验证码识别程序

string ur = "http://www.xici.net.co/";

CsQuery.CQ cs = CsQuery.CQ.CreateFromUrl(ur);

CQ data = cs.Select("#ip_list tr.odd");

string td = data.ToList().First().InnerHTML;

CQ ele = CQ.Create(td);

CQ tep1 = ele.Select("td:eq(1)");
CQ tep2 = ele.Select("td:eq(2)");
CQ tep3 = ele.Select("td:eq(5)");

string ip = tep1.ToList().First().InnerText;
string port = tep2.ToList().First().InnerText;
string type = tep3.ToList().First().InnerText;

  private string Ocr(Bitmap image)
        {
            var ocr = new Tesseract();
            ocr.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only
            image = BlackAndWhite(image, 0.8);//黑白处理，这个函数看下边  
            image = new Bitmap(image, image.Width * 3, image.Height * 3);//放大三倍  
            string path=Application.StartupPath+@"\tessdata\";
            ocr.Init(path, "eng", true);
            
            var result = ocr.DoOCR(image, Rectangle.Empty);
            string tep = "";
            foreach (Word word in result)
            {
                tep += word.Text;
            }
            return tep;
           
        }   

 public static Bitmap BlackAndWhite(Bitmap bitmap, Double hsb)
        {
            if (bitmap == null)
            {
                return null;
            }


            int width = bitmap.Width;
            int height = bitmap.Height;
            try
            {
                Bitmap bmpReturn = new Bitmap(width, height, PixelFormat.Format1bppIndexed);
                BitmapData srcBits = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
                BitmapData targetBits = bmpReturn.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format1bppIndexed);


                unsafe
                {
                    byte* pSrcBits = (byte*)srcBits.Scan0.ToPointer();
                    for (int h = 0; h < height; h++)
                    {
                        byte[] scan = new byte[(width + 7) / 8];
                        for (int w = 0; w < width; w++)
                        {
                            int r, g, b;
                            r = pSrcBits[2];
                            g = pSrcBits[1];
                            b = pSrcBits[0];


                            if (GetBrightness(r, g, b) >= hsb) scan[w / 8] |= (byte)(0x80 >> (w % 8));
                            pSrcBits += 3;
                        }
                        Marshal.Copy(scan, 0, (IntPtr)((int)targetBits.Scan0 + targetBits.Stride * h), scan.Length);
                        pSrcBits += srcBits.Stride - width * 3;
                    }
                    bmpReturn.UnlockBits(targetBits);
                    bitmap.UnlockBits(srcBits);
                    return bmpReturn;
                }
            }
            catch
            {
                return null;
            }


        }  

 private static float GetBrightness(int r, int g, int b)
        {
            float fR = ((float)r) / 255f;
            float fG = ((float)g) / 255f;
            float fB = ((float)b) / 255f;
            float fMax = fR;
            float fMin = fR;

            fMax = (fG > fMax) ? fG : fMax;
            fMax = (fB > fMax) ? fB : fMax;

            fMin = (fG < fMax) ? fG : fMax;
            fMin = (fB < fMax) ? fB : fMax;

            return ((fMax + fMin) / 2f);

        }