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centos7.X 安装 tesseract-ocr

（1）依赖安装:
    yum install -y automake autoconf libtool gcc gcc-c++
    yum install autoconf automake libtool
    yum install libjpeg-devel libpng-devel libtiff-devel zlib-devel

（2）安装leptonica

    wget http://www.leptonica.org/source/leptonica-1.72.tar.gz
    tar xvzf leptonica-1.72.tar.gz
    cd leptonica-1.72/
    ./configure
    make && make install

（3）安装tesseract-ocr

    wget https://github.com/tesseract-ocr/tesseract/archive/3.04.zip
    unzip 3.04.zip
    cd tesseract-3.04/
    ./configure
    make && make install
    sudo ldconfig

 （4）在 /user/local/share/tessdata 下放置 chi_sim.traineddata

    下载地址: https://github.com/tesseract-ocr/tessdata