modifying traineddata without retraining possible?

[Nikolai Krot]

Hi all,

I would like to know if I can just unpack-modify-pack files from traineddata and get an improvement in OCR (i am using tesseract 3.04). More specifically, I want to add to characters (like section character §) and new words to the dictionary. Do I need to re-train tesseract or it will "just use" new traineddata file?

Or maybe a mixed method: some of the below files require retraining and others do not?

1. deu.bigram-dawg
2. deu.freq-dawg
3. deu.inttemp
4. deu.normproto
5. deu.number-dawg
6. deu.params-model
7. deu.pffmtable
8. deu.punc-dawg
9. deu.shapetable
10. deu.traineddata
11. deu.unicharambigs
12. deu.unicharset
13. deu.word-dawg

I did a short test with extending the wordlist by adding words from one document and do not see any significant improvement. Maybe I am doing something wrong.

Thanks in advance and best regards,
Nikolai KROT