mirror of
https://github.com/tesseract-ocr/tesseract.git
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0f9d507740
The last contribution from Google was in 2018
(see commit ce88adbf32).
Signed-off-by: Stefan Weil <sw@weilnetz.de>
202 lines
6.9 KiB
Plaintext
202 lines
6.9 KiB
Plaintext
COMBINE_TESSDATA(1)
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===================
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NAME
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----
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combine_tessdata - combine/extract/overwrite/list/compact Tesseract data
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SYNOPSIS
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--------
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*combine_tessdata* ['OPTION'] 'FILE'...
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DESCRIPTION
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-----------
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combine_tessdata(1) is the main program to combine/extract/overwrite/list/compact
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tessdata components in [lang].traineddata files.
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To combine all the individual tessdata components (unicharset, DAWGs,
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classifier templates, ambiguities, language configs) located at, say,
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/home/$USER/temp/eng.* run:
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combine_tessdata /home/$USER/temp/eng.
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The result will be a combined tessdata file /home/$USER/temp/eng.traineddata
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Specify option -e if you would like to extract individual components
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from a combined traineddata file. For example, to extract language config
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file and the unicharset from tessdata/eng.traineddata run:
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combine_tessdata -e tessdata/eng.traineddata \
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/home/$USER/temp/eng.config /home/$USER/temp/eng.unicharset
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The desired config file and unicharset will be written to
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/home/$USER/temp/eng.config /home/$USER/temp/eng.unicharset
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Specify option -o to overwrite individual components of the given
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[lang].traineddata file. For example, to overwrite language config
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and unichar ambiguities files in tessdata/eng.traineddata use:
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combine_tessdata -o tessdata/eng.traineddata \
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/home/$USER/temp/eng.config /home/$USER/temp/eng.unicharambigs
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As a result, tessdata/eng.traineddata will contain the new language config
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and unichar ambigs, plus all the original DAWGs, classifier templates, etc.
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Note: the file names of the files to extract to and to overwrite from should
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have the appropriate file suffixes (extensions) indicating their tessdata
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component type (.unicharset for the unicharset, .unicharambigs for unichar
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ambigs, etc). See k*FileSuffix variable in ccutil/tessdatamanager.h.
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Specify option -u to unpack all the components to the specified path:
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combine_tessdata -u tessdata/eng.traineddata /home/$USER/temp/eng.
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This will create /home/$USER/temp/eng.* files with individual tessdata
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components from tessdata/eng.traineddata.
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OPTIONS
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-------
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*-c* '.traineddata' 'FILE'...:
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Compacts the LSTM component in the .traineddata file to int.
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*-d* '.traineddata' 'FILE'...:
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Lists directory of components from the .traineddata file.
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*-e* '.traineddata' 'FILE'...:
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Extracts the specified components from the .traineddata file
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*-l* '.traineddata' 'FILE'...:
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List the network information.
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*-o* '.traineddata' 'FILE'...:
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Overwrites the specified components of the .traineddata file
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with those provided on the command line.
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*-u* '.traineddata' 'PATHPREFIX'
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Unpacks the .traineddata using the provided prefix.
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CAVEATS
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-------
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'Prefix' refers to the full file prefix, including period (.)
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COMPONENTS
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----------
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The components in a Tesseract lang.traineddata file as of
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Tesseract 4.0 are briefly described below; For more information on
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many of these files, see
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<https://tesseract-ocr.github.io/tessdoc/Training-Tesseract.html>
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and
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<https://tesseract-ocr.github.io/tessdoc/TrainingTesseract-4.00.html>
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lang.config::
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(Optional) Language-specific overrides to default config variables.
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For 4.0 traineddata files, lang.config provides control parameters which
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can affect layout analysis, and sub-languages.
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lang.unicharset::
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(Required - 3.0x legacy tesseract) The list of symbols that Tesseract recognizes, with properties.
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See unicharset(5).
