Tessnet2 Init-Method crashes with certain tessdata path

Question

I'm using the Tessnet2 assembly (which uses Tesseract) to do OCR. Unfortunately the programm crashes without any exception after I call the init method:

tessnet2.Tesseract ocr = new tessnet2.Tesseract();
ocr.Init(@"D:\Test\Tessdata\german", "deu", false);

The german folder contains the following tesseract 2 word data:

• deu.DangAmgigs
• deu.freq-dawg
• deu.inttemp
• deu.normproto
• deu.pffmtable
• deu.unicharset
• deu.user-words
• deu.word-dawg

If I use null for the path it works fine because I installed tesseract on my machine. However I need a solution with the path because where the programm will be deplyoed it is not ensured that tesseract is installed.

Answer 1

The problem is that if you have Tesseract installed there is an environment variable set ( TESSDATA_PREFIX )which contains the path of the tessdata. To use your own path it is necessary to uninstall Tesseract and delete the environment variable.

Answer 2

Try the path:
     @"D:\Test\Tessdata"