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COMBINE_TESSDATA(1)                                        COMBINE_TESSDATA(1)

NAME
       combine_tessdata - combine/extract/overwrite Tesseract data

SYNOPSIS
       combine_tessdata [OPTION] FILE...

DESCRIPTION
       combine_tessdata(1) is the main program to combine/extract/overwrite
       tessdata components in [lang].traineddata files.

       To combine all the individual tessdata components (unicharset, DAWGs,
       classifier templates, ambiguities, language configs) located at, say,
       /home/$USER/temp/eng.* run:

           combine_tessdata /home/$USER/temp/eng.

       The result will be a combined tessdata file
       /home/$USER/temp/eng.traineddata

       Specify option -e if you would like to extract individual components
       from a combined traineddata file. For example, to extract language
       config file and the unicharset from tessdata/eng.traineddata run:

           combine_tessdata -e tessdata/eng.traineddata \
             /home/$USER/temp/eng.config /home/$USER/temp/eng.unicharset

       The desired config file and unicharset will be written to
       /home/$USER/temp/eng.config /home/$USER/temp/eng.unicharset

       Specify option -o to overwrite individual components of the given
       [lang].traineddata file. For example, to overwrite language config and
       unichar ambiguities files in tessdata/eng.traineddata use:

           combine_tessdata -o tessdata/eng.traineddata \
             /home/$USER/temp/eng.config /home/$USER/temp/eng.unicharambigs

       As a result, tessdata/eng.traineddata will contain the new language
       config and unichar ambigs, plus all the original DAWGs, classifier
       templates, etc.

       Note: the file names of the files to extract to and to overwrite from
       should have the appropriate file suffixes (extensions) indicating their
       tessdata component type (.unicharset for the unicharset, .unicharambigs
       for unichar ambigs, etc). See k*FileSuffix variable in
       ccutil/tessdatamanager.h.

       Specify option -u to unpack all the components to the specified path:

           combine_tessdata -u tessdata/eng.traineddata /home/$USER/temp/eng.

       This will create /home/$USER/temp/eng.* files with individual tessdata
       components from tessdata/eng.traineddata.

OPTIONS
       -e .traineddata FILE...: Extracts the specified components from the
       .traineddata file

       -o .traineddata FILE...: Overwrites the specified components of the
       .traineddata file with those provided on the comand line.

       -u .traineddata PATHPREFIX Unpacks the .traineddata using the provided
       prefix.

CAVEATS
       Prefix refers to the full file prefix, including period (.)

COMPONENTS
       The components in a Tesseract lang.traineddata file as of Tesseract
       3.02 are briefly described below; For more information on many of these
       files, see
       http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3

       lang.config
           (Optional) Language-specific overrides to default config variables.

       lang.unicharset
           (Required) The list of symbols that Tesseract recognizes, with
           properties. See unicharset(5).

       lang.unicharambigs
           (Optional) This file contains information on pairs of recognized
           symbols which are often confused. For example, rn and m.

       lang.inttemp
           (Required) Character shape templates for each unichar. Produced by
           mftraining(1).

       lang.pffmtable
           (Required) The number of features expected for each unichar.
           Produced by mftraining(1) from .tr files.

       lang.normproto
           (Required) Character normalization prototypes generated by
           cntraining(1) from .tr files.

       lang.punc-dawg
           (Optional) A dawg made from punctuation patterns found around
           words. The "word" part is replaced by a single space.

       lang.word-dawg
           (Optional) A dawg made from dictionary words from the language.

       lang.number-dawg
           (Optional) A dawg made from tokens which originally contained
           digits. Each digit is replaced by a space character.

       lang.freq-dawg
           (Optional) A dawg made from the most frequent words which would
           have gone into word-dawg.

       lang.fixed-length-dawgs
           (Optional) Several dawgs of different fixed lengths -- useful for
           languages like Chinese.

       lang.cube-unicharset
           (Optional) A unicharset for cube, if cube was trained on a
           different set of symbols.

       lang.cube-word-dawg
           (Optional) A word dawg for cube's alternate unicharset. Not needed
           if Cube was trained with Tesseract's unicharset.

       lang.shapetable
           (Optional) When present, a shapetable is an extra layer between the
           character classifier and the word recognizer that allows the
           character classifier to return a collection of unichar ids and
           fonts instead of a single unichar-id and font.

       lang.bigram-dawg
           (Optional) A dawg of word bigrams where the words are separated by
           a space and each digit is replaced by a ?.

       lang.unambig-dawg
           (Optional) TODO: Describe.

       lang.params-training-model
           (Optional) TODO: Describe.

HISTORY
       combine_tessdata(1) first appeared in version 3.00 of Tesseract

SEE ALSO
       tesseract(1), wordlist2dawg(1), cntraining(1), mftraining(1),
       unicharset(5), unicharambigs(5)

COPYING
       Copyright (C) 2009, Google Inc. Licensed under the Apache License,
       Version 2.0

AUTHOR
       The Tesseract OCR engine was written by Ray Smith and his research
       groups at Hewlett Packard (1985-1995) and Google (2006-present).

                                  02/09/2012               COMBINE_TESSDATA(1)