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scan.sh
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scan.sh
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#!/bin/bash
#
# run this script like this to test for correct file permissions:
# sudo -u saned /etc/scanbuttond/scan.sh
#
# TODO:
# - on reset/restart, remove queue
# - unlock scan button earlier
# - analysis: somehow eliminate empty space, match against (known) words?
# add a way to reset on scanner jamming:
# killall scanimage; kill $(ps ax | grep 'scanbuttond/.*\.sh' | grep -v ' grep' | awk '{print $1}'); rm -f "$(ls -1dt /home/scans/scans/work/scan_* | head -n1)"/*.tif; touch "$(ls -1dt /home/scans/scans/work/scan_* | head -n1)"/done
# set up some paths
SCRIPT_PATH="$(readlink -f "$0")"
SCRIPT_DIR="$(dirname "$SCRIPT_PATH")"
CFGFN="scan.conf"
CFGPATH="$SCRIPT_DIR/$CFGFN"
SCAN_DEVICE="$1" # first argument can be a scan device or a command
CMD="$(echo "$1" | tr '[:upper:]' '[:lower:]')"
SCAN_PREFIX="scan"
# command to replace illegal file name chars (Windows) by underscore (renameByContent())
SANITIZE='tr "/\\\\?<>:*|&" _'
PYTHON="python3"
delIntermediate()
{
return 0; # debug is on
return 1; # debug is off
}
logSubDir()
{
local prefix="$1"
local ts="$2"
echo "$LOG_DIR/$ts $prefix"
}
timestamp()
{
local prefix="$1"
local ts; ts="$(date '+%Y-%m-%d_%H-%M-%S')"
# prevent identical time stamps by succeeding calls
local tsPrev; tsPrev="$(cat "$TIMESTAMPFN")"
if [ ! -z "$tsPrev" ] && [ "$tsPrev" = "$ts" ]; then
while [ "$tsPrev" = "$ts" ]; do
# add milliseconds if timestamp exists already
local ns; ns="$(date +%N)"
ts="${ts}-${ns:0:3}"
done
else
echo "$ts" > "$TIMESTAMPFN"
fi
local subdir; subdir="$(logSubDir "$prefix" "$ts")"
mkdir -p "$subdir"
local logFile="$subdir/${prefix}.log"
# echo "$prefix $ts"
echo "$prefix $ts > '$logFile' 2>&1"
}
imageWithCaption()
{
local vspace="$1"
echo "\thispagestyle{empty} \begin{center} \vspace*{${vspace}mm}
\includegraphics[width=0.3\textwidth]{qrcode.png} \\\\
{\huge $qrdesc \\ ($qrcmd, ${RESOLUTION}dpi, farbe)} \end{center}"
}
createCommand() {
echo " ############# createCommand $1 #############"
local prefix="$1"
local qrcmd="$2"
local qrdesc="$3"
local qrdir=$(mktemp -d)
echo "Using working dir: '$qrdir'"
cd "$qrdir" || return
qrencode -s 5 -d 300 -l H -o qrcode.png "$qrcmd"
# latex document
cat > "qrcode.tex" << EOF
%-*- coding: utf-8; -*-
\documentclass[a4paper]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage[german]{babel}
\usepackage{graphicx}
\usepackage{geometry}
\geometry{a4paper, bindingoffset=0mm, left=20mm,right=20mm, top=20mm, bottom=20mm}
\begin{document}
$(imageWithCaption 10)
$(imageWithCaption 90)
\newpage
$(imageWithCaption 10)
$(imageWithCaption 90)
\end{document}
EOF
pdflatex qrcode
local qrpdf="$qrdir/qrcode.pdf" # expected result pdf file
if [ ! -f "$qrpdf" ]; then
echo "No PDF was created: '$qrpdf'!"
