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Code Issues Projects Releases Wiki Activity

Use language models from repository. Remove workaround for the legacy German Fraktur model.

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This commit is contained in:
Patrick Jentsch
2019-07-31 11:13:55 +02:00
parent 1a3d7175fe
commit fa4a798351
3 changed files with 12 additions and 49 deletions
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23
Dockerfile
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@@ -42,21 +42,18 @@ RUN echo "deb https://notesalexp.org/tesseract-ocr/stretch/ stretch main" >> /et
wget -O - https://notesalexp.org/debian/alexp_key.asc | apt-key add - && \
apt-get update && \
apt-get install -y --no-install-recommends \
tesseract-ocr && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/deu.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata/raw/master/deu_frak.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/eng.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/enm.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/fra.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/frm.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/ita.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/por.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/spa.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata
tesseract-ocr \
tesseract-ocr-deu \
tesseract-ocr-eng \
tesseract-ocr-enm \
tesseract-ocr-fra \
tesseract-ocr-frk \
tesseract-ocr-frm \
tesseract-ocr-ita \
tesseract-ocr-por \
tesseract-ocr-spa
COPY hocrtotei /usr/local/bin
COPY ocr /usr/local/bin
RUN mkdir /input /output && \
chmod a+rw /input /output
ENTRYPOINT ["ocr"]

30
README.md
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@@ -60,7 +60,7 @@ If you want to use the prebuilt image, replace `sfb1288inf/ocr:latest` with `git
`-l languagecode`
* Tells tesseract which language will be used.
* options = deu (German), deu_frak (German Fraktur), eng (English), enm (Middle englisch), fra (French), frm (Middle french), ita (Italian), por (Portuguese), spa (Spanish)
* options = deu (German), eng (English), enm (Middle englisch), fra (French), frk (German Fraktur), frm (Middle french), ita (Italian), por (Portuguese), spa (Spanish)
* required = True
`--keep-intermediates`
@@ -94,31 +94,3 @@ docker run \
--nCores 8 \
--skip-binarisation
```
# Additional language models for OCR
Additional language models can be easily installed. Just add them analogical to the existing models to the `Dockerfile`.
The standard language models for various languages can be found under https://github.com/tesseract-ocr/tessdata. Click on one of the languages and copy the link from the download button. The URL for Afrikaans (afr) would be for example https://github.com/tesseract-ocr/tessdata/raw/4.00/afr.traineddata.
The more accurate but slower language models can be found under https://github.com/tesseract-ocr/tessdata_best. Click on one of the languages and copy the link from the download button. The URL for Afrikaans (afr) would be for example https://github.com/tesseract-ocr/tessdata_best/raw/master/afr.traineddata.
Language models for fraktur fonts can also be found in the standard tessdata repository https://github.com/tesseract-ocr/tessdata.
The `Dockerfile` section for the language models with added language support for Afrikaans would look like this:
```
RUN echo "deb https://notesalexp.org/tesseract-ocr/stretch/ stretch main" >> /etc/apt/sources.list && \
wget -O - https://notesalexp.org/debian/alexp_key.asc | apt-key add - && \
apt-get update && \
apt-get install -y --no-install-recommends tesseract-ocr && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/afr.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/deu.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata/raw/master/deu_frak.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/eng.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/enm.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/fra.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/frm.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/ita.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/por.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata && \
wget -nv https://github.com/tesseract-ocr/tessdata_best/raw/master/spa.traineddata -P /usr/share/tesseract-ocr/4.00/tessdata
```

8
ocr
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@@ -30,7 +30,7 @@ def parse_arguments():
parser.add_argument(
'-l',
choices=[
'deu', 'deu_frak', 'eng', 'enm', 'fra', 'frm', 'ita', 'por', 'spa'
'deu', 'eng', 'enm', 'fra', 'frk', 'frm', 'ita', 'por', 'spa'
],
dest='lang',
required=True
@@ -240,12 +240,6 @@ class OCRWorkflow(WorkflowRunner):
' the available core number.
'''
ocr_job_n_cores = min(4, self.n_cores)
'''
' WORKAROUND: Tesseract only uses one core for the deu_frak language
' model, so the workflow will also only reserve one in this case.
'''
if self.lang == "deu_frak":
ocr_job_n_cores = 1
for index, job in enumerate(self.jobs):
files = os.listdir(os.path.join(job['output_dir'], 'tmp'))
if self.skip_binarisation: