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55 lines
1.9 KiB
Plaintext
55 lines
1.9 KiB
Plaintext
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UNICHARSET_EXTRACTOR(1)
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=======================
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NAME
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----
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unicharset_extractor - extract unicharset from Tesseract boxfiles
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SYNOPSIS
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--------
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*unicharset_extractor* 'FILE'...
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DESCRIPTION
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-----------
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Tesseract needs to know the set of possible characters it can output.
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To generate the unicharset data file, use the unicharset_extractor
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program on the same training pages bounding box files as used for
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clustering:
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unicharset_extractor fontfile_1.box fontfile_2.box ...
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Tesseract needs to have access to character properties isalpha,
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isdigit, isupper, islower, ispunctuation. This data must be encoded
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in the unicharset data file. Each line of this file corresponds to
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one character. The character in UTF-8 is followed by a hexadecimal
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number representing a binary mask that encodes the properties. Each
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bit corresponds to a property. If the bit is set to 1, it means that
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the property is true. The bit ordering is (from least significant bit
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to most significant bit): isalpha, islower, isupper, isdigit,
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ispunctuation.
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(See unicharset(5))
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If your system supports the wctype functions, these values will be set
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automatically by unicharset_extractor and there is no need to edit the
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unicharset file. On some older systems (eg Windows 95), the unicharset
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file must be edited by hand to add these property description codes.
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*NOTE* The unicharset file must be regenerated whenever inttemp, normproto
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and pffmtable are generated (i.e. they must all be recreated when the box
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file is changed) as they have to be in sync. This is made easier than in
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previous versions by running unicharset_extractor before mftraining and
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cntraining, and giving the unicharset to mftraining.
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SEE ALSO
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--------
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tesseract(1), unicharset(5)
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HISTORY
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-------
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unicharset_extractor first appeared in Tesseract 2.00.
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COPYING
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-------
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Copyright (C) 2006, Google Inc.
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Licensed under the Apache License, Version 2.0
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