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lang.unicharambigs::
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(Optional - 3.0x legacy tesseract) This file contains information on pairs of recognized symbols
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which are often confused. For example, 'rn' and 'm'.
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lang.inttemp::
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(Required - 3.0x legacy tesseract) Character shape templates for each unichar. Produced by
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mftraining(1).
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lang.pffmtable::
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(Required - 3.0x legacy tesseract) The number of features expected for each unichar.
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Produced by mftraining(1) from *.tr* files.
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lang.normproto::
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(Required - 3.0x legacy tesseract) Character normalization prototypes generated by cntraining(1)
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from *.tr* files.
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lang.punc-dawg::
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(Optional - 3.0x legacy tesseract) A dawg made from punctuation patterns found around words.
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The "word" part is replaced by a single space.
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lang.word-dawg::
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(Optional - 3.0x legacy tesseract) A dawg made from dictionary words from the language.
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lang.number-dawg::
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(Optional - 3.0x legacy tesseract) A dawg made from tokens which originally contained digits.
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Each digit is replaced by a space character.
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lang.freq-dawg::
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(Optional - 3.0x legacy tesseract) A dawg made from the most frequent words which would have
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gone into word-dawg.
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lang.fixed-length-dawgs::
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(Optional - 3.0x legacy tesseract) Several dawgs of different fixed lengths -- useful for
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languages like Chinese.
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lang.shapetable::
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(Optional - 3.0x legacy tesseract) When present, a shapetable is an extra layer between the character
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classifier and the word recognizer that allows the character classifier to
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return a collection of unichar ids and fonts instead of a single unichar-id
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and font.
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lang.bigram-dawg::
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(Optional - 3.0x legacy tesseract) A dawg of word bigrams where the words are separated by a space
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and each digit is replaced by a '?'.
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lang.unambig-dawg::
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(Optional - 3.0x legacy tesseract) .
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lang.params-model::
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(Optional - 3.0x legacy tesseract) .
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lang.lstm::
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(Required - 4.0 LSTM) Neural net trained recognition model generated by lstmtraining.
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lang.lstm-punc-dawg::
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(Optional - 4.0 LSTM) A dawg made from punctuation patterns found around words.
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The "word" part is replaced by a single space. Uses lang.lstm-unicharset.
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lang.lstm-word-dawg::
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(Optional - 4.0 LSTM) A dawg made from dictionary words from the language.
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Uses lang.lstm-unicharset.
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lang.lstm-number-dawg::
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(Optional - 4.0 LSTM) A dawg made from tokens which originally contained digits.
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Each digit is replaced by a space character. Uses lang.lstm-unicharset.
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lang.lstm-unicharset::
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(Required - 4.0 LSTM) The unicode character set that Tesseract recognizes, with properties.
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Same unicharset must be used to train the LSTM and build the lstm-*-dawgs files.
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lang.lstm-recoder::
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(Required - 4.0 LSTM) Unicharcompress, aka the recoder, which maps the unicharset
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further to the codes actually used by the neural network recognizer. This is created as
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part of the starter traineddata by combine_lang_model.
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lang.version::
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(Optional) Version string for the traineddata file.
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First appeared in version 4.0 of Tesseract.
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Old version of traineddata files will report Version:Pre-4.0.0.
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4.0 version of traineddata files may include the network spec
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used for LSTM training as part of version string.
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HISTORY
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-------
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combine_tessdata(1) first appeared in version 3.00 of Tesseract
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SEE ALSO
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--------
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tesseract(1), wordlist2dawg(1), cntraining(1), mftraining(1), unicharset(5),
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unicharambigs(5)
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COPYING
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-------
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Copyright \(C) 2009, Google Inc.
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Licensed under the Apache License, Version 2.0
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AUTHOR
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------
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The Tesseract OCR engine was written by Ray Smith and his research groups
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at Hewlett Packard (1985-1995) and Google (2006-2018).
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