原文地址：https://www.douyacun.com/article/0efecd58cd4cce699ce893ea9c79f21c

安装依赖

yum install autoconf automake libtool pkgconfig.x86_64 libpng12-devel.x86_64 libjpeg-devel libtiff-devel.x86_64 zlib-devel.x86_64 gcc gcc++

• Leptonica-1.79

wget http://www.leptonica.org/source/leptonica-1.79.0.tar.gz
tar -zxvf leptonica-1.79.0.tar.gz
cd leptonica-1.79.0
./configure --prefix=/usr/local/leptonica-1.79.0
make && make install

export PKG_CONFIG_PATH=/usr/local/leptonica-1.79.0/lib/pkgconfig

安装 tesseract 4.1.1 稳定版本

wget https://github.com/tesseract-ocr/tesseract/archive/refs/tags/4.1.1.zip

./autogen.sh
./configure --prefix=/usr/local/tesseract-4.1.1
make && make install

看下tesseract支持的语言

tesseract --list-lang

如果报错：

Error in pixReadMemJpeg: function not present
Error in pixReadMem: jpeg: no pix returned
Error during processing.

Error in pixReadMemTiff: function not present
Error in pixReadMem: tiff: no pix returned
Error in pixaGenerateFontFromString: pix not made
Error in bmfCreate: font pixa not made
Error opening data file /usr/local/share/tessdata/eng.traineddata

说明 jpeg 的依赖库没有安装， 执行:

yum install libpng12-devel.x86_64 libjpeg-devel libtiff-devel.x86_64 -y 

然后重新编译 Leptonica-1.79

安装训练文件：eng + chi_sim

wget https://github.com/tesseract-ocr/tessdata_best/blob/master/chi_sim.traineddata /usr/local/share/tessdata
wget https://github.com/tesseract-ocr/tessdata_best/blob/master/eng.traineddata /usr/local/share/tessdata

export TESSDATA_PREFIX=/usr/local/share/tessdata

安装Tesseract 5.0

git clone https://github.com/tesseract-ocr/tesseract.git
cd tesseract
./autogen.sh
./configure --prefix=/usr/local/tesseract-5.0 
make && make install

训练文件安装步骤 和 4.0 相同