'\" t
.\"     Title: unicharset_extractor
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 03/26/2024
.\"    Manual: \ \&
.\"    Source: \ \&
.\"  Language: English
.\"
.TH "UNICHARSET_EXTRACTOR" "1" "03/26/2024" "\ \&" "\ \&"
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.SH "NAME"
unicharset_extractor \- Reads box or plain text files to extract the unicharset\&.
.SH "SYNOPSIS"
.sp
\fBunicharset_extractor\fR [\-\-output_unicharset filename] [\-\-norm_mode mode] box_or_text_file [\&...]
.sp
Where mode means: 1=combine graphemes (use for Latin and other simple scripts) 2=split graphemes (use for Indic/Khmer/Myanmar) 3=pure unicode (use for Arabic/Hebrew/Thai/Tibetan)
.SH "DESCRIPTION"
.sp
Tesseract needs to know the set of possible characters it can output\&. To generate the unicharset data file, use the unicharset_extractor program on training pages bounding box files or a plain text file:
.sp
.if n \{\
.RS 4
.\}
.nf
unicharset_extractor fontfile_1\&.box fontfile_2\&.box \&.\&.\&.
.fi
.if n \{\
.RE
.\}
.sp
The unicharset will be put into the file \fI\&./unicharset\fR if no output filename is provided\&.
.sp
\fBNOTE\fR Use the appropriate norm_mode based on the language\&.
.SH "SEE ALSO"
.sp
tesseract(1), unicharset(5)
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\m[blue]\fBhttps://tesseract\-ocr\&.github\&.io/tessdoc/Training\-Tesseract\&.html\fR\m[]
.SH "HISTORY"
.sp
unicharset_extractor first appeared in Tesseract 2\&.00\&.
.SH "COPYING"
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Copyright (C) 2006, Google Inc\&. Licensed under the Apache License, Version 2\&.0
.SH "AUTHOR"
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The Tesseract OCR engine was written by Ray Smith and his research groups at Hewlett Packard (1985\-1995) and Google (2006\-present)\&.