return 1
fi;
dstdir="$OUT_DIR/$prefix"
mkdir -p "$dstdir"
mv "$qrpdf" "$dstdir/$qrcmd.pdf"
echo "created qr command sheet: $qrcmd"
delIntermediate || rm -Rf "$qrdir"
}
createCommandSheets()
{
echo "createCommandSheets $*"
local prefix="$1"
createCommand "$prefix" multi \
"Alle folgenden Blätter werden zu einem Dokument zusammengefasst.";
createCommand "$prefix" single \
"Jedes folgende Blatt wird ein einzelnes Dokument.";
}
# decide if a scanned page is blank (it won't be entirely @255)
# check for a command sheet with QR code on it and interpret it
classifyImg()
{
echo "classifyImg $*"
local infn="$1"
[ -f "$infn" ] || return
local testRatio=0.14 # percentage of nominal pixel count of an A4 page to keep
# get pixel count in given image
local pixcount; pixcount="$(convert "$infn" -format "%[fx:w*h]" info:)"
pixcount="$($PYTHON -c "print(int($pixcount))")"
# calculate target pixel count, approx. 1.2M for 300dpi
local pixcountMax=1200000 # always same number, calculus below for reference
[ -z "$pixcountMax" ] && pixcountMax="$($PYTHON -c "print(int(
($RESOLUTION*210./25.4) * ($RESOLUTION*297./25.4) * $testRatio))")"
local resizecmd=""
if [ ! -z "$pixcount" ] && [ ! -z "$pixcountMax" ] \
&& [ "$pixcount" -gt "$pixcountMax" ]; then
resizecmd="-resize $pixcountMax@"
fi
local cropfn; cropfn=$(mktemp --tmpdir="$(pwd)" "crop_XXXXXXXX.tif")
chmod a+rx "$cropfn"
# https://www.imagemagick.org/Usage/crop/#trim_blur
# https://superuser.com/a/1257643
# resize only first, need this for QR interpretation later
convert "$infn" $resizecmd -shave 8%x5% -colorspace gray "$cropfn"
# get remaining pixel count and crop position (ROI)
local pixcount geom
read pixcount geom < <(convert "$cropfn" \
-virtual-pixel White -blur 0x10 -fuzz 15% -trim \
-format "%[fx:w*h] %[fx:w]x%[fx:h]+%[fx:page.x]+%[fx:page.y]" info: 2>/dev/null)
pixcount="$($PYTHON -c "print(int($pixcount))")"
printf "#pix %d, geom: %s -> " "$pixcount" "$geom"
local move="mv"
if [ ! -z "$pixcount" ] && [ "$pixcount" -lt 100 ]; then
# with less than 100 pix left, it's blank
printf "blank\n"
$move "$infn" "$infn.blank"
else
mogrify -crop "$geom" "$cropfn"
printf "command code? "
mode="$(zbarimg -q --raw "$cropfn")"
if [ "$mode" == "multi" ]; then
printf "multi!\n"
$move "$infn" "$infn.multi"
elif [ "$mode" == "single" ]; then
printf "single!\n"
$move "$infn" "$infn.single"
else
printf "nope\n"
fi;
fi;
rm -f "$cropfn" # disable this for debugging
}
getTmpDir()
{
local prefix="$1"
local tmpdir; tmpdir="$(mktemp -d --tmpdir="$WORK_DIR" "${prefix}_XXXXXXXX")"
chmod -fR a+rx "$tmpdir"
echo "$tmpdir"
}
queueHead()
{
local pid; pid="$(head -n 1 "$QUEUEFN" | awk '{print $1}')"
[ -z "$pid" ] && pid=0
echo "$pid"
}
# extract text from pdf including bounding boxes for additional processing (TODO)
renameByContent()
{
local outfn="$1"
local textfn="$2"
local pydateconv=$(cat << EOF
import sys, datetime;
def convInt(x, width = 2):
try:
x = abs(int(x))
if width == 4 and x < 100:
cur = datetime.datetime.now().year % 100
if x <= cur:
x += 2000
else:
x += 1900
x = str("{0:0" + str(width) + "d}").format(x)
except:
pass
return x
y, m, d = sys.argv[1:]
print(convInt(y, 4) + "-" + convInt(m) + "-" + convInt(d))
EOF
)
# pdftotext -bbox "$outfn" "$textfn"
pdftotext -layout "$outfn" "$textfn"
# get the first word in plain text, replace illegal chars
#word="$(egrep '^\s+<word' "$textfn" | \
# awk -F'>' '{print $2}' | \
# awk -F'<' '{print $1}' | \
# head -n 1 | $SANITIZE )"
local word; word="$(head -n 1 "$textfn" | \
sed -e 's/^\s*//' -e 's/\s*$//' | $SANITIZE)"
if [ ! -z "$word" ]; then
# use the first 3 words and limit to 20 chars
word="$(echo "$word" | grep -Eo '^(\<\w+\>\s*)?(\<\w+\>\s*)?(\<\w+\>\s*)?')"
