i find this code for delphi. Author write, this 
tesseract-ocr<http://code.google.com/p/tesseract-ocr/> , 
and write this link 0o

  ocr1 := TOcr.Create(nil);
  ocr1.Active := true;
  Ocr1.StringParameter['tessedit_char_whitelist'] := '+- 0123456789'; // 
recognize numbers only (можно указывать черный и белый список)



    Ocr1.Picture.Graphic := png;
    Ocr1.Recognize;
    result := Ocr1.Text;

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