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explain and improve script

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This commit is contained in:
Uwe Steinmann 2025-10-23 17:33:03 +02:00
parent c188f65112
commit a4aa705fac
1 changed files with 25 additions and 21 deletions
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doc/README.ocr
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@ -4,14 +4,19 @@ OCR
SeedDMS itself has no support for optical character recognition (OCR) SeedDMS itself has no support for optical character recognition (OCR)
because it does not care about the content of file. Though, external because it does not care about the content of file. Though, external
OCR software can be used to convert an image into text and index it OCR software can be used to convert an image into text and index it
by the full text search engine. by the full text search engine. From SeedDMS point of view, it would
be sufficient to have a conversion service which converts an image
into text. This can be implemented in any possible way, but most
likely as a SeedDMS extension.
The following script can be use to convert a scanned image into pdf The following script can be use to convert a pdf with scanned images
with a text layer added. The script actually takes this file to into a text. The script converts any page into a image, runs it through
ran it through pdftotext. It was published in the seeddms forum tesseract, which creates a pdf again containing a text layer. All those
pdf documents will be united into a single pdf and through `pdftotext` again.
It was published in the SeedDMS forum
https://sourceforge.net/p/seeddms/discussion/general/thread/4ec5973d/ https://sourceforge.net/p/seeddms/discussion/general/thread/4ec5973d/
```
#!/bin/bash #!/bin/bash
inputpdf=$1 inputpdf=$1
temp_folder=/tmp/seedinput/$(date +"%Y_%m_%d_%H%M%S")/ temp_folder=/tmp/seedinput/$(date +"%Y_%m_%d_%H%M%S")/
@ -27,15 +32,13 @@ do
done done
if ( set -o noclobber; echo "locked" > "$lockfile"/"`basename $0`"); then if ( set -o noclobber; echo "locked" > "$lockfile"/"`basename $0`"); then
trap 'rm -f "$lockfile"/"`basename $0`"; echo $(date) " Lock file will be deleted: " $lockfile"/"`basename $0` Aufrufparameter: $* >> $protokolldatei ;rm -r $temp_folder; exit $?' INT TERM KILL EXIT
trap 'rm -f "$lockfile"/"`basename $0`"; echo $(date) " Lockdatei wird geloescht: " $lockfile"/"`basename $0` Aufrufparameter: $* >> $protokolldatei ;rm -r $temp_folder; exit $?' INT TERM KILL EXIT # write date and script name into log file
#das Datum mit dem Scriptnamen in die Protokolldatei schreiben echo $(date) " Lock file created: " $lockfile"/"`basename $0` >> $protokolldatei
echo $(date) " Lockdatei erstellt: " $lockfile"/"`basename $0` >> $protokolldatei
else else
#Script beenden falls Lockdatei nicht erstellt werden konnte # Exit script if lock file could not be created
echo $(date) " Programm wird beendet, Lockdatei konnte nicht erstellt werden: $lockfile"/"`basename $0` Aufrufparameter: $* " >> $protokolldatei echo $(date) " Script will exit, because lock file could not be created: $lockfile"/"`basename $0` Aufrufparameter: $* " >> $protokolldatei
exit 1 exit 1
fi fi
mkdir -p $temp_folder mkdir -p $temp_folder
@ -44,16 +47,17 @@ $(pdftotext -raw $1 - 1> $temp_folder''tmp.txt )
pdf_contents=`cat $temp_folder''tmp.txt` pdf_contents=`cat $temp_folder''tmp.txt`
pdf_contents=`echo "$pdf_contents" | tr -dc '[:print:]'` pdf_contents=`echo "$pdf_contents" | tr -dc '[:print:]'`
if [ -z "$pdf_contents" ]; then if [ -z "$pdf_contents" ]; then
convert -density 300 -quality 95 $inputpdf +adjoin $temp_folder''image%03d.jpg convert -density 300 -quality 95 $inputpdf +adjoin $temp_folder''image%03d.jpg
find $temp_folder -name '*.jpg'| parallel --gnu -j $cores tesseract -l deu --psm 6 {} {} pdf find $temp_folder -name '*.jpg'| parallel --gnu -j $cores tesseract -l deu --psm 6 {} {} pdf
num=`find $temp_folder -name '*.pdf'| wc -l` num=`find $temp_folder -name '*.pdf'| wc -l`
if [ "$num" -gt "1" ]; then if [ "$num" -gt "1" ]; then
pdfunite $temp_folder*.pdf $temp_folder''tmp.pdf pdfunite $temp_folder*.pdf $temp_folder''tmp.pdf
else else
mv $temp_folder*.pdf $temp_folder''tmp.pdf mv $temp_folder*.pdf $temp_folder''tmp.pdf
fi fi
pdftotext $temp_folder''tmp.pdf $temp_folder''tmp.txt pdftotext $temp_folder''tmp.pdf $temp_folder''tmp.txt
mv $temp_folder''tmp.pdf $1 mv $temp_folder''tmp.pdf $1
fi fi
cat $temp_folder''tmp.txt cat $temp_folder''tmp.txt
```