scan

#!/bin/bash
cd tmp

function process {
    uk=$1
    for i in $(ls scan-$uk-*.pnm | sort -V); do
        if convert $i -format "%[fx:mean>0.9999?1:0]" info: | grep -q 0; then
            convert $i $i.tif && rm -f $i
        else
            echo "$i is blank, skipping it."
            rm -f $i
        fi
    done
    tiffcp $(ls -1 -h scan-$uk-*.tif| sort -V | xargs echo) all-$uk.tif && rm -f scan-$uk-*.tif
    tesseract -l deu all-$uk.tif - pdf \
    | gs -o /documents/$(date +"%Y-%m-%d-%H%M%S.pdf") -sDEVICE=pdfwrite -dDownsampleColorImages=true -dDownsampleGrayImages=true -dDownsampleMonoImages=true -dColorImageResolution=36 -dGrayImageResolution=36 -dMonoImageResolution=36 -dColorImageDownsampleThreshold=1.0 -dGrayImageDownsampleThreshold=1.0 -dMonoImageDownsampleThreshold=1.0 - \
    && rm all-$uk.tif
}

while true; do
    device=$(scanimage -L | grep scanner | sed "s/.*\`\(.*\)'.*/\1/g")
    if [[ $device != fujitsu* ]]; then
        sleep 2
        continue
    fi
    echo "using device: $device"
    break
done
while true; do
    uk=$(dd if=/dev/urandom bs=2 count=2048 2>/dev/null| openssl sha1 | cut -c 21-26)
    scanimage --dev "$device" --batch=scan-$uk-%d.pnm --source "ADF DUPLEX" --mode Color --resolution 300 --page-width 210 --page-height 297 -t 0 -l 0 -x 210 -y 297 --format=pnm --contrast 50 >/dev/null 2>&1
    if [[ $? != 0 ]]; then
        sleep 2
        continue
    fi
    date +"%Y-%m-%d NEW JOB $uk"
    process $uk &
done