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123 lines
3.5 KiB
Plaintext
123 lines
3.5 KiB
Plaintext
TESSERACT(1)
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============
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NAME
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----
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tesseract - command-line OCR engine
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SYNOPSIS
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--------
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*tesseract* 'imagename' 'textbase' ['configfile'] ['-l lang']
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DESCRIPTION
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-----------
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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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by Google since then.
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OPTIONS
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-------
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'imagename'
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The name of the input image
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'textbase'
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The basename of the output file (to which the appropriate extension
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will be appended)
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'configfile'
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The config to use. A config is a plaintext file which contains a list
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of variables and their values, one per line, with a space separating
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variable from value.
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'-l lang'
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The language to use. If none is specified, English is assumed.
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Tesseract uses 3-character ISO 639-2 language codes. (See LANGUAGES)
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'-v'
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Returns the current version of the tesseract(1) executable.
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LANGUAGES
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---------
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There are currently language packs available for the following languages:
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[horizontal]
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bul:: Bulgarian
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cat:: Catalan
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ces:: Czech
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chi_sim:: Simplified Chinese
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chi_tra:: Traditional Chinese
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dan:: Danish
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dan-frak:: Danish (Fraktur)
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deu:: German
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ell:: Greek
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eng:: English
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fin:: Finnish
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fra:: French
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hun:: Hungarian
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ind:: Indonesian
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ita:: Italian
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jpn:: Japanese
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kor:: Korean
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lav:: Latvian
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lit:: Lithuanian
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nld:: Dutch
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nor:: Norwegian
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pol:: Polish
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por:: Portuguese
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ron:: Romanian
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rus:: Russian
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slk:: Slovakian
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slv:: Slovenian
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spa:: Spanish
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srp:: Serbian
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swe:: Swedish
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tgl:: Tagalog
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tha:: Thai
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tur:: Turkish
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ukr:: Ukrainian
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vie:: Vietnamese
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HISTORY
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-------
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The engine was developed at Hewlett Packard Laboratories Bristol and at
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Hewlett Packard Co, Greeley Colorado between 1985 and 1994, with some more
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changes made in 1996 to port to Windows, and some C\+\+izing in 1998. A
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lot of the code was written in C, and then some more was written in C\+\+.
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Since then all the code has been converted to at least compile with a
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C\++ compiler. Currently it builds under Linux with gcc4.0, gcc4.1 and
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under Windows with VC\+\+6 and VC\+\+Express. The C\++ code makes heavy use of
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a list system using macros. This predates stl, was portable before stl, and
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is more efficient than stl lists, but has the big negative that if you do get
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a segmentation violation, it is hard to debug. Another "feature" of the
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C/C\++ split is that the C\++ data structures get converted to C data
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structures to call the low-level C code. This is ugly, and the C++izing of
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the C code is a step towards eliminating the conversion, but it has not
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happened yet.
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The most important changes in version 2.00 were that Tesseract can now
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recognize 6 languages, is fully UTF8 capable, and is fully trainable. See
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<http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract> for more
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information on training.
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Tesseract was included in UNLV's Fourth Annual Test of OCR Accuracy.
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See <http://www.isri.unlv.edu/downloads/AT-1995.pdf>. With Tesseract 2.00,
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scripts are now included to allow anyone to reproduce some of these tests.
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See <http://code.google.com/p/tesseract-ocr/wiki/TestingTesseract> for more
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details.
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Tesseract 3.00 adds a number of new languages, including Chinese, Japanese,
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and Korean. It also introduces a new, single-file based system of managing
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language data. For further details, see the file ReleaseNotes included with
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the distribution.
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SEE ALSO
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--------
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tesseract(1)
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COPYING
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-------
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Licensed under the Apache License, Version 2.0
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