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<body class="manpage">
<div id="header">
<h1>
UNICHARSET_EXTRACTOR(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>unicharset_extractor -
   extract unicharset from Tesseract boxfiles
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>unicharset_extractor</strong> <em>[-D dir]</em> <em>FILE</em>&#8230;</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>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:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>unicharset_extractor fontfile_1.box fontfile_2.box ...</code></pre>
</div></div>
<div class="paragraph"><p>The unicharset will be put into the file <em>dir/unicharset</em>, or simply
<em>./unicharset</em> if no output directory is provided.</p></div>
<div class="paragraph"><p>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))</p></div>
<div class="paragraph"><p>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.</p></div>
<div class="paragraph"><p><strong>NOTE</strong> 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.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p>tesseract(1), unicharset(5)</p></div>
<div class="paragraph"><p><a href="https://github.com/tesseract-ocr/tesseract/wiki/TrainingTesseract">https://github.com/tesseract-ocr/tesseract/wiki/TrainingTesseract</a></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_history">HISTORY</h2>
<div class="sectionbody">
<div class="paragraph"><p>unicharset_extractor first appeared in Tesseract 2.00.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_copying">COPYING</h2>
<div class="sectionbody">
<div class="paragraph"><p>Copyright (C) 2006, Google Inc.
Licensed under the Apache License, Version 2.0</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="paragraph"><p>The Tesseract OCR engine was written by Ray Smith and his research groups
at Hewlett Packard (1985-1995) and Google (2006-present).</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2015-06-12 23:52:38 CEST
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