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#!/bin/bash
NC='\033[0m'
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
msg_info() {
echo -e "${GREEN}$1${NC}"
}
msg_warn() {
echo -e "${YELLOW}$1${NC}"
}
msg_error() {
echo -e "${RED}$1${NC}"
}
print_help() {
echo
echo "scan2pdf - turn document pictures into searchable PDFs"
echo
echo " scan2pdf uses unpaper to clean the input image and"
echo " tesseract to extract the text and bundle everything in a"
echo " single PDF. imagemagick is used to prepare the input for"
echo " unpaper, and sxiv to selectively repeat the cleaning"
echo " process, when needed. Results may vary, depending on the"
echo " quality of the input image and the options used with"
echo " unpaper."
echo
echo "USAGE:"
echo " unpaper [OPTION ...] FILE [...]"
echo
echo "OPTIONs are:"
echo " -o | --output <name>"
echo " provide a name for the output file (without extension)"
echo " -h | --help"
echo " print this help"
echo
}
batch_convert() {
echo
echo "Batch converting scans to PNM."
for IMG in "${INPUT[@]}"
do
IMG_BASE=`basename $IMG`
IMG_BASE_PNM="${IMG_BASE%.*}.pnm"
echo "Converting $IMG -> $TEMP/$IMG_BASE_PNM"
convert "$IMG" "$TEMP/$IMG_BASE_PNM"
TO_PROCESS+=( "$TEMP/$IMG_BASE_PNM" )
done
}
batch_unpaper() {
echo
echo "Batch unpaper scans."
# Prompt user to get additional unpaper options. It is possible to
# access the man page as well.
UNPAPER_MORE_OPTIONS=()
echo "Using the following options: ${UNPAPER_OPTIONS[@]}"
echo "Specify additional options (quit|man|<option value>):"
QUIT=0
while [ "$QUIT" -eq 0 ]; do
echo -n "> "
read OPTION
case "$OPTION" in
q|quit)
QUIT=1
;;
m|man)
man unpaper
;;
*)
UNPAPER_MORE_OPTIONS=( $OPTION )
;;
esac
echo "Using the following options: ${UNPAPER_OPTIONS[@]} ${UNPAPER_MORE_OPTIONS[@]}"
done
for IMG_PNM in "$@"
do
IMG_BASE_PNM=`basename "$IMG_PNM"`
UNPAPER_IMG_BASE_PNM="unpaper_$IMG_BASE_PNM"
# Possibly remove temp files from previous iterations
rm -f "$TEMP/$UNPAPER_IMG_BASE_PNM"
unpaper "${UNPAPER_OPTIONS[@]}" "${UNPAPER_MORE_OPTIONS[@]}" "$TEMP/$IMG_BASE_PNM" "$TEMP/$UNPAPER_IMG_BASE_PNM"
done
TO_PROCESS=()
REVIEW=`\ls "$TEMP"/unpaper_* | sxiv -iopqt | sed "s|^$TEMP/unpaper_|$TEMP/|"`
for FILE in $REVIEW
do
TO_PROCESS+=( "$FILE" )
done
}
TEMP=`mktemp -d`
UNPAPER_OPTIONS=(--grayfilter-size 10,10 --grayfilter-step 5,5 --post-border 100,100,100,100 --border-align top --border-margin 100,100 --post-size a4)
INPUT=()
TO_PROCESS=()
OUTPUT=out
while [[ $# -gt 0 ]]; do
case $1 in
-h|--help)
print_help
exit 0
;;
-o|--output)
if [[ $# -ge 2 ]]; then
OUTPUT=$2
shift ; shift
else
msg_error "No value found for flag $1!"
print_help
exit 2
fi
;;
*)
INPUT+=( "$1")
shift
;;
esac
done
# Convert all images to PNM
batch_convert "$@"
# Batch unpaper scans until user is ok with the result
while [[ ${TO_PROCESS[@]} ]]; do
batch_unpaper "${TO_PROCESS[@]}"
done
echo
echo "Run tesseract on processed scans."
pushd "$TEMP" >/dev/null
\ls unpaper_* | tesseract - output --dpi 300 pdf
popd >/dev/null
echo
echo "Removing temporary files."
mv "$TEMP"/output.pdf ./
rm -rf "$TEMP"
|
