could not find fonts

[Jingjing Lin]

When I was trying to fine tune a few character for chi_sim, by typing in:

src/training/tesstrain.sh --fonts_dir /usr/share/fonts --lang chi_sim --linedata_only \

  --noextract_font_properties --langdata_dir ../langdata \

  --tessdata_dir ./tessdata --output_dir ~/tesstutorial/train

I'm getting an error:

Could not find font named 'AR PL UKai CN'.

Pango suggested font 'Arial'.

I checked what fonts I have using:

text2image --find_fonts --text ./langdata/chi_sim/chi_sim.training_text --outputbase ./langdata/chi_sim/  --min_coverage 0.999  --fonts_dir=/usr/share/fonts/    

indeed didn't see AR PL UKai CN.   

Now my question is,

How do I install necessary fonts for chi_sim?

I couldn't find a way to do it from here:

https://github.com/tesseract-ocr/tesseract/wiki/Fonts

Thanks for your help!

[Jingjing Lin]

turns out this is actually not a tesseract problem, instead it's an operating system problem. we need to install the necessary fonts to our operating system (ubuntu) via:

sudo apt-get install ***

a useful link is:  

https://github.com/tesseract-ocr/tesseract/blob/master/src/training/language-specific.sh

here you find the fonts necessary for your language.

In the end I couldn't find some of the fonts listed in the link above for chi_sim, so I added some other fonts to training/language-specific.sh, and make sure these fonts can be find at langdata/font_properties

would appreciate it if anybody knows where to find the necessary chi_sim that was used for training. Although I believe some of them are commercial.

to find the fonts available in our system, you can use: fc-list :lang=** (for chinese **=zh)

在 2019年6月13日星期四 UTC-4上午10:38:39，Jingjing Lin写道：

[Shree Devi Kumar]

FYI

Font list used for LSTM training is at https://github.com/tesseract-ocr/langdata_lstm/blob/master/chi_sim/okfonts.txt

ttps://github.com/tesseract-ocr/tesseract/blob/master/src/training/language-specific.sh  lists the fonts used for base tesseract (version  3.0x) 

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[Jingjing Lin]

Thanks for the info.

在 2019年6月13日星期四 UTC-4下午12:39:57，shree写道：

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[Jingjing Lin]

Why hasn't the list below been updated though? For the chi_sim_fonts I only see the fonts used for base tesseract. Do we just need to manually add the fonts to language-specific.sh?

https://github.com/tesseract-ocr/tesseract/blob/master/src/training/language-specific.sh

在 2019年6月13日星期四 UTC-4下午12:39:57，shree写道：

FYI

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