create djvu books for subdirs of scanned images into low and hi res

make_djvu.sh

#!/bin/sh

UNPAPER_OPTS_COMMON=" --mask-scan-threshold 0.01 --dpi 600 --mask-scan-size 100"
UNPAPER_OPTS_ST1=" --deskew-scan-size 5000 -dv 0.5"
UNPAPER_OPTS_ST2=" --no-noisefilter --no-blackfilter --no-grayfilter --no-blurfilter --no-deskew --border-align top --border-margin 150"


sdir=`pwd` #starting point; it is important that you start at the right place
dir=`find . -type d` #will save the sub/directory tree in var

for i in $dir; do
  cd $i #go into directory
	for file in $(ls *.jpg | sort -n); do
		echo "converting  : $file"
		c44 $file ${file%%.*}_hi.djvu
		convert $file ${file%%.*}_low.pbm;
		unpaper --overwrite $UNPAPER_OPTS_COMMON $UNPAPER_OPTS_ST1 ${file%%.*}_low.pbm ${file%%.*}_1_low.pbm 
		unpaper --overwrite $UNPAPER_OPTS_COMMON $UNPAPER_OPTS_ST2 ${file%%.*}_1_low.pbm ${file%%.*}_low.pbm 
		cjb2 -clean ${file%%.*}_low.pbm  ${file%%.*}_low.djvu
	done

	new_name=$(echo "$i" | tr -cs "[:alnum:]_" _)
	echo "creating book file : $new_name.djvu"
	djvm -c ${new_name}_hi.djvu $(ls *_hi.djvu | sort -n)
	djvm -c ${new_name}_low.djvu $(ls *_low.djvu | sort -n)	
	echo "done."

	echo "cleaning up.."
	for file in $(ls *.jpg | sort -n); do
		rm -f ${file%%.*}_hi.djvu
		rm -f ${file%%.*}_low.djvu
		rm -f ${file%%.*}_low.pbm
		rm -f ${file%%.*}_1_low.pbm 		
	done
	cd ..
  cd $sdir #go back to start
done