linux (centos7)上装Tesseract-OCR最新版本(5.0)

由于在服务器上安装tesseract yum只能拉到3.X版本而测试来看4.0以上版本识别效果比3.x要好很多。于是只能通过编译代码形式安装最新版了

首先在机器上找个目录打开官方git https://github.com/tesseract-ocr

打到4.1分支我们在服务器上找个目录 git clone https://github.com/tesseract-ocr/tesseract.git

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leptonica1.7（4.0要修必须在1.74以上）

wget http://www.leptonica.org/source/leptonica-1.74.4.tar.gz

tar -xzvf leptonica-1.74.4.tar.gz
cd leptonica-1.74.4
./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

回到tesseract目录，开始安装

./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 1.74 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.