word="${word:0:20}"
echo "extracted text: '$word'"
# TODO:
# - multiple date formats: dd.mm.yyyy (currently)
# but also: dd-mm-yyyy, yyyy-mm-dd, dd/mm/yyyy
# - cut name length on word boundaries, trim whitespace after trimming!
# - detect invoice number?
local docdate
#docdate="$(egrep -o '[0-9]?[0-9]\.[0-9]?[0-9]\.[0-9]?[0-9]?[0-9][0-9]' $textfn | head -n 1)"
local regex='[^0-9]([0-9]?[0-9])[-/\. ]([0-9]?[0-9])[-/\. ]([0-9]?[0-9]?[0-9][0-9])'
[[ "$(cat "$textfn")" =~ $regex ]]
[ -z "$BASH_REMATCH" ] || docdate="$($PYTHON -c "$pydateconv" \
"${BASH_REMATCH[3]}" "${BASH_REMATCH[2]}" "${BASH_REMATCH[1]}")"
# prepending date in iso format, if any
[ -z "$docdate" ] || word="$docdate $word"
# trim leading&trailing whitespace
word="$(echo -e "${word}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
[ -z "$word" ] && return # nothing to rename to
# save with new file name if it doesn't exist already
local newfn; newfn="$(dirname "$outfn")/$word.pdf"
[ -e "$newfn" ] && newfn="${outfn%*.pdf} $word.pdf"
# move result PDF to final destination
# include first word from doc in name, limit its length
mv "$outfn" "$newfn"
fi;
}
queryJobCount()
{
jobs > "$TRJOBSFN"
}
getJobCount()
{
wc -l "$TRJOBSFN" | cut -d' ' -f1
}
st2pdf()
{
local outfile; outfile="$1"
shift # do not loop over output file below
local cpu_count; cpu_count=$(grep -c processor < /proc/cpuinfo)
TRJOBSFN="$(mktemp)"
for fn in "$@"; do
[ -f "$fn" ] || continue
echo "Processing '$fn' ..."
#sleep 1 &
tesseract -l $DOC_LANG "$fn" "$fn" pdf &
# job management
queryJobCount
while [ "$(getJobCount)" -ge "$cpu_count" ]; do
sleep 1; queryJobCount
done
done
wait # wait for all jobs to finish
rm -f "$TRJOBSFN"
#-dPDFSETTINGS=/screen (screen-view-only quality, 72 dpi images)
#-dPDFSETTINGS=/ebook (low quality, 150 dpi images)
#-dPDFSETTINGS=/printer (high quality, 300 dpi images)
#-dPDFSETTINGS=/prepress (high quality, color preserving, 300 dpi imgs)
#-dPDFSETTINGS=/default (almost identical to /screen)
eval gs -dPDFSETTINGS=/default \
-sColorImageDownsampleType=Bicubic \
-sGrayImageDownsampleType=Bicubic \
-sMonoImageDownsampleType=Bicubic \
-dColorImageDepth=2 \
-dGrayImageDepth=2 \
-dMonoImageDepth=2 \
-sEncodeColorImages=true \
-sEncodeGrayImages=true \
-sEncodeMonoImages=true \
-sColorImageFilter=DCTEncode \
-sGrayImageFilter=DCTEncode \
-sMonoImageFilter=CCITTFaxEncode \
-dCompatibilityLevel=1.7 -dNOPAUSE -dBATCH -sDEVICE=pdfwrite \
-o "$outfile" \
$(for fn in "$@"; do printf "'%s.pdf' " "$fn"; done)
for fn in "$@"; do rm -f "$fn.pdf"; done
}
# processes each document dir containing images and creates a ocr'd PDF file
processDoc()
{
local docdir="$1"
local prefix="$2"
local ts="$3"
[ -z "$docdir" ] && return # ignore missing doc dir, happens on startup
echo "processDoc $*"
renice 5 -u "$(whoami)" # lower process priority, this may take a while
# check if given document exists
if [ ! -d "$docdir" ]; then
echo "processDoc: Given document dir '$docdir' does not exist!"
