mirror of
https://github.com/rocketraman/sane-scan-pdf.git
synced 2025-05-16 23:50:39 -07:00
130 lines
3.5 KiB
Bash
Executable File
130 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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# Usage: scan_perpage <imagefile>
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# where imagefile is the data just scanned
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# (specify this script to scanadf via -S)
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usage()
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{
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echo "Usage: $0 <imagefile>"
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echo "Set the following environment variables:"
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echo " UNPAPER"
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echo " SEARCHABLE"
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echo " LANGUAGE"
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echo " RESOLUTION"
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echo " PGWIDTHIN"
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echo " PGHEIGHTIN"
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echo " SKIP_EMPTY_PAGES"
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echo " PS2PDF_OPTS (optional)"
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echo " VERBOSE (optional)"
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echo " LOCKFILE (required if VERBOSE=1)"
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}
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log()
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{
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if [ $VERBOSE = 1 ]; then
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echo "scan_perpage: $1"
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fi
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}
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logstdout()
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{
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if [ $VERBOSE = 1 ]; then
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cat
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else
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cat > /dev/null
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fi
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}
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runconstrained()
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{
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if [ -x "$(command -v sem)" ]; then
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# use up to 75% of the cores available
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sem --jobs 75% --id scan_perpage --fg "$@"
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else
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"$@"
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fi
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}
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if [ $# -lt 1 ]; then
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usage
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exit 1
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fi
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if [ "$UNPAPER" == "" -o "$SEARCHABLE" == "" -o "$RESOLUTION" == "" -o "$RESOLUTION" == "" -o "$SKIP_EMPTY_PAGES" == "" ]; then
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usage
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exit 1
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fi
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IMAGE_PATH=$1
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IMAGE_DIR=$(dirname $1)
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IMAGE_FILE=$(basename $1)
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process_page() {
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log ""
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log "-------------------------------------------------------------------------------"
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log "Post-processing scanned page ${IMAGE_PATH}, deskew=$UNPAPER, searchable=$SEARCHABLE..."
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if [[ $SKIP_EMPTY_PAGES -eq 1 ]]; then
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PERCENTAGE_WHITE=$(convert "$IMAGE_PATH" -fuzz 0% -negate -threshold 0 -negate -format "%[fx:100*mean]" info:) || PERCENTAGE_WHITE=0
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log "$IMAGE_PATH has $PERCENTAGE_WHITE % white"
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else
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PERCENTAGE_WHITE=0
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fi
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PP_PREFIX=
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if (( $(echo "$PERCENTAGE_WHITE < 99.8" | bc -l) )); then
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if [ $UNPAPER -eq 1 ]; then
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log "Applying unpaper post-processing to image data..."
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PP_PREFIX="unpaper-"
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if [ $VERBOSE = 1 ]; then
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UNPAPERVERBOSE="-v"
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fi
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#runconstrained unpaper $UNPAPERVERBOSE --no-mask-scan --overwrite --dpi $RESOLUTION --no-blackfilter $IMAGE_FILE $PP_PREFIX$IMAGE_FILE | logstdout
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runconstrained unpaper $UNPAPERVERBOSE --overwrite --dpi $RESOLUTION $IMAGE_PATH $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE | logstdout
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fi
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log ""
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log "-------------------------------------------------------------------------------"
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if [ $SEARCHABLE -eq 1 ]; then
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log "Converting image data to searchable pdf..."
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runconstrained tesseract $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE $IMAGE_DIR/${IMAGE_FILE%.*} -l $LANGUAGE pdf | logstdout
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else
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log "Converting image data to pdf..."
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if [ "$PGWIDTHIN" == "" -o "$PGHEIGHTIN" == "" ]; then
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PAGEOPTS="-equalpixels -dpi=$RESOLUTION -noturn"
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else
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PAGEOPTS="-imagewidth $PGWIDTHIN -imageheight $PGHEIGHTIN"
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fi
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PNMVERBOSE=
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# older versions of pnmtops (Ubuntu, Debian) don't have the -verbose option, test for it
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if [[ $VERBOSE = 1 && ! "$(pnmtops -verbose 2>&1 < /dev/null)" =~ "unrecognized option" ]]; then
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PNMVERBOSE="-verbose"
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fi
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log "Using page options: $PAGEOPTS"
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runconstrained pnmtops $PNMVERBOSE $PAGEOPTS $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE | ps2pdf $PS2PDF_OPTS - > $IMAGE_DIR/${IMAGE_FILE%.*}.pdf | logstdout
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fi
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else
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log "Skipping empty page $IMAGE_FILE with white percentage $PERCENTAGE_WHITE"
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fi
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status=$?
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rm $IMAGE_PATH
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if [ -f $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE ]; then
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rm $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE
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fi
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log ""
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log "Scan processing done, status = $status"
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}
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if [ $VERBOSE = 1 ]; then
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(
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flock 200
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process_page
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) 200>$LOCKFILE
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else
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process_page
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fi;
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exit $status
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