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124 lines
4.0 KiB
XML
124 lines
4.0 KiB
XML
<?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>unicharambigs</refentrytitle>
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<manvolnum>5</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>unicharambigs</refname>
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<refpurpose>Tesseract unicharset ambiguities</refpurpose>
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</refnamediv>
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<refsect1 id="_description">
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<title>DESCRIPTION</title>
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<simpara>The unicharambigs file (a component of traineddata, see combine_tessdata(1) )
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is used by Tesseract to represent possible ambiguities between characters,
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or groups of characters.</simpara>
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<simpara>The file contains a number of lines, laid out as follow:</simpara>
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<literallayout class="monospaced">[num] <TAB> [char(s)] <TAB> [num] <TAB> [char(s)] <TAB> [num]</literallayout>
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<informaltable tabstyle="horizontal" frame="none" colsep="0" rowsep="0"><tgroup cols="2"><colspec colwidth="15*"/><colspec colwidth="85*"/><tbody valign="top">
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<row>
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<entry>
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<simpara>
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Field one
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</simpara>
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</entry>
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<entry>
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<simpara>
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the number of characters contained in field two
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</simpara>
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</entry>
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</row>
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<row>
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<entry>
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<simpara>
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Field two
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</simpara>
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</entry>
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<entry>
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<simpara>
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the character sequence to be replaced
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</simpara>
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</entry>
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</row>
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<row>
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<entry>
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<simpara>
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Field three
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</simpara>
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</entry>
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<entry>
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<simpara>
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the number of characters contained in field four
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</simpara>
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</entry>
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</row>
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<row>
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<entry>
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<simpara>
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Field four
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</simpara>
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</entry>
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<entry>
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<simpara>
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the character sequence used to replace field two
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</simpara>
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</entry>
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</row>
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<row>
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<entry>
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<simpara>
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Field five
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</simpara>
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</entry>
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<entry>
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<simpara>
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contains either 1 or 0. 1 denotes a mandatory
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replacement, 0 denotes an optional replacement.
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</simpara>
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</entry>
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</row>
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</tbody></tgroup></informaltable>
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<simpara>Characters appearing in fields two and four should appear in
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unicharset. The numbers in fields one and three refer to the
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number of unichars (not bytes).</simpara>
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</refsect1>
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<refsect1 id="_example">
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<title>EXAMPLE</title>
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<literallayout class="monospaced">2 ' ' 1 " 1
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1 m 2 r n 0
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3 i i i 1 m 0</literallayout>
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<simpara>In this example, all instances of the <emphasis>2</emphasis> character sequence <emphasis>'</emphasis>' will
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<emphasis role="strong">always</emphasis> be replaced by the <emphasis>1</emphasis> character sequence <emphasis>"</emphasis>; a <emphasis>1</emphasis> character
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sequence <emphasis>m</emphasis> <emphasis role="strong">may</emphasis> be replaced by the <emphasis>2</emphasis> character sequence <emphasis>rn</emphasis>, and
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the <emphasis>3</emphasis> character sequence <emphasis role="strong">may</emphasis> be replaced by the <emphasis>1</emphasis> character
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sequence <emphasis>m</emphasis>.</simpara>
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</refsect1>
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<refsect1 id="_history">
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<title>HISTORY</title>
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<simpara>The unicharambigs file first appeared in Tesseract 3.00; prior to that, a
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similar format, called DangAmbigs (<emphasis>dangerous ambiguities</emphasis>) was used: the
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format was almost identical, except only mandatory replacements could be
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specified, and field 5 was absent.</simpara>
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</refsect1>
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<refsect1 id="_bugs">
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<title>BUGS</title>
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<simpara>This is a documentation "bug": it’s not currently clear what should be done
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in the case of ligatures (such as <emphasis>fi</emphasis>) which may also appear as regular
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letters in the unicharset.</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="_author">
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<title>AUTHOR</title>
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<simpara>The Tesseract OCR engine was written by Ray Smith and his research groups
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at Hewlett Packard (1985-1995) and Google (2006-present).</simpara>
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</refsect1>
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</refentry>
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