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Tesseract Training Data

Source: R/tessdata.R
tessdata.Rd

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.

Usage

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:

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.

References

tesseract wiki: training data

See also

Other tesseract: ocr(), tesseract()

Examples

if (FALSE) { # \dontrun{
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)
} # }