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I am currently working on a project for android using Tesseract OCR. I was hoping to fine-tune the results given to the user by adding a dictionary. According to tesseract OCR wiki, the best way to go about this would be to

Replace tessdata/eng.user-words with your own word list, in the same format - UTF8 text, one word per line.

However there is no eng.user-words file in the tessdata folder, I assume that if I just make a text file with my dictionary in it, it will never be used...

Has anybody had a similar experience and knows what to do?

Sabito stands with Ukraine
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TomSelleck
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1 Answers1

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If you're using tesseract 3 (which I assume you are). You'll have to rebuild your eng.trainddata file.

I intended to replace the word-dawg file completely to try to get better results (ie - the words I'm detecting are always the same).

You'll need combine_tessdata and wordlist2dawg executables in the training directory when you compile tesseract.

  1. unpack everything (i did this just to back up my eng.word-dawg, you'll also need the unicharset later)

    ./combine_tessdata -u eng.traineddata

  2. create a textfile of your wordlist (wordlistfile)

  3. create a eng.word-dawg

    ./wordlist2dawg wordlistfile eng.word-dawg traineddat_backup/.unicharset

  4. replace the word-dawg file

    ./combine_tessdata -o eng.traineddata eng.word-dawg

that should be it.

Sabito stands with Ukraine
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roocell
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    I am trying to execute this step 3 but having this error `Loading unicharset from 'traineddat_backup/.unicharset' Failed to load unicharset from 'traineddat_backup/.unicharset'` Kindly help me I am trying to do it on Ubuntu 12.04 and tesseract 3.02. – Muaz Usmani Dec 24 '13 at 20:23
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    @MuhammadMuaz: `traineddat_backup/.unicharset` is the path to folder of the output of 1st cmd. If the first cmd was `./combine_tessdata -u ita.traineddata /path/to/folder/tmp/ita.` the 3rd is `./wordlist2dawg wordlist ita.word-dawg /path/to/folder/tmp/ita.unicharset`. Hope it helps, I throw away 30 minutes on that. – Tenaciousd93 Dec 04 '14 at 11:04