You mean this, right?
tessnet2.Tesseract ocr = new tessnet2.Tesseract();
ocr.SetVariable("tessedit_char_whitelist",
"0123456789"); // If digit only
ocr.Init(null, "eng", false); // To use correct tessdata
ocr.SetVariable("tessedit_char_whitelist",
"0123456789"); // If digit only
List<tessnet2.Word> result = ocr.DoOCR(bmp,
Rectangle.Empty);
return result[0].Text;
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