djvu转换为pdf并ocr

中文识别需要安装
tesseract-ocr-chi-sim

语言参数设置为
chi_sim

```shell
#!/bin/bash
# Author: ICM Hoiwan

_install_deps() {
which ocrmypdf > /dev/null 2>&1

if [ $? -eq 1 ] ; then
    if [ -f /etc/os-release ] ; then
        source /etc/os-release
        if [ $ID == 'debian' ] ; then
            if [ $VERSION_ID -gt 12 ] ; then
                echo "Please input you password to install softwares."
                sleep 1
                sudo apt-get install -y ocrmypdf djvulibre-bin texlive-science tesseract-ocr \
                    tesseract-ocr-fra tesseract-ocr-eng tesseract-ocr-frk tesseract-ocr-grc 
            else
                echo "Please input you password to install softwares."
                sleep 1
                sudo apt-get install -y djvulibre-bin texlive-science tesseract-ocr \
                    tesseract-ocr-fra tesseract-ocr-eng tesseract-ocr-frk tesseract-ocr-grc
                pip3 install --upgrade pip3
                pip3 install ocrmypdf
            fi
        fi
    fi
else
    echo "All deps are installed!"
fi

}

if [ -z $1 ] ; then
cat > /dev/stdout <<EOF
USAGE: 
Default:
    Convert multiple language djvu file.
        $0 DJVUFILE

Specific language:    
    Convert English dvju file.
        $0 DJVUFILE eng
    
    Convert French djvu file.
        $0 DJVUFILE fra
    
    Convert German djvu file.
        $0 DJVUFILE frk
    
    Convert Greek djvu file.
        $0 DJVUFILE grc

EOF
    exit 1
fi

_install_deps

PSNAME=${1/djvu$/ps$}
if [[ $1 =~ "/" ]] ; then
        FULLNAME=$1
        DJVUNAME=${FULLNAME##*\/}
        DJVUPATH=${FULLNAME%\/*}
        PDFNAME=$DJVUPATH/${DJVUNAME/.djvu/.pdf}
        echo ${PDFNAME}
else
        FULLNAME=$1
        DJVUNAME=$1
        PDFNAME=${DJVUNAME/.djvu/.pdf}
        echo $PDFNAME
fi

LANG=${2:-eng+fra+grc+frk}

if [ -f $1 ] ; then
        if [ -f ${PDFNAME} ] ; then
                echo "PDF file already exists!"
                exit 1
        else
                djvups -verbose $FULLNAME - | ps2pdf - - | ocrmypdf -l ${LANG} --output-type pdf --jobs 32  --redo-ocr - ${PDFNAME} 
        fi
else
        echo "FILE Missing: ${1}. Wrong file name?"
fi

```

Keywords: ocrmypdf