Linux（CentOS）下安装tesseract-ocr以及配置依赖leptonica

下载

wget https://github.com/tesseract-ocr/tesseract/archive/4.1.0.tar.gz
wget http://www.leptonica.org/source/leptonica-1.74.4.tar.gz

安装依赖：yum install autoconf automake libtool libjpeg-devel libpng-devel libtiff-devel zlib-devel

安装leptonica

tar -xzvf leptonica-1.74.4.tar.gz
cd leptonica-1.74.4.tar.gz
./configure --profix=/usr/local/leptonica
make
sudo make install

很多其他教程到这一步就直接开始安装 tesseract，实际上如果你照着教程走的话，再 configure 的时候就会报错：找不到 leptonica。所以我们要先配置一下 leptonica 的环境变量。

打开 /etc/profile

vim /etc/profile

添加以下字段

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/leptonica/lib/pkgconfig
export PKG_CONFIG_PATH
CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:/usr/local/leptonica/include/leptonica
export CPLUS_INCLUDE_PATH
C_INCLUDE_PATH=$C_INCLUDE_PATH:/usr/local/leptonica/include/leptonica
export C_INCLUDE_PATH
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/leptonica/lib
export LD_LIBRARY_PATH
LIBRARY_PATH=$LIBRARY_PATH:/usr/local/leptonica/lib
export LIBRARY_PATH
LIBLEPT_HEADERSDIR=/usr/local/leptonica/include/leptonica
export LIBLEPT_HEADERSDIR

应用配置

source /etc/profile

OK，现在我们就可以开始安装 tesseract。

安装 tesseract

tar -xzvf 4.1.0.tar.gz
cd tesseract-4.1.0
./configure --profix=/usr/local/tesseract
make
sudo make install

接下来配置 tesseract 环境变量

打开 /etc/profile

vim /etc/profile

追加以下字段

PATH=$PATH:/usr/local/tesseract/bin
export PATH

应用配置

source /etc/profile

测试一下：

tesseract -v

输出：

tesseract 4.1.0
 leptonica-1.74.4
  libjpeg 6b (libjpeg-turbo 1.2.90) : libpng 1.5.13 : libtiff 4.0.3 : zlib 1.2.7

 Found AVX2
 Found AVX
 Found SSE

OK，到这里，我们就安装成功了，你的安装成功了吗？有任何问题评论告诉我吧！