CentOS 7上装Tesseract-OCR最新版本(5.0)

通过编译代码形式在服务器上安装Tesseract-OCR最新版了

安装基本的CentOS依赖项

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

• 如果新机器就随手安装上工具包

yum  install gtk2-devel yasm glibc.i686 libstdc++.so.6 libgtk-x11-2.0.so libatk-1.0.so.0 libcairo.so.2  libcups.so.2 libgdk-x11-2.0.so.0  libgdk_pixbuf-2.0.so.0 libgtk-x11-2.0.so.0  libpango-1.0.so.0   libpangocairo-1.0.so.0  libICE.so.6 libSM.so.6 libmng.so.1  libpng12.so.0  libGLU.so.1 -y

• 安装开发工具

 　yum groupinstall "Development Tools"

安装leptonica1.82.0（latest）

wget http://www.leptonica.org/source/leptonica-1.82.0.tar.gz

　tar -xzvf leptonica-1.82.0.tar.gz
　cd leptonica-1.82.0
　./configure --prefix=/usr/local/
　make && make install

配置环境
vim \etc\bashrc
加入

　PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
　export PKG_CONFIG_PATH
　CPLUS_INCLUDE_PATH=$CPLUS_INCLUDE_PATH:/usr/local/include/
　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/lib
　export LD_LIBRARY_PATH
　LIBRARY_PATH=$LIBRARY_PATH:/usr/local/lib
　export LIBRARY_PATH
　TESSDATA_PREFIX=/root/tesseract/
　export TESSDATA_PREFIX
 
　最后刷新
　source /etc/bashrc

编译tesseract-5.0

　yum install git

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

回到tesseract目录，开始安装

cd tesseract
./autogen.sh

./configure --with-extra-includes=/usr/local/include --with-extra-libraries=/usr/local/include

注：这时有可能会报 configure: error: Leptonica 1.82 or higher is required. Try to install libleptonica-dev package.

明明我们已经安装了的。为什么还会报呢？

那就要加入环境变量

vim /etc/profile

　在最后插入

　export LD_LIBRARY_PATH=$LD_LIBRARY_PAYT:/usr/local/lib
　export LIBLEPT_HEADERSDIR=/usr/local/include
　export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

最后刷新下文件

source /etc/profile 

然后我们再执行

./autogen.sh
./configure --with-extra-includes=/usr/local/include --with-extra-libraries=/usr/local/include

这时就没有 leptonica问题啦，随后make下

make && sudo make install

 

最后我们用代码测试一切都正常，但到项目中却莫明奇妙地失败，断点服务直接崩掉，cache不住，找不到报错

各种百度google最后确认下来可能少了tess4j要的linux依赖库

执行下

cp /usr/local/lib/*.so.* /usr/lib64/

如果报

Error in findTiffCompression: function not present
Error in pixReadStreamTiff: function not present
Error in pixReadStream: tiff: no pix returned
Error in pixRead: pix not read
Unsupported image type.

相关。

那就是没有少了png和jpge依赖库

yum install libjpeg-devel
yum install libpng-devel

如果报

configure: error: Your compiler does not have the necessary C++17 support! Cannot proceed.

需要升级GCC版本，执行命令

yum install -y centos-release-scl
yum install devtoolset-8-gcc*

完成后切换当前会话中的gcc版本为8

scl enable devtoolset-8 bash

或者切换当前会话中的gcc版本为8

mv /usr/bin/gcc /usr/bin/gcc-4.8.5
ln -s /opt/rh/devtoolset-8/root/bin/gcc /usr/bin/gcc
mv /usr/bin/g++ /usr/bin/g++-4.8.5
ln -s /opt/rh/devtoolset-8/root/bin/g++ /usr/bin/g++

执行命令查看版本

gcc -v

进入leptonica的安装文件夹重新编译

./configure
make
make install

参考：

https://blog.csdn.net/weixin_41228101/article/details/109624733

https://www.cnblogs.com/panpan61803/p/10978117.html