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Tesseract

Install

1. Required package

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apt install autoconf-archive automake g++ libtool make pkg-config # for main recognization
apt install asciidoc # for document
apt-get install libicu-dev libpango1.0-dev libcairo2-dev # for training tool
1.1 Build libleptonica-dev from source
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sudo -i # build as root
wget http://www.leptonica.org/source/leptonica-1.76.0.tar.gz # check http://www.leptonica.org/download.html for latest version
tar -xzf leptonica-1.76.0.tar.gz
cd leptonica-1.76.0/
./configure
make
make install

2. Clone tesseract from github

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git clone https://github.com/tesseract-ocr/tesseract.git tesseract

3. Build as non-root user

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./autogen.sh
./configure --prefix=$HOME/tesseract/bin/
make
make install

4. Build training tool

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make training
make training-install

5. Get trained data

Download required language from https://github.com/tesseract-ocr/tesseract/wiki/Data-Files