var image = new Bitmap(@"C:\OCRTest\number.jpg"); ocr.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only
//@"C:\OCRTest\tessdata" contains the language package,
proc.returncode, get_errors(error_string)) Error opening data file C:\\Program Files (x86)\\Tesseract-OCR/tessdata/ger.traineddata
Please make sure the