text2image Null box at index 0

[YiWenFY]

root@ubuntu:/home/administrator/tesseract-master# /usr/local/bin/text2image --text=/home/administrator/langdata/chi_sim/chi_sim.training_text --fontconfig_tmpdir=/tmp/font_tmp.HKWX4LOUh0 --fonts_dir=/usr/share/fonts --strip_unrenderable_words --leading=52 --char_spacing=0.0 --exposure=0 --outputbase=/tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0 --max_pages=0 --font=FreeSerif Bold Stripped 211 unrenderable words Rendered page 0 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 222 unrenderable words Rendered page 1 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 218 unrenderable words Rendered page 2 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 202 unrenderable words Rendered page 3 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 211 unrenderable words Rendered page 4 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 224 unrenderable words Rendered page 5 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 214 unrenderable words Rendered page 6 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 203 unrenderable words Rendered page 7 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 203 unrenderable words Rendered page 8 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 206 unrenderable words Rendered page 9 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 200 unrenderable words Rendered page 10 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 213 unrenderable words Rendered page 11 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 218 unrenderable words Rendered page 12 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 223 unrenderable words Rendered page 13 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 198 unrenderable words Rendered page 14 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 220 unrenderable words Rendered page 15 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 230 unrenderable words Rendered page 16 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 225 unrenderable words Rendered page 17 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 214 unrenderable words Rendered page 18 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 234 unrenderable words Rendered page 19 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 219 unrenderable words Rendered page 20 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 199 unrenderable words Rendered page 21 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 203 unrenderable words Rendered page 22 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 215 unrenderable words Rendered page 23 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 216 unrenderable words Rendered page 24 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 216 unrenderable words Rendered page 25 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 211 unrenderable words Rendered page 26 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 228 unrenderable words Rendered page 27 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 214 unrenderable words Rendered page 28 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 210 unrenderable words Rendered page 29 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 228 unrenderable words Rendered page 30 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 215 unrenderable words Rendered page 31 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 222 unrenderable words Rendered page 32 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 209 unrenderable words Rendered page 33 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 214 unrenderable words Rendered page 34 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 204 unrenderable words Rendered page 35 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 236 unrenderable words Rendered page 36 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 224 unrenderable words Rendered page 37 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 196 unrenderable words Rendered page 38 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 222 unrenderable words Rendered page 39 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 209 unrenderable words Rendered page 40 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 218 unrenderable words Rendered page 41 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 225 unrenderable words Rendered page 42 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 204 unrenderable words Rendered page 43 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 208 unrenderable words Rendered page 44 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 232 unrenderable words Rendered page 45 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 212 unrenderable words Rendered page 46 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 215 unrenderable words Rendered page 47 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 200 unrenderable words Rendered page 48 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 201 unrenderable words Rendered page 49 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 200 unrenderable words Rendered page 50 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 220 unrenderable words Rendered page 51 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 39 unrenderable words Rendered page 52 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Null box at index 0 Error: Call PrepareToWrite before WriteTesseractBoxFile!!

[YiWenFY]

What's the problem? What should I do?

[stweil]

I tested this on Debian and get lower counts for the unrenderable words, but not error.

What is the output from /usr/local/bin/text2image --version? Which version of Ubuntu do you use? And do you get the problem with the tesseract-ocr package from Ubuntu, too?

[YiWenFY]

@stweil text2mage -v
4.0.0-beta.3 It is ok for me to use eng. training_text, but this problem only occurs when I use chi_sim. training_text

[Shreeshrii]

1. Please use beta.4/latest code from Github.
2. What is the version of your Freeserif font?

Rendered page 0 to file /tmp/chi_sim-2018-09-10.Dpf/chi_sim.FreeSerif_Bold.exp0.tif Stripped 222 unrenderable words

That means the font does not have support for Simplified Chinese, probably only rendering the English letters - check the generated tif files.

Try with a different font that you know supports Chi_sim.

[YiWenFY]

@Shreeshrii I see, thank you, I can use English, should not support the font

[Shreeshrii]

I can replicate the issue:

ubuntu@tesseract-ocr:~/tesstutorial$    /usr/bin/time ~/tesseract/src/training/tesstrain.sh \
>   --fonts_dir ../.fonts \
>   --lang chi_sim \
>   --linedata_only \
>   --noextract_font_properties \
>   --langdata_dir ../langdata \
>   --tessdata_dir ../tessdata_best \
>   --fontlist "FreeSerif Bold" \
>   --training_text ../langdata/chi_sim/chi_sim.training_text \
>   --workspace_dir ~/tmp \
>   --output_dir ../tesstutorial/chi_sim_test

=== Starting training for language 'chi_sim'
[Tue Sep 11 05:54:59 UTC 2018] /home/ubuntu/tesseract/src/training/text2image --fonts_dir=../.fonts --font=FreeSerif Bold --outputbase=/home/ubuntu/tmp/fc-cache/sample_text.txt --text=/home/ubuntu/tmp/fc-cache/sample_text.txt --fontconfig_tmpdir=/home/ubuntu/tmp/fc-cache
Rendered page 0 to file /home/ubuntu/tmp/fc-cache/sample_text.txt.tif

