简易验证码识别

 1   try
 2             {
 3                 string url = "http://tyt.gzsports.gov.cn/sport/image.jsp?key=0.9328223555348814";
 4                 WebRequest request = WebRequest.Create(url);
 5                 WebResponse response = request.GetResponse();
 6                 Stream st = response.GetResponseStream();
 7 
 8                 pic_CheckCode.Image = Image.FromStream(st);
 9                 Bitmap bitmap = new Bitmap(pic_CheckCode.Image);
10                 UnCodebase ud = new UnCodebase(bitmap);
11                 ud.GrayByPixels();
12                 ud.ClearNoise(128, 2);
13 
14                 tessnet2.Tesseract ocr = new tessnet2.Tesseract();//声明一个OCR类
15                 ocr.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"); 
16                 ocr.Init(@"E:\语言包路径", "eng", false);
17                 List<tessnet2.Word> result = ocr.DoOCR(bitmap, Rectangle.Empty);//执行识别操作
18                 string code = result[0].Text;
19                 txt_Result.Text = code;
20             }
21             catch (Exception ex)
22             {
23             }