return;
fi;
cd "$docdir" || return
local scans="${SCAN_PREFIX}_*.tif"
local fileCount; fileCount="$(ls -1 $scans 2> /dev/null | wc -l)"
if [ -z "$fileCount" ] || [ "$fileCount" -lt 1 ]; then
echo "processDoc: No scans found in '$docdir', skipping!"
return;
fi;
# add us to the queue and wait
echo "$BASHPID $*" >> "$QUEUEFN"
# stop this process if another is currently active
[ "$(queueHead)" -ne "$BASHPID" ] && kill -STOP "$BASHPID"
# remember timestamp once we continue processing here
local starttime; starttime="$(date +%s)"
echo "
############## Converting to PDF ##############
"
mkdir -p out_st
local textArgs="--normalize-illumination --skew-deviation=10.0"
# textArgs="--rotate=0.0"
scantailor-cli \
--dpi=$RESOLUTION --output-dpi=$RESOLUTION \
--layout=1 \
--disable-content-detection --enable-auto-margins \
--enable-page-detection \
--white-margins \
$textArgs \
--color-mode=color_grayscale \
--tiff-force-keep-color-space \
$scans out_st
# Use tiffcp to combine output tiffs to a single mult-page tiff
tiffcp out_st/$scans combined.tif
# Convert the tiff to PDF
tiff2pdf -j -q 90 combined.tif > combined.pdf
# fix pink color bug when using jpeg compression
sed -i'' -e 's/\/DecodeParms << \/ColorTransform 0 >>//g' combined.pdf
# move result (PDF containing images only) to output dir
local subdir; subdir="$(logSubDir "$prefix" "$ts")"
mv combined.pdf "$subdir/img.pdf"
echo "
################ OCR ################
"
local outfn="$OUT_DIR/$ts.pdf"
st2pdf "$outfn" $(ls out_st/$scans)
renameByContent "$outfn" "$subdir/text.txt"
echo "
################ Cleaning Up ################
"
cd ..
delIntermediate || rm -Rf "$docdir"
local elapsed; elapsed=$(($(date +%s)-starttime))
echo " Finished processDoc on $(date)."
echo " '$*' with PID '$BASHPID'"
echo " Processed $fileCount pages in ${elapsed}s."
# remove this PID from queue, wake up the next
echo "==bef=="
cat "$QUEUEFN"
grep -v "^$BASHPID" "$QUEUEFN" > "$QUEUEFN.tmp"
mv "$QUEUEFN.tmp" "$QUEUEFN"
echo "==aft=="
cat "$QUEUEFN"
[ "$(queueHead)" -eq 0 ] && return; # empty queue
echo " Waking up $(head -n1 "$QUEUEFN")"
kill -CONT "$(queueHead)"
}
removeDeskewArtifacts()
{
local fn="$1"
local xmax; xmax="$(convert -format "%[fx:w-1]" "$fn" info:)"
local ymax; ymax="$(convert -format "%[fx:h-1]" "$fn" info:)"
[ -z "$xmax" ] || [ -z "$ymax" ] && return
local scanbckg="rgb(213,220,220)"
local shavepx=$((RESOLUTION/10)) # 10th of an inch == 2.5mm
# cp "$fn" /tmp/ # for debugging
mogrify -fill "$scanbckg" \
-floodfill +$xmax+0 black \
-floodfill +$xmax+$ymax black \
-floodfill +0+$ymax black \
-floodfill +0+0 black \
-fuzz 10% -trim +repage -shave ${shavepx}x${shavepx} \
-brightness-contrast 7x7 \
"$fn"
}
batchScan()
{
local prefix="$1"
local ts="$2"
# test required file/directory permissions
[ -d "$OUT_DIR" ] || mkdir -p "$OUT_DIR"
if [ ! -w "$OUT_DIR" ]; then
echo "Current user '$(whoami)' does not have write"\
"permissions for output directory '$OUT_DIR'!"
