apache/tika/parser/pdf/PDFParser.properties and change the line ocrStrategy :

   Code Block
   ocrStrategy ocr_and_text_extraction

   
   Save your changes 
   Start Datafari :

   Code Block
   cd /opt/datafari/bin bash start-datafari.sh

   
   And as before, just start your jobs in MCF, the data extraction will be done for PDF content.
   
   
   

2. Customize the Tesseract configuration
   By default, Tesseract does the text extraction for English content. If you want to add other languages you need to edit the Tesseract configuration file located here : org/apache/tika/parser/ocr/TesseractOCRConfig.properties
   Install Vim : 

   Code Block
   apt-get install vim

   
   Stop datafari :

   Code Block
   cd /opt/datafari/bin bash stop-datafari.sh

   
   Edit the jar :

   Code Block
   vim /opt/datafari/solr/solrcloud/FileShare/lib/extraction/tika-parsers*.jar

   
   Choose the file org/apache/tika/parser/ocr/TesseractOCRConfig.properties and change the line language, if I want to add French language, the configuration will be :

   Code Block
   language=eng+fra

   
   Save your changes 
   Start Datafari :

   Code Block
   cd /opt/datafari/bin bash start-datafari.sh

   
   And as before, just start your jobs in MCF, the data extraction will be done for PDF content.