=== Phase I: Generating training images ===
Rendering using FreeSerif Bold
[Tue Sep 11 05:55:07 UTC 2018] /home/ubuntu/tesseract/src/training/text2image --fontconfig_tmpdir=/home/ubuntu/tmp/fc-cache --fonts_dir=../.fonts --strip_unrenderable_words --leading=32 --char_spacing=0.0 --exposure=0 --outputbase=/tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0 --max_pages=0 --font=FreeSerif Bold --text=../langdata/chi_sim/chi_sim.training_text
Stripped 235 unrenderable words
Rendered page 0 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
Stripped 252 unrenderable words
Rendered page 1 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
Stripped 246 unrenderable words
Rendered page 2 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
Stripped 218 unrenderable words
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Stripped 238 unrenderable words
Rendered page 4 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
Stripped 247 unrenderable words
Rendered page 5 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
Stripped 224 unrenderable words
Rendered page 6 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
Stripped 231 unrenderable words
Rendered page 7 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
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Rendered page 34 to file /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.tif
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Null box at index 0
Error: Call PrepareToWrite before WriteTesseractBoxFile!!

=== Phase UP: Generating unicharset and unichar properties files ===
[Tue Sep 11 05:55:41 UTC 2018] /home/ubuntu/tesseract/src/training/unicharset_extractor --output_unicharset /tmp/chi_sim-2018-09-11.T5E/chi_sim.unicharset --norm_mode 1 /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.box
Failed to read data from: /tmp/chi_sim-2018-09-11.T5E/chi_sim.FreeSerif_Bold.exp0.box
Wrote unicharset file /tmp/chi_sim-2018-09-11.T5E/chi_sim.unicharset

[Shreeshrii]

chi_sim.FreeSerif_Bold.exp0.zip

Zip file with the generated tif file, has only English in it.

@stweil, I have seen this error in other cases also.

ubuntu@tesseract-ocr:~/tesstutorial$ which text2image /home/ubuntu/tesseract/src/training/text2image

ubuntu@tesseract-ocr:~/tesstutorial$ text2image -v 4.0.0-beta.4-138-g2093

[stweil]

Why was this closed? Shouldn't it get the bug label? In any case, I don't think that it must be addressed before releasing 4.0.0.

[anonynamja]

I have the same issue on tesseract 4.0.0-beta.4-163-ge124

Rendering using Rounded M+ 1p
[Tue Sep 25 00:05:56 WIB 2018] /usr/local/bin/text2image --fontconfig_tmpdir=/tmp/font_tmp.5zVUYVMoc5 --fonts_dir=/home/home/temp --strip_unrenderable_words --leading=32 --char_spacing=0.0 --exposure=0 --outputbase=/tmp/jpn-2018-09-25.P8e/jpn.Rounded_M+_1p.exp0 --max_pages=0 --font=Rounded M+ 1p --text=/home/home/langdata/jpn/jpn.training_text
Stripped 54 unrenderable words
Rendered page 0 to file /tmp/jpn-2018-09-25.P8e/jpn.Rounded_M+_1p.exp0.tif
Stripped 38 unrenderable words
Rendered page 1 to file /tmp/jpn-2018-09-25.P8e/jpn.Rounded_M+_1p.exp0.tif
Stripped 38 unrenderable words
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Rendered page 36 to file /tmp/jpn-2018-09-25.P8e/jpn.Rounded_M+_1p.exp0.tif
Stripped 1 unrenderable words
Rendered page 37 to file /tmp/jpn-2018-09-25.P8e/jpn.Rounded_M+_1p.exp0.tif
Null box at index 0
Error: Call PrepareToWrite before WriteTesseractBoxFile!!

zip file with tmp output. The .tif file has the correct japanese text, but the .box file is empty.

Any advice on how to troubleshoot the issue would be much appreciated!

[Shreeshrii]

The tif file has 38 pages - 0 to 37. Please take a look at your training text and see if there is anything different in it at the point the tif file stops.

[Shreeshrii]

Additionally, for LSTM training, use

--noextract_font_properties \

as part of tesstrain.sh command.

[anonynamja]

Thanks! I made a mistake above and cloned the wrong langdata repo. Switched to the LSTM one and LSTM training is now running correctly, at least afaict.

[Naojen]

I have this type of issue, but i dint get the error, the traindata was created and asked me to run lstm, the box file i got does not segment the character in the it has to be. shreeshri help me out

[Shreeshrii]

Related Issue https://github.com/tesseract-ocr/tesseract/issues/2654

[HeinrichWizardKreuser]

I found for all cases I worked, that if the number of spaces before the first non-whitespace character in the text file is more than 1 space, then this error occurs. Otherwise if the first non-whitespace character has 1 or less whitespace before it, the error does not occur for me.

[Ganesh9100]

The same it works for english but not for hindi

[DesBw]

This problem is bugging me both on the Mac and Ubuntu. I am pretty sure the problem is not with the text. It seems to have something with memory or something like that.

It has rhythm. It processes correctly for a couple of lines: then --null box error for two lines, then normal process for a couple of lines, then null box for two lines etc. I really don't know what to do.