exit 1
fi;
if [ ! -e "$WORK_DIR" ]; then
mkdir -p "$WORK_DIR";
chmod a+rx "$WORK_DIR"
fi;
if [ ! -w "$WORK_DIR" ]; then
echo "Current user '$(whoami)' does not have write"\
"permissions for work directory '$WORK_DIR'!"
exit 1
fi;
local lockfn="$WORK_DIR/$prefix"
if ! lockfile-create --retry 1 "$lockfn"; then
echo "Error: scanning already in progress!"
exit
fi;
echo " batchScan '$*' started on dev '$SCAN_DEVICE'"
local scandir; scandir="$(getTmpDir "$prefix")"
cd "$scandir" || return
echo "
################## Scanning ###################
"
local pattern="${prefix}_%03d.tif"
# always scanning both side of a sheet, 2 images/sheet
(scanimage \
-d "$SCAN_DEVICE" \
--source 'ADF Duplex' \
--mode Color \
--resolution $RESOLUTION \
--ald=yes --overscan On \
--page-width $WIDTH -x $WIDTH \
--page-height $HEIGHT -y $HEIGHT \
--swdeskew=yes --swcrop=yes \
--format=tiff --batch="$pattern" \
) & # scan in background
# first idx in dir: $(($(ls -1 scan_*.tif | head -n 1 | egrep -o '[[:digit:]]+')));
local idx=1
local lastScanTime; lastScanTime=$(date +%s)
local currentMode=single
local docdir=""
local logdir; logdir="$(logSubDir "$prefix" "$ts")"
# wait max $SCANTIMEOUT seconds for scanned images files to show up
while [ "$(($(date +%s)-lastScanTime))" -lt $SCANTIMEOUT ];
do
echo " .. $(($(date +%s)-lastScanTime))/${SCANTIMEOUT}s since last scan"
sleep 1; # check for results in 1sec intervals
# wait for the first 2 pages becoming available, check expected file names
local fn1; fn1="$(printf "$pattern" $((idx)))"
local fn2; fn2="$(printf "$pattern" $((idx+1)))"
if [ ! -f "$fn1" ] || [ ! -f "$fn2" ]; then continue; fi;
removeDeskewArtifacts "$fn1"
removeDeskewArtifacts "$fn2"
# evaluate: qr, blank or sth else?
local classifyLog1="$logdir/${fn1%*.tif}.log"
echo "classifyImg "$fn1" > '$classifyLog1'"
classifyImg "$fn1" > "$classifyLog1" 2>&1 &
local fn1PID=$!
local classifyLog2="$logdir/${fn2%*.tif}.log"
echo "classifyImg "$fn2" > '$classifyLog2'"
classifyImg "$fn2" > "$classifyLog2" 2>&1 &
local fn2PID=$!
echo " waiting for classifyImg PIDs: $fn1PID $fn2PID"
wait $fn1PID $fn2PID
# on mode switch create new doc dir, move there all files
if [ -f "$fn1.multi" ] || [ -f "$fn2.multi" ]; then
currentMode=multi
rm -f "$fn1" "$fn2" # remove scans of mode sheet
# TODO: check for empty docdir and skip possibly
# queue processing of the previous document
eval processDoc "$docdir" "$(timestamp doc)" &
# create a new document on mode switch
docdir="$(getTmpDir doc)"
elif [ -f "$fn1.single" ] || [ -f "$fn2.single" ]; then
rm -f "$fn1" "$fn2" # remove scans of mode sheet
# process previous multi sheet doc possibly
if [ "$currentMode" != single ]; then
eval processDoc "$docdir" "$(timestamp doc)" &
docdir="$(getTmpDir doc)"
fi
currentMode=single
fi
# create new doc dir on first run, later it is set after start of processing
[ -z "$docdir" ] && docdir="$(getTmpDir doc)"
rm -f ./*.single ./*.multi ./*.blank
# move scanned images to current document dir
if [ -f "$fn1" ] || [ -f "$fn2" ]; then
local fns; fns="$(find . -mindepth 1 -maxdepth 1 \
-regex ".*\\($fn1\\|$fn2\\)" -printf '%p ')"
echo " -> $currentMode mode, moving $fns to '$docdir'."
