This requires libarchive-dev.
Tesseract can now load traineddata files in any of the archive formats
which are supported by libarchive. Example of a zipped BagIt archive:
$ unzip -l /usr/local/share/tessdata/zip.traineddata
Archive: /usr/local/share/tessdata/zip.traineddata
Length Date Time Name
--------- ---------- ----- ----
55 2019-03-05 15:27 bagit.txt
0 2019-03-05 15:25 data/
1557 2019-03-05 15:28 manifest-sha256.txt
1082890 2019-03-05 15:25 data/eng.word-dawg
1487588 2019-03-05 15:25 data/eng.lstm
7477 2019-03-05 15:25 data/eng.unicharset
63346 2019-03-05 15:25 data/eng.shapetable
976552 2019-03-05 15:25 data/eng.inttemp
13408 2019-03-05 15:25 data/eng.normproto
4322 2019-03-05 15:25 data/eng.punc-dawg
4738 2019-03-05 15:25 data/eng.lstm-number-dawg
1410 2019-03-05 15:25 data/eng.freq-dawg
844 2019-03-05 15:25 data/eng.pffmtable
6360 2019-03-05 15:25 data/eng.lstm-unicharset
1012 2019-03-05 15:25 data/eng.lstm-recoder
1047 2019-03-05 15:25 data/eng.unicharambigs
4322 2019-03-05 15:25 data/eng.lstm-punc-dawg
16109842 2019-03-05 15:25 data/eng.bigram-dawg
80 2019-03-05 15:25 data/eng.version
6426 2019-03-05 15:25 data/eng.number-dawg
3694794 2019-03-05 15:25 data/eng.lstm-word-dawg
--------- -------
23468070 21 files
`combine_tessdata -d` and `combine_tessdata -u` also work.
The traineddata files in the new format can be generated with
standard tools like zip or tar.
More work is needed for other training tools and big endian support.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
tesstrain_utils.sh sets the shell flag -e, so it exits immediately
if a command exits with a non-zero status.
The following command returns a non-zero status as soon as counter is a
multiple of par_factor (par_factor=8, that means as soon as 8 fonts or
images are processed):
let rem=counter%par_factor
The new code fixes this undesired exit.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
pango_coverage_get and pango_coverage_unref should not be called
with coverage == nullptr.
pango_font_get_coverage should not be called with font == nullptr.
Otherwise Pango prints runtime error messages:
(process:12657): Pango-CRITICAL **: pango_coverage_get: assertion 'coverage != NULL' failed
(process:12657): Pango-CRITICAL **: pango_coverage_unref: assertion 'coverage != NULL' failed
(process:12657): Pango-CRITICAL **: pango_font_get_coverage: assertion 'font != NULL' failed
(process:12657): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Typically those errors occur if a required font is not installed,
so this can be a quite common error.
Fix also a potential resource leak in PangoFontInfo::CoversUTF8Text.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
gcc warning:
src/training/text2image.cpp:694:35: warning:
ISO C++ forbids converting a string constant to ‘char*’
[-Wwrite-strings]
putenv expects a string which can be modified.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
This is a lightweight, semi-Pythonic conversion of tesstrain.sh that currently
supports only LSTM and not the Tesseract 3 training mode.
I attempted to keep source changes minimal so it would be easy to compare
bash to Python in code review and confirm equivalence.
Python 3.6+ is required. Ubuntu 18.04 ships Python 3.6 and it is a mandatory
package (the package manager is also written in Python), so it is available
in the baseline Tesseract 4.0 system.
There are minor output and behavioral changes, and advantages. Python's loggingis used. Temporary files are only deleted on success, so they can be inspected
if training files. Console output is more terse and the log file is more
verbose. And there are progress bars! (The python3-tqdm package is required.)
Where tesstrain.sh would sometimes fail without explanation and return an error
code of 1, it is much easier to find the point of failure in this version.
That was also the main motivation for this work.
Argument checking is also more comprehensive.
shellcheck warning:
In /tesseract/src/training/tesstrain_utils.sh line 209:
TIMESTAMP=`date +%Y-%m-%d`
^-- SC2006: Use $(..) instead of legacy `..`.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
The commit 10f2c45c00 unified the usage of mktemp, but with a
incorrect bash syntax and unnecessary definition of LANG_CODE
and TIMESTAMP. This patch fixes the above problems.
This fixes two warnings from LGTM:
Parameter feature_defs hides a global variable with the same name.
Parameter Config hides a global variable with the same name.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
