#(Estimated Time of Completion: 45 minutes)
# Instructions taken (and slightly modified) from https://github.com/EisenVault/install-tesseract-redhat-centos/blob/master/install-tesseract.sh
# Install Leptonica from Source
# Sanity checks
# check if libpng is installed: type "whereis libpng" and expect to see a directory; a blank line is not good
# check if leptonica is installed: type "ls /usr/local/include" and expect to see "leptonica"
# Install Tesseract from Source
# Download and install tesseract language files (Tesseract 4 traineddata files)
# Sanity check
# check if tesseract is installed: type "tesseract --version" and expect to see 1st line (tesseract), 2nd line (leptonica), 3rd line(libraries for images)
# Instructions taken (and slightly modified) from https://github.com/EisenVault/install-tesseract-redhat-centos/blob/master/install-tesseract.sh
cd /opt# The following line will take 30 minutes to install.
yum -y update
yum -y install libstdc++ autoconf automake libtool autoconf-archive pkg-config gcc gcc-c++ make libjpeg-devel libpng-devel libtiff-devel zlib-devel
yum group install -y "Development Tools"
# Install Leptonica from Source
wget http://www.leptonica.org/source/leptonica-1.75.3.tar.gz
tar -zxvf leptonica-1.75.3.tar.gz
cd leptonica-1.75.3
./autobuild
./configure
make -j
make install
cd ..
# Delete tar.gz file if you like
# Sanity checks
# check if libpng is installed: type "whereis libpng" and expect to see a directory; a blank line is not good
# check if leptonica is installed: type "ls /usr/local/include" and expect to see "leptonica"
# Install Tesseract from Source
wget https://github.com/tesseract-ocr/tesseract/archive/4.0.0-beta.1.tar.gz
tar -zxvf 4.0.0-beta.1.tar.gz
cd tesseract-4.0.0-beta.1/
./autogen.sh
PKG_CONFIG_PATH=/usr/local/lib/pkgconfig LIBLEPT_HEADERSDIR=/usr/local/include ./configure --with-extra-includes=/usr/local/include --with-extra-libraries=/usr/local/lib
LDFLAGS="-L/usr/local/lib" CFLAGS="-I/usr/local/include" make -j
make install
ldconfig
cd ..
# Delete tar.gz file if you like
# Download and install tesseract language files (Tesseract 4 traineddata files)
wget https://github.com/tesseract-ocr/tessdata/raw/master/osd.traineddata
wget https://github.com/tesseract-ocr/tessdata/raw/master/equ.traineddata
wget https://github.com/tesseract-ocr/tessdata/raw/master/eng.traineddata
wget https://github.com/tesseract-ocr/tessdata/raw/master/chi_sim.traineddata
# download another other languages you likemv *.traineddata /usr/local/share/tessdata
# Sanity check
# check if tesseract is installed: type "tesseract --version" and expect to see 1st line (tesseract), 2nd line (leptonica), 3rd line(libraries for images)