mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-27 20:59:36 +08:00
58e06c8c45
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@670 d0cd1f9f-072b-0410-8dd7-cf729c803f20
793 lines
20 KiB
HTML
793 lines
20 KiB
HTML
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/*]]>*/
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</script>
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</head>
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<body>
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<div id="header">
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<h1>
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TESSERACT(1) Manual Page
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</h1>
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<h2>NAME</h2>
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<div class="sectionbody">
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<p>tesseract -
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command-line OCR engine
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</p>
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</div>
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</div>
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<div id="content">
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<h2 id="_synopsis">SYNOPSIS</h2>
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<div class="sectionbody">
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<div class="paragraph"><p><strong>tesseract</strong> <em>imagename</em> <em>outbase</em> [<em>-l lang</em>] [<em>-psm N</em>] [<em>configfile</em> …]</p></div>
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</div>
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<h2 id="_description">DESCRIPTION</h2>
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<div class="sectionbody">
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<div class="paragraph"><p>tesseract(1) is a commercial quality OCR engine originally developed at HP
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between 1985 and 1995. In 1995, this engine was among the top 3 evaluated by
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UNLV. It was open-sourced by HP and UNLV in 2005, and has been developed
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at Google since then.</p></div>
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</div>
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<h2 id="_options">OPTIONS</h2>
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<div class="sectionbody">
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<div class="dlist"><dl>
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<dt class="hdlist1">
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<em>imagename</em>
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</dt>
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<dd>
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<p>
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The name of the input image. Most image file formats (anything
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readable by Leptonica) are supported.
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</p>
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</dd>
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<dt class="hdlist1">
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<em>outbase</em>
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</dt>
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<dd>
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<p>
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The basename of the output file (to which the appropriate extension
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will be appended). By default the output will be named <em>outbase.txt</em>.
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</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>-l lang</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The language to use. If none is specified, English is assumed.
|
|
Multiple languages may be specified, separated by plus characters.
|
|
Tesseract uses 3-character ISO 639-2 language codes. (See LANGUAGES)
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>-psm N</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Set Tesseract to only run a subset of layout analysis and assume a certain form of image. The options for <strong>N</strong> are:
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><tt>0 = Orientation and script detection (OSD) only.
|
|
1 = Automatic page segmentation with OSD.
|
|
2 = Automatic page segmentation, but no OSD, or OCR.
|
|
3 = Fully automatic page segmentation, but no OSD. (Default)
|
|
4 = Assume a single column of text of variable sizes.
|
|
5 = Assume a single uniform block of vertically aligned text.
|
|
6 = Assume a single uniform block of text.
|
|
7 = Treat the image as a single text line.
|
|
8 = Treat the image as a single word.
|
|
9 = Treat the image as a single word in a circle.
|
|
10 = Treat the image as a single character.</tt></pre>
|
|
</div></div>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>-v</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Returns the current version of the tesseract(1) executable.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>configfile</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The name of a config to use. A config is a plaintext file which
|
|
contains a list of variables and their values, one per line, with a
|
|
space separating variable from value. Interesting config files
|
|
include:<br />
|
|
</p>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
hocr - Output in hOCR format instead of as a text file.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</dd>
|
|
</dl></div>
|
|
<div class="paragraph"><p><strong>Nota Bene:</strong> The options <em>-l lang</em> and <em>-psm N</em> must occur