mv -f "$fn1" "$fn2" "$docdir" 2> /dev/null
# process directly after copying in single mode
if [ "$currentMode" == single ]; then
eval processDoc "$docdir" "$(timestamp doc)" &
docdir="$(getTmpDir doc)"
fi
fi
ls -1; # show directory contents in log file
idx=$((idx+2))
lastScanTime=$(date +%s)
done
# cleanup, scanimage may still run in case of paper jam
killall scanimage 2> /dev/null # FIXME: remember scanimage PID for that?
# the following would kill this running script as well -> not appropriate
# local scriptDir="$(dirname $0)"
# kill $(ps ax | grep "$scriptDir/.*\\.sh" | grep -v ' grep' \
# | awk '{print $1}')
# process the last multi document, after timeout of scanning loop
[ "$currentMode" == multi ] && eval processDoc "$docdir" "$(timestamp doc)" &
sleep 2
# directory empty, remove it
cd ..
delIntermediate || rm -Rf "$scandir"
if [ -f "$QUEUEFN" ]; then
echo " Done with scanning, current queue:"
cat "$QUEUEFN"
fi
echo " finished batchScan '$*' '$BASHPID' $(date)"
lockfile-remove "$lockfn"
}
userExists() # returns a 'true' return code if the user exists already
{
id -u "$1" > /dev/null 2>&1
}
runInstallFirst()
{
echo "Please run '$(ls install*.sh)' first."
}
main()
{
# load config file, if there is any
if [ ! -f "$CFGPATH" ]; then
echo "Config file '$CFGPATH' not found!"
runInstallFirst
exit 1
fi
source "$CFGPATH"
# check for the correct user
if ! userExists "$SCANUSER"; then
echo "Configured user '$SCANUSER' does not exist!"
runInstallFirst
exit 1
fi
if [ "$(whoami)" != "$SCANUSER" ]; then
echo "Wrong user, this script expects to be run by user '$SCANUSER'!"
runInstallFirst
exit 1
fi
# output directory for resulting PDF files, expected in current users $HOME
OUT_DIR="$(cd && cd "$OUT_SUBDIR" && pwd)"
if [ ! -d "$OUT_DIR" ]; then
echo "Could not determine output directory!"
exit 1
fi
# working directory for intermediate files such as scanned images
# a persistent location, preferably not in /tmp to survive crash/reboot
WORK_DIR="$OUT_DIR/work"
# common queue for multiple instances
QUEUEFN="$WORK_DIR/queue"
LOG_DIR="$OUT_DIR/log"
TIMESTAMPFN="$(mktemp)"
if [ "$CMD" = "sheets" ]; then
# for any arguments provided, create available qr command sheets
eval createCommandSheets "$(timestamp command-sheets)"
elif [ "$CMD" = "process" ]; then
# process given document dir (can be used if earlier process of this doc was killed)
shift
processDoc $@
else
eval batchScan "$(timestamp $SCAN_PREFIX)"
# do not wait, this would include processing of all documents as well
# wait # for all children
chmod -fR a+rx "$OUT_DIR"/*
# do not remove the queue, next batch scan will append jobs
# delIntermediate || rm -f "$QUEUEFN"
fi
# remove timestamp file, if any
rm -f "$TIMESTAMPFN"
}
main $@
# vim: set ts=4 sts=4 sw=4 tw=0: