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UNICHARSET_EXTRACTOR(1)                                UNICHARSET_EXTRACTOR(1)


NAME

       unicharset_extractor - extract unicharset from Tesseract boxfiles


SYNOPSIS

       unicharset_extractor [-D dir] FILE...


DESCRIPTION

       Tesseract needs to know the set of possible characters it can output.
       To generate the unicharset data file, use the unicharset_extractor
       program on the same training pages bounding box files as used for
       clustering:

           unicharset_extractor fontfile_1.box fontfile_2.box ...

       The unicharset will be put into the file dir/unicharset, or simply
       ./unicharset if no output directory is provided.

       Tesseract also needs to have access to character properties isalpha,
       isdigit, isupper, islower, ispunctuation. all of this auxilury data and
       more is encoded in this file. (See unicharset(5))

       If your system supports the wctype functions, these values will be set
       automatically by unicharset_extractor and there is no need to edit the
       unicharset file. On some older systems (eg Windows 95), the unicharset
       file must be edited by hand to add these property description codes.

       NOTE The unicharset file must be regenerated whenever inttemp,
       normproto and pffmtable are generated (i.e. they must all be recreated
       when the box file is changed) as they have to be in sync. This is made
       easier than in previous versions by running unicharset_extractor before
       mftraining and cntraining, and giving the unicharset to mftraining.


SEE ALSO

       tesseract(1), unicharset(5)

       http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3


HISTORY

       unicharset_extractor first appeared in Tesseract 2.00.


COPYING

       Copyright (C) 2006, 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           UNICHARSET_EXTRACTOR(1)

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