# UNICHARSET_EXTRACTOR(1)

## NAME

unicharset_extractor - Reads box or plain text files to extract the unicharset.

## SYNOPSIS

unicharset_extractor [--output_unicharset filename] [--norm_mode mode] box_or_text_file […]

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)

## DESCRIPTION

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:

    unicharset_extractor fontfile_1.box fontfile_2.box ...

The unicharset will be put into the file ./unicharset if no output filename is provided.

NOTE Use the appropriate norm_mode based on the language.

## SEE ALSO

tesseract(1), unicharset(5)

https://tesseract-ocr.github.io/tessdoc/Training-Tesseract.html

## HISTORY

unicharset_extractor first appeared in Tesseract 2.00.

## COPYING

Copyright (C) 2006, Google Inc. Licensed under the Apache License, Version 2.0

## AUTHOR

The Tesseract OCR engine was written by Ray Smith and his research groups at Hewlett Packard (1985-1995) and Google (2006-2018).