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55 lines
2.7 KiB
XML
55 lines
2.7 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<?asciidoc-toc?>
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<?asciidoc-numbered?>
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<refentry lang="en">
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<refmeta>
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<refentrytitle>unicharset_extractor</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="source"> </refmiscinfo>
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<refmiscinfo class="manual"> </refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>unicharset_extractor</refname>
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<refpurpose>extract unicharset from Tesseract boxfiles</refpurpose>
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</refnamediv>
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<refsynopsisdiv id="_synopsis">
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<simpara><emphasis role="strong">unicharset_extractor</emphasis> <emphasis>FILE</emphasis>…</simpara>
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</refsynopsisdiv>
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<refsect1 id="_description">
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<title>DESCRIPTION</title>
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<simpara>Tesseract needs to know the set of possible characters it can output.
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To generate the unicharset data file, use the unicharset_extractor
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program on the same training pages bounding box files as used for
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clustering:</simpara>
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<literallayout class="monospaced">*unicharset_extractor* fontfile_1.box fontfile_2.box ...</literallayout>
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<simpara>Tesseract needs to have access to character properties isalpha,
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isdigit, isupper, islower, ispunctuation. This data must be encoded
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in the unicharset data file. Each line of this file corresponds to
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one character. The character in UTF-8 is followed by a hexadecimal
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number representing a binary mask that encodes the properties. Each
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bit corresponds to a property. If the bit is set to 1, it means that
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the property is true. The bit ordering is (from least significant bit
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to most significant bit): isalpha, islower, isupper, isdigit.
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(See unicharset(5))</simpara>
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<simpara>If your system supports the wctype functions, these values will be set
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automatically by unicharset_extractor and there is no need to edit the
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unicharset file. On some older systems (eg Windows 95), the unicharset
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file must be edited by hand to add these property description codes.</simpara>
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<simpara><emphasis role="strong">NOTE</emphasis> The unicharset file must be regenerated whenever inttemp, normproto
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and pffmtable are generated (i.e. they must all be recreated when the box
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file is changed) as they have to be in sync. This is made easier than in
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previous versions by running unicharset_extractor before mftraining and
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cntraining, and giving the unicharset to mftraining.</simpara>
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</refsect1>
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<refsect1 id="_see_also">
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<title>SEE ALSO</title>
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<simpara>tesseract(1), unicharset(5)</simpara>
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</refsect1>
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<refsect1 id="_copying">
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<title>COPYING</title>
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<simpara>Copyright (C) 2009, Google Inc.
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Licensed under the Apache License, Version 2.0</simpara>
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</refsect1>
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</refentry>
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