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<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">
<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><tt>[num] &lt;TAB&gt; [char(s)] &lt;TAB&gt; [num] &lt;TAB&gt; [char(s)] &lt;TAB&gt; [num]</tt></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>
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre><tt>2       ' '     1       "     1
1       m       2       r n   0
3       i i i   1       m     0</tt></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>
<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>
<h2 id="_bugs">BUGS</h2>
<div class="sectionbody">
<div class="paragraph"><p>This is a documentation "bug": it&#8217;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>
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p>tesseract(1), unicharset(5)</p></div>
</div>
<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 id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2012-02-08 10:59:49 PDT
</div>
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