tesseract ocr parser within tika

steps

1. install

    $ brew install tesseract --all-languages --with-serial-num-pack
    Installing dependencies for tesseract: autoconf, autoconf-archive, automake, leptonica
    ...
    Warning: tesseract: --all-languages was deprecated; using --with-all-languages instead!
    ...
   

2. using tika and tesseract

   1. use tesseract

       $ tesseract -psm 3 /path/to/tiff/file.tiff out.txt
       $ cat out.txt
      

   2. use tika

       $ tika -t /path/to/tiff/file.tiff
      

3. using tika server and tesseract

   1. start tika server

       $ java -jar /path/to/tika-server-1.7-SNAPSHOT.jar
      

   2. curl request

       $ curl -T /path/to/tiff/file.tiff http://localhost:9998/tika --header "Content-type: image/tiff"
      

   3. using different language models

       # single language
       $ curl -T /path/to/tiff/image.jpg http://localhost:998/tika --header "X-Tika-OCRLanguage: eng"
       # multiple languages
       $ curl -T /path/to/tiff/image.jpg http://localhost:998/tika --header "X-Tika-OCRLanguage: eng+fra"
      

4. docker-tikaserver Dockerfile on github

   1. pull

       $ docker pull logicalspark/docker-tikaserver
      

   2. run

       $ docker run --rm -d -p 9998:9998 logicalspark/docker-tikaserver
      

5. command-line usage

   1. set TESSDATA_PREFIX

       $ cd /usr/local/Cellar/tesseract/3.05.00/share/tessdata
       $ export TESSDATA_PREFIX="`pwd`"
      

   2. chi_sim

       $ tesseract ./test.png ./test -l chi_sim
       Tesseract Open Source OCR Engine v3.05.00 with Leptonica
       $ cat text.txt
       ...
       orc output of test.png file
       ...
      

6. running the tika server

   1. java -jar

       $ java -jar tika-server-1.14.jar
       ...
      

   2. change host name and port number

       $ java -jar tika-server-1.14.jar --host=intranet.local --port=9999
       Mar 09, 2017 9:35:55 AM org.apache.tika.server.TikaServerCli main
       INFO: Starting Apache Tika 1.14 server
       Mar 09, 2017 9:35:56 AM org.apache.cxf.endpoint.ServerImpl initDestination
       INFO: Setting the server's publish address to be http://localhost:9999/
       Mar 09, 2017 9:35:56 AM org.slf4j.impl.JCLLoggerAdapter info
       INFO: jetty-8.y.z-SNAPSHOT
       Mar 09, 2017 9:35:56 AM org.slf4j.impl.JCLLoggerAdapter info
       INFO: Started SelectChannelConnector@localhost:9999
       Mar 09, 2017 9:35:56 AM org.apache.tika.server.TikaServerCli main
       INFO: Started
      

   3. visit http://localhost:9999/

       Welcome to the Apache Tika 1.14 Server
      
       For endpoints, please see https://wiki.apache.org/tika/TikaJAXRS and http://tika.apache.org/1.14/miredot/index.html
      
       PUT /detect/stream
       Class: org.apache.tika.server.resource.DetectorResource
       Method: detect
       Produces: text/plain
       GET /detectors
       Class: org.apache.tika.server.resource.TikaDetectors
       Method: getDectorsHTML
       Produces: text/html