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#!/bin/sh
# See COPYING file for copyright and license details.
#
# Makes a DjVu with embedded text extracted by tesseract
# Requires imagemagick, djvulibre and tesseract 3
#
# Note that this doesn't use bounding box info, so that text
# reflows much better.
test $# -ne 1 && echo "Usage: $0 bookdir" && exit 1
cd "$1" || exit 1
for i in `ls`
do
echo "$i"
# create djvu compressed version
convert "$i" "$i.ppm"
c44 "$i.ppm" "$i.djvu"
# create a much bigger version of the page image, for better
# tesseract accuracy
width=`identify "$i" |awk '{print $3}'|awk -F x '{print $1}'`
height=`identify "$i" |awk '{print $3}'|awk -F x '{print $2}'`
bigwidth=`expr $width \* 4`
convert "$i" -geometry ${bigwidth}x "$i.tif"
tesseract "$i.tif" "$i" 2>&1 | sed '/Tesseract Open Source OCR Engine/d'
# convert tesseract output into djvused input
(printf "(page 0 0 $width $height \"";sed 's/"/\\"/g;'"s/\'/\\\'/g" < "$i.txt";printf \"")\n") > "$i.djvutxt"
djvused "$i.djvu" -e "select 1; set-txt $i.djvutxt" -s
rm -f "$i.ppm" "$i.tif" "$i.txt" "$i.djvutxt"
done
djvm -c book.djvu *.djvu
rm -f [0-9]*djvu
echo "$1/book.djvu"
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