tessdata function

Tesseract Training Data

Helper function to download training data from the official tessdata repository. On Linux, the fast training data can be installed directly with yum or apt-get.

tesseract_download(
  lang,
  datapath = NULL,
  model = c("fast", "best"),
  progress = interactive()
)

Arguments

• lang: three letter code for language, see tessdata repository.
• datapath: destination directory where to download store the file
• model: either fast or best is currently supported. The latter downloads more accurate (but slower) trained models for Tesseract 4.0 or higher
• progress: print progress while downloading

Details

Tesseract uses training data to perform OCR. Most systems default to English training data. To improve OCR performance for other languages you can to install the training data from your distribution. For example to install the spanish training data:

• tesseract-ocr-spa (Debian, Ubuntu)
• tesseract-langpack-spa (Fedora, EPEL)

On Windows and MacOS you can install languages using the tesseract_download function which downloads training data directly from github

and stores it in a the path on disk given by the TESSDATA_PREFIX variable.

Examples

## Not run:

if(is.na(match("fra", tesseract_info()$available)))
  tesseract_download("fra", model = 'best')
french <- tesseract("fra")
text <- ocr("https://jeroen.github.io/images/french_text.png", engine = french)
cat(text)
## End(Not run)

References

tesseract wiki: training data

See Also

Other tesseract: ocr(), tesseract()