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unicharambigs.5.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="generator" content="AsciiDoc 8.6.9" />
<title>UNICHARAMBIGS(5)</title>
<style type="text/css">
/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
/* Default font. */
body {
font-family: Georgia,serif;
}
/* Title font. */
h1, h2, h3, h4, h5, h6,
div.title, caption.title,
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font-family: Arial,Helvetica,sans-serif;
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color: blue;
text-decoration: underline;
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margin-left: 0;
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margin-bottom: 0.5em;
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font-family: "Courier New", Courier, monospace;
font-size: inherit;
color: navy;
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margin: 0;
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pre {
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margin-bottom: 1.5em;
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margin-bottom: 1.5em;
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div.admonitionblock {
margin-top: 2.0em;
margin-bottom: 2.0em;
margin-right: 10%;
color: #606060;
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div.content { /* Block element content. */
padding: 0;
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color: #527bbd;
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text-align: left;
margin-top: 1.0em;
margin-bottom: 0.5em;
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#footer-badges { display: none; }
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margin-bottom: 0.1em;
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span.purple { color: purple; }
span.red { color: red; }
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span.teal { color: teal; }
span.white { color: white; }
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div.unbreakable { page-break-inside: avoid; }
/*
* xhtml11 specific
*
* */
div.tableblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
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}
thead, p.table.header {
font-weight: bold;
color: #527bbd;
}
p.table {
margin-top: 0;
}
/* Because the table frame attribute is overriden by CSS in most browsers. */
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border-style: none;
}
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border-right-style: none;
}
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}
/*
* html5 specific
*
* */
table.tableblock {
margin-top: 1.0em;
margin-bottom: 1.5em;
}
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table.tableblock.frame-none {
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th.tableblock.valign-bottom, td.tableblock.valign-bottom {
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/*
* manpage specific
*
* */
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padding-bottom: 0.5em;
border-top: 2px solid silver;
border-bottom: 2px solid silver;
}
body.manpage h2 {
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}
body.manpage div.sectionbody {
margin-left: 3em;
}
@media print {
body.manpage div#toc { display: none; }
}
</style>
<script type="text/javascript">
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<body class="manpage">
<div id="header">
<h1>
UNICHARAMBIGS(5) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>unicharambigs -
Tesseract unicharset ambiguities
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The unicharambigs file (a component of traineddata, see combine_tessdata(1) )
is used by Tesseract to represent possible ambiguities between characters,
or groups of characters.</p></div>
<div class="paragraph"><p>The file contains a number of lines, laid out as follow:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>[num] <TAB> [char(s)] <TAB> [num] <TAB> [char(s)] <TAB> [num]</code></pre>
</div></div>
<div class="hdlist"><table>
<tr>
<td class="hdlist1">
Field one
<br />
</td>
<td class="hdlist2">
<p style="margin-top: 0;">
the number of characters contained in field two
</p>
</td>
</tr>
<tr>
<td class="hdlist1">
Field two
<br />
</td>
<td class="hdlist2">
<p style="margin-top: 0;">
the character sequence to be replaced
</p>
</td>
</tr>
<tr>
<td class="hdlist1">
Field three
<br />
</td>
<td class="hdlist2">
<p style="margin-top: 0;">
the number of characters contained in field four
</p>
</td>
</tr>
<tr>
<td class="hdlist1">
Field four
<br />
</td>
<td class="hdlist2">
<p style="margin-top: 0;">
the character sequence used to replace field two
</p>
</td>
</tr>
<tr>
<td class="hdlist1">
Field five
<br />
</td>
<td class="hdlist2">
<p style="margin-top: 0;">
contains either 1 or 0. 1 denotes a mandatory
replacement, 0 denotes an optional replacement.
</p>
</td>
</tr>
</table></div>
<div class="paragraph"><p>Characters appearing in fields two and four should appear in
unicharset. The numbers in fields one and three refer to the
number of unichars (not bytes).</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><code>2 ' ' 1 " 1
1 m 2 r n 0
3 i i i 1 m 0</code></pre>
</div></div>
<div class="paragraph"><p>In this example, all instances of the <em>2</em> character sequence <em>'</em>' will
<strong>always</strong> be replaced by the <em>1</em> character sequence <em>"</em>; a <em>1</em> character
sequence <em>m</em> <strong>may</strong> be replaced by the <em>2</em> character sequence <em>rn</em>, and
the <em>3</em> character sequence <strong>may</strong> be replaced by the <em>1</em> character
sequence <em>m</em>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_history">HISTORY</h2>
<div class="sectionbody">
<div class="paragraph"><p>The unicharambigs file first appeared in Tesseract 3.00; prior to that, a
similar format, called DangAmbigs (<em>dangerous ambiguities</em>) was used: the
format was almost identical, except only mandatory replacements could be
specified, and field 5 was absent.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_bugs">BUGS</h2>
<div class="sectionbody">
<div class="paragraph"><p>This is a documentation "bug": it’s not currently clear what should be done
in the case of ligatures (such as <em>fi</em>) which may also appear as regular
letters in the unicharset.</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>
</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 2015-05-13 19:59:45 CEST
</div>
</div>
</body>
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