c# - c# tesseract2 ocr 识别 2 而不是 3

Question

_{（来源：askdev.ru）}

_{（来源：askdev.ru）}

结果，我有 298 和 288。

tessnet2.Tesseract ocr = new tessnet2.Tesseract();
ocr.SetVariable("tessedit_char_whitelist", "$,0123456789");
ocr.Init("C:\\tessdata\\", "eng", false); 

Bitmap tmp = wbbmp.Clone(rectM[5], System.Drawing.Imaging.PixelFormat.Format24bppRgb);

List<tessnet2.Word> n = ocr.DoOCR(tmp, new Rectangle(0,0,75,21));