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Fonts
Tesseract training can use images made from text which was rendered with a list of fonts. Those fonts must be available on the host where the training process is running.
The required fonts are defined in training/language-specific.sh.
To find fonts already installed on your system which will render a given training text, you can use the following command (change the language code and directory locations to match your setup). fontslist.txt will provide text that can be used in training/language-specific.sh.
text2image --find_fonts \
--fonts_dir /usr/share/fonts \
--text ../langdata/hin/hin.training_text \
--min_coverage .9 \
--outputbase ../langdata/hin/hin \
|& grep raw | sed -e 's/ :.*/" \\/g' | sed -e 's/^/ "/' >../langdata/hin/fontslist.txt
On Debian GNU Linux and similar distributions (Linux Mint, Ubuntu, ...), the required fonts can be installed like that:
# AMHARIC_FONTS (todo)
# ANCIENT_GREEK_FONTS (todo)
# ARABIC_FONTS (todo)
# ARMENIAN_FONTS (todo)
# BENGALI_FONTS (todo)
# BURMESE_FONTS (todo)
# CHI_SIM_FONTS (todo)
# CHI_TRA_FONTS (todo)
# DEVANAGARI_FONTS ( Also see external links below)
apt-get install fonts-deva
# EARLY_LATIN_FONTS (todo)
# FRAKTUR_FONTS (todo)
# GEORGIAN_FONTS (todo)
# GREEK_FONTS (todo)
# GUJARATI_FONTS (todo)
# HEBREW_FONTS (todo)
# JPN_FONTS (todo)
# KANNADA_FONTS (todo)
# KHMER_FONTS (todo)
# KOREAN_FONTS (todo)
# KURDISH_FONTS (todo)
# KYRGYZ_FONTS (todo)
# LAOTHIAN_FONTS (todo)
# LATIN_FONTS
apt-get install fonts-dejavu gsfonts ttf-mscorefonts-installer
# MALAYALAM_FONTS (todo)
# NEOLATIN_FONTS (still incomplete)
apt-get install fonts-ebgaramond fonts-gfs-didot fonts-gfs-didot-classic fonts-junicode
# NORTH_AMERICAN_ABORIGINAL_FONTS (todo)
# OLD_GEORGIAN_FONTS (todo)
# ORIYA_FONTS (todo)
# PERSIAN_FONTS (todo)
# PUNJABI_FONTS (todo)
# RUSSIAN_FONTS (todo)
# SINHALA_FONTS (todo)
# SYRIAC_FONTS (todo)
# TAMIL_FONTS (todo)
# TELUGU_FONTS (todo)
# THAANA_FONTS (todo)
# THAI_FONTS (todo)
# TIBETAN_FONTS (todo)
# VERTICAL_FONTS (todo)
# VIETNAMESE_FONTS (todo)
The installed fonts are shown by the command fc-list. See also the Debian wiki.
- https://fontlibrary.org/en (GFS Bodoni)
- https://fonts.google.com/
- http://iginomarini.com/fell/the-revival-fonts/
- http://scholarsfonts.net/ (Cardo)
- http://unifraktur.sourceforge.net/maguntia.html (UnifrakturMaguntia)
- http://www.ctan.org/tex-archive/fonts (GFS Bodoni)
- http://www.steffmann.de/wordpress/test-2/
- http://www.orbitals.com/self/ligature/ligature.htm (Wyld)
- https://en.wikipedia.org/wiki/Fraktur
- http://www.orbitals.com/self/ligature/ligature.htm 18th Century Ligatures and Fonts
- http://www.steffmann.de/wordpress/ (German)
Old wiki - no longer maintained. The pages were moved, see the new documentation.
These wiki pages are no longer maintained.
All pages were moved to tesseract-ocr/tessdoc.
The latest documentation is available at https://tesseract-ocr.github.io/.