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#!/bin/sh
# See COPYING file for copyright and license details.
#
# Makes a text file with text extracted by tesseract
# Requires imagemagick and tesseract
#
# Note: Unfortunately tesseract works much better if one first
# makes the image to be OCRed significantly larger. This
# script therefore temporarily creates a larger file to
# feed to tesseract. These temporary large files are also
# converted to tiff format, so that they're readable by
# any version of tesseract.
for i in `ls *png`
do
echo "$i"
# create a much bigger version of the page image
width=`identify "$i" | awk '{print $3}' | sed 's/x.*//'`
bigwidth=`expr $width \* 4`
convert "$i" -geometry ${bigwidth}x "$i.big.tif"
# scan the page image
tesseract "$i.big.tif" "$i" 2>&1 | sed '/Tesseract Open Source OCR Engine/d'
# combine the page text with the rest of the book
cat "$i.txt" >> book.txt
# remove working files
rm -f "$i.big.tif" "$i.txt"
done
echo book.txt
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