Bash script to scan documents to PDF.

pixma2pdf.sh

#!/bin/bash
#-----------------------------------------------------------------------------
# pixma2pdf.sh version 3.0
#
# Copyright (c) 2009, 2013 Torkild U. Resheim  - torkildr@gmail.com
# Released under the Eclipse Public License version 1.0
#-----------------------------------------------------------------------------
t=$(tempfile) || exit
trap "rm -f -- '$t'" EXIT

mkdir documents

title="Canon Pixma - Scan to PDF"
dialog --title "$title" --checklist "Scan options" 10 50 10 \
    multi "Scan multiple documents" on \
	mail "Send document in e-mail" off \
	pause "Confirm between pages" off 2>$t

# Check for cancel
if [ $? == 1 ] ; then
	exit 0
fi

options=$(cat $t)
if [[ "$options" =~ "mail" ]] ; then
	dialog --title "$title" --inputbox "The address to mail to" 8 40 $address 2>$t
	address=$(cat $t)
fi
dialog --title "$title" --radiolist "Scanner resolution" 11 40 10 \
    75 "75dpi Screen" off \
    150 "150dpi" off \
    300 "300dpi Print" on \
    600 "600dpi" off 2>$t

# Check for cancel
if [ $? == 1 ] ; then
	exit 0
fi

resolution=$(cat $t)
dialog --title "$title" --radiolist "Page size" 11 40 10 \
	a4 "A4" on \
	a5 "A5" off \
	b5 "B5" off \
	letter "Letter" off 2>$t

# Check for cancel
if [ $? == 1 ] ; then
	exit 0
fi
pages=1
paperSize=$(cat $t)
if [[ "$options" = "multi" ]] ; then
    dialog --title "$title" --inputbox "The number of pages in document" 8 40 1 2>$t
    pages=$(cat $t)
fi
# Check for cancel
if [ $? == 1 ] ; then
    exit 0
fi

# Assume the scanner contains at least one sheet
sheets=1
while [ $sheets -eq 1 ] ; do
    i=1
    while [ $i -le $pages ] ; do
        if [[ "$options" =~ "pause" ]] ; then
            dialog --title "$title" --msgbox "Prepare to scan page $i" 8 40
        fi
        echo 10 | dialog --title "$title" --gauge "Scanning page $i of $pages" 8 40 0

        # Perform the scan
        sudo pixma_scan -a -r $resolution -v 1 -o scan_$i.pnm

        # Exit if there was an error
        if [ $? -ne 0 ] ; then
            exit $?
        fi

        # Attempt to crop the image
        pnmcrop -left -right -top -bottom -sides scan_$i.pnm > cropped_$i.pnm

        # Remove the original image
        sudo rm scan_$i.pnm

        # Convert to PostScript
        pnmtops -equalpixels -dpi=$resolution cropped_$i.pnm > scan_$i.ps
        rm cropped_$i.pnm

        # Test for more pages in the document
        raspistill -roi 0.08,0.65,0.10,0.07 -w 256 -h 256 -br 90 -co 100 -mm average -ISO 100 -o camera.jpg
        values=$(convert camera.jpg -threshold 50% -format %c histogram:info:- | tr -s ':' | cut -d ':' -f 1)
        black=$(echo $values | cut -d ' ' -f 1)
        white=$(echo $values | cut -d ' ' -f 2)
        if [ $black -gt $white ] ; then
            let pages++
        fi
        let i++
    done

    if [ $pages -gt 1 ] ; then
        # Merge the PostScript files to one
        gs -q -sPAPERSIZE=$paperSize -dNOPAUSE -sDEVICE=pswrite -dBATCH -sOutputFile=scan.ps *.ps
        # Remove the temporary postscript files
        for i in `seq $pages` ; do
            rm scan_$i.ps
        done
    else
        mv scan_1.ps scan.ps
    fi

    # Create the PDF file
    filename="raspiscan_"$(date +"%Y-%m-%d-%T").pdf
    ps2pdf -sPAPERSIZE=$paperSize scan.ps documents/$filename
    # Clean up
    rm scan.ps

    # Mail the PDF file
    if [[ "$options" =~ "mail" ]] ; then
        echo "Your scanned document is attached" | mutt -s "Scanned document" -a documents/$filename -- $address
    fi

    # Test if there are more sheets
    sudo pixma_scan -v 0 -t
    if [ $? == 1 ] ; then
        let sheets=0
    fi
done
# Clean up the temporary dialog files
rm -f -- "$t"
trap - EXIT
exit