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add docs for TESSDATA_PREFIX

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Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
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Michele Dolfi 2024-10-08 11:37:24 +02:00
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@ -85,23 +85,31 @@ Works on macOS, Linux and Windows environments. Both x86_64 and arm64 architectu
[Tesseract](https://github.com/tesseract-ocr/tesseract) is a popular OCR engine which is available [Tesseract](https://github.com/tesseract-ocr/tesseract) is a popular OCR engine which is available
on most operating systems. For using this engine with Docling, Tesseract must be installed on your on most operating systems. For using this engine with Docling, Tesseract must be installed on your
system, using the packaging tool of your choice. Below we provide example commands. system, using the packaging tool of your choice. Below we provide example commands.
After installing Tesseract you are expected to provide the path to its language files using the
`TESSDATA_PREFIX` environment variable (note that it must terminate with a slash `/`).
For macOS, we reccomend using [Homebrew](https://brew.sh/). For macOS, we reccomend using [Homebrew](https://brew.sh/).
```console ```console
brew install tesseract leptonica pkg-config brew install tesseract leptonica pkg-config
TESSDATA_PREFIX=/opt/homebrew/share/tessdata/
echo "Set TESSDATA_PREFIX=${TESSDATA_PREFIX}"
``` ```
For Debian-based systems. For Debian-based systems.
```console ```console
apt-get install tesseract-ocr tesseract-ocr-eng libtesseract-dev libleptonica-dev pkg-config apt-get install tesseract-ocr tesseract-ocr-eng libtesseract-dev libleptonica-dev pkg-config
TESSDATA_PREFIX=$(dpkg -L tesseract-ocr-eng | grep tessdata$)
echo "Set TESSDATA_PREFIX=${TESSDATA_PREFIX}"
``` ```
For RHEL systems. For RHEL systems.
```console ```console
dnf install tesseract tesseract-devel tesseract-langpack-eng leptonica-devel dnf install tesseract tesseract-devel tesseract-langpack-eng leptonica-devel
TESSDATA_PREFIX=/usr/share/tesseract/tessdata/
echo "Set TESSDATA_PREFIX=${TESSDATA_PREFIX}"
``` ```
#### Linking to Tesseract #### Linking to Tesseract