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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