mirror of
https://github.com/rocketraman/sane-scan-pdf.git
synced 2025-05-16 15:40:35 -07:00
d33c8caa71
For some reason when piping the output of pnmtops directly to ps2pdf, conversion is very slow (especially for color scans). When writing to an intermediate temporary file, conversion is fast. Before: ________________________________________________________ Executed in 19.20 secs fish external usr time 4.01 secs 0.32 millis 4.01 secs sys time 20.63 secs 5.30 millis 20.62 secs After: ________________________________________________________ Executed in 368.06 millis fish external usr time 378.06 millis 0.00 millis 378.06 millis sys time 100.00 millis 2.79 millis 97.21 millis An improvement of over 50 times! This should resolve #19.
139 lines
4.3 KiB
Bash
Executable File
139 lines
4.3 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 [[ $# < 1 ]]; then
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usage
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exit 1
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fi
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if [[ "$UNPAPER" == "" || "$SEARCHABLE" == "" || "$RESOLUTION" == "" || "$RESOLUTION" == "" || "$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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TIMEVERBOSE=
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if [[ $VERBOSE == 1 ]]; then
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TIMEVERBOSE=time
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fi
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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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log "-------------------------------------------------------------------------------"
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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 == 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 $TIMEVERBOSE unpaper $UNPAPERVERBOSE --no-mask-scan --overwrite --dpi $RESOLUTION --no-blackfilter $IMAGE_FILE $PP_PREFIX$IMAGE_FILE | logstdout
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runconstrained $TIMEVERBOSE unpaper $UNPAPERVERBOSE --overwrite --dpi $RESOLUTION $IMAGE_PATH $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE | logstdout
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fi
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if [[ $SEARCHABLE == 1 ]]; then
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log "Converting image data to searchable pdf..."
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# tesseract uses the input's DPI header, we need to convert to a format that supports this (like tiff)
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log "...Running convert"
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runconstrained $TIMEVERBOSE convert -density ${RESOLUTION}x${RESOLUTION} -units PixelsPerInch $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.tiff | logstdout
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log "...Running tesseract"
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runconstrained $TIMEVERBOSE tesseract $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.tiff $IMAGE_DIR/${IMAGE_FILE%.*} -l $LANGUAGE pdf | logstdout
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[[ -f $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.tiff ]] && rm $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.tiff
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else
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log "Converting image data to pdf..."
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if [[ "$PGWIDTHIN" == "" || "$PGHEIGHTIN" == "" ]]; then
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PAGEOPTS="-equalpixels -dpi=$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 "...Running pnmtops on $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE using page options: $PAGEOPTS"
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runconstrained $TIMEVERBOSE pnmtops $PNMVERBOSE $PAGEOPTS $IMAGE_DIR/$PP_PREFIX$IMAGE_FILE > $IMAGE_DIR/${IMAGE_FILE}.ps | logstdout
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log "...Running ps2pdf on $IMAGE_DIR/${IMAGE_FILE}.ps"
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runconstrained $TIMEVERBOSE ps2pdf $PS2PDF_OPTS $IMAGE_DIR/${IMAGE_FILE}.ps $IMAGE_DIR/${IMAGE_FILE}.pdf | logstdout
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[[ -f $IMAGE_DIR/${IMAGE_FILE}.ps ]] && rm $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}.ps
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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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[[ -f $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE} ]] && rm $IMAGE_DIR/$PP_PREFIX${IMAGE_FILE}
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log ""
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log "Scan page 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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