|
|
before any <em>configfile</em>.</p></div>
|
|
</div>
|
|
<h2 id="_languages">LANGUAGES</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>There are currently language packs available for the following languages:</p></div>
|
|
<div class="paragraph"><p><strong>ara</strong> (Arabic),
|
|
<strong>aze</strong> (Azerbauijani),
|
|
<strong>bul</strong> (Bulgarian),
|
|
<strong>cat</strong> (Catalan),
|
|
<strong>ces</strong> (Czech),
|
|
<strong>chi_sim</strong> (Simplified Chinese),
|
|
<strong>chi_tra</strong> (Traditional Chinese),
|
|
<strong>chr</strong> (Cherokee),
|
|
<strong>dan</strong> (Danish),
|
|
<strong>dan-frak</strong> (Danish (Fraktur)),
|
|
<strong>deu</strong> (German),
|
|
<strong>ell</strong> (Greek),
|
|
<strong>eng</strong> (English),
|
|
<strong>enm</strong> (Old English),
|
|
<strong>epo</strong> (Esperanto),
|
|
<strong>est</strong> (Estonian),
|
|
<strong>fin</strong> (Finnish),
|
|
<strong>fra</strong> (French),
|
|
<strong>frm</strong> (Old French),
|
|
<strong>glg</strong> (Galician),
|
|
<strong>heb</strong> (Hebrew),
|
|
<strong>hin</strong> (Hindi),
|
|
<strong>hrv</strong> (Croation),
|
|
<strong>hun</strong> (Hungarian),
|
|
<strong>ind</strong> (Indonesian),
|
|
<strong>ita</strong> (Italian),
|
|
<strong>jpn</strong> (Japanese),
|
|
<strong>kor</strong> (Korean),
|
|
<strong>lav</strong> (Latvian),
|
|
<strong>lit</strong> (Lithuanian),
|
|
<strong>nld</strong> (Dutch),
|
|
<strong>nor</strong> (Norwegian),
|
|
<strong>pol</strong> (Polish),
|
|
<strong>por</strong> (Portuguese),
|
|
<strong>ron</strong> (Romanian),
|
|
<strong>rus</strong> (Russian),
|
|
<strong>slk</strong> (Slovakian),
|
|
<strong>slv</strong> (Slovenian),
|
|
<strong>sqi</strong> (Albanian),
|
|
<strong>spa</strong> (Spanish),
|
|
<strong>srp</strong> (Serbian),
|
|
<strong>swe</strong> (Swedish),
|
|
<strong>tam</strong> (Tamil),
|
|
<strong>tel</strong> (Telugu),
|
|
<strong>tgl</strong> (Tagalog),
|
|
<strong>tha</strong> (Thai),
|
|
<strong>tur</strong> (Turkish),
|
|
<strong>ukr</strong> (Ukrainian),
|
|
<strong>vie</strong> (Vietnamese)</p></div>
|
|
<div class="paragraph"><p>To use a non-standard language pack named <strong>foo.traineddata</strong>, set the
|
|
<strong>TESSDATA_PREFIX</strong> environment variable so the file can be found at
|
|
<strong>TESSDATA_PREFIX</strong>/tessdata/<strong>foo</strong>.traineddata and give Tesseract the
|
|
argument <em>-l foo</em>.</p></div>
|
|
</div>
|
|
<h2 id="_history">HISTORY</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The engine was developed at Hewlett Packard Laboratories Bristol and at
|
|
Hewlett Packard Co, Greeley Colorado between 1985 and 1994, with some more
|
|
changes made in 1996 to port to Windows, and some C++izing in 1998. A
|
|
lot of the code was written in C, and then some more was written in C++.
|
|
The C\++ code makes heavy use of a list system using macros. This predates
|
|
stl, was portable before stl, and is more efficient than stl lists, but has
|
|
the big negative that if you do get a segmentation violation, it is hard to
|
|
debug.</p></div>
|
|
<div class="paragraph"><p>Version 2.00 brought Unicode (UTF-8) support, six languages, and the ability
|
|
to train Tesseract.</p></div>
|
|
<div class="paragraph"><p>Tesseract was included in UNLV’s Fourth Annual Test of OCR Accuracy.
|
|
See <a href="http://www.isri.unlv.edu/downloads/AT-1995.pdf">http://www.isri.unlv.edu/downloads/AT-1995.pdf</a>. With Tesseract 2.00,
|
|
scripts are now included to allow anyone to reproduce some of these tests.
|
|
See <a href="http://code.google.com/p/tesseract-ocr/wiki/TestingTesseract">http://code.google.com/p/tesseract-ocr/wiki/TestingTesseract</a> for more
|
|
details.</p></div>
|
|
<div class="paragraph"><p>Tesseract 3.00 adds a number of new languages, including Chinese, Japanese,
|
|
and Korean. It also introduces a new, single-file based system of managing
|
|
language data.</p></div>
|
|
<div class="paragraph"><p>Tesseract 3.02 adds BiDirectional text support, the ability to recognize
|
|
multiple languages in a single image, and improved layout analysis.</p></div>
|
|
<div class="paragraph"><p>For further details, see the file ReleaseNotes included with the distribution.</p></div>
|
|
</div>
|
|
<h2 id="_resources">RESOURCES</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Main web site: <a href="http://code.google.com/p/tesseract-ocr/">http://code.google.com/p/tesseract-ocr/</a><br />
|
|
Information on training: <a href="http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3">http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3</a></p></div>
|
|
</div>
|
|
<h2 id="_see_also">SEE ALSO</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>ambiguous_words(1), cntraining(1), combine_tessdata(1), dawg2wordlist(1),
|
|
shape_training(1), mftraining(1), unicharambigs(5), unicharset(5),
|
|
unicharset_extractor(1), wordlist2dawg(1)</p></div>
|
|
</div>
|
|
<h2 id="_author">AUTHOR</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Tesseract development was led at Hewlett-Packard and Google by Ray Smith.
|
|
The development team has included:</p></div>
|
|
<div class="paragraph"><p>Ahmad Abdulkader, Chris Newton, Dan Johnson, Dar-Shyang Lee, David Eger,
|
|
Eric Wiseblatt, Faisal Shafait, Hiroshi Takenaka, Joe Liu, Joern Wanke,
|
|
Mark Seaman, Mickey Namiki, Nicholas Beato, Oded Fuhrmann, Phil Cheatle,
|
|
Pingping Xiu, Pong Eksombatchai (Chantat), Ranjith Unnikrishnan, Raquel
|
|
Romano, Ray Smith, Rika Antonova, Robert Moss, Samuel Charron, Sheelagh
|
|
Lloyd, Shobhit Saxena, and Thomas Kielbus.</p></div>
|
|
</div>
|
|
<h2 id="_copying">COPYING</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Licensed under the Apache License, Version 2.0</p></div>
|
|
</div>
|
|
</div>
|
|
<div id="footnotes"><hr /></div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2012-02-09 14:18:49 PDT
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|