c#OCR识别验证码

  1   public partial class GetValidCode : Form
  2     {
  3        private ValidImg _mValidImg;
  4        private Bitmap _testMap;
  5        private Bitmap[] arrmap =null;
  6         public GetValidCode()
  7         {
  8             InitializeComponent();
  9         }
 10        
 11         private void GetValidCode_Load(object sender, EventArgs e)
 12         {
 13             #region 得到验证码图片
 14             _mValidImg = new ValidImg();
 15             _testMap = _mValidImg.GetValidImg();
 16             Bitmap map = new Bitmap(_mValidImg.StrPath);
 17             pbImg.Image = map;
 18             //arrmap = GetSplitPics(_testMap, 1, 5);
 19             //DisplaySplitImg(arrmap);
 20             #endregion
 21         }
 22       
 23 
 24         private void btnGetContent_Click(object sender, EventArgs e)
 25         {
 26             if (true)
 27             {
 28                 #region TestOne
 29                 _testMap = new Bitmap(_mValidImg.StrPath);
 30 
 31                     UnCodebase ud = new UnCodebase(_testMap);
 32                     _testMap = ud.GrayByPixels();
 33                     ud.ClearNoise(128, 2);
 34                     pbImg.Image = _testMap;
 35 
 36                     tessnet2.Tesseract ocr = new tessnet2.Tesseract();//声明一个OCR类
 37                     ocr.SetVariable("tessedit_char_whitelist", "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXZY0123456789"); //设置识别变量，当前只能识别数字。
 38                     ocr.Init(Application.StartupPath + @"\\tmpe", "eng", true); //应用当前语言包。注，Tessnet2是支持多国语的。语言包下载链接：http://code.google.com/p/tesseract-ocr/downloads/list
 39 
 40                     List result = ocr.DoOCR(_testMap, Rectangle.Empty);//执行识别操作
 41                     string code = result[0].Text;
 42                     txtContent.Text += code;
 43 
 44                 #endregion
 45             }
 46         }
 47 
 48 
 49         /// 

 50         /// 得到图片有效区域，使切分图片更加精确
 51         /// 
 52         /// 
 53         /// 
 54         private Bitmap CutMap(Bitmap _bitmap)
 55         {
 56             Rectangle rg = new Rectangle(int.Parse(updX.Value.ToString()), int.Parse(updY.Value.ToString()), _bitmap.Width - int.Parse(updW.Value.ToString()), _bitmap.Height - int.Parse(updH.Value.ToString()));
 57             //Rectangle rg = new Rectangle(1, 0, _bitmap.Width - 10, _bitmap.Height );
 58             Bitmap bitmap = _bitmap.Clone(rg, _bitmap.PixelFormat);
 59             return bitmap;
 60 
 61         }
 62 
 63         /// 

 64         /// 切分图片
 65         /// 
 66         /// 
 67         /// 
 68         /// 
 69         /// 
 70         private Bitmap[] SplitImg(Bitmap _bitmap, int row, int col)
 71         {
 72             int singW = _bitmap.Width / row;
 73             int singH = _bitmap.Height / col;
 74             Bitmap[] arrmap = new Bitmap[row * col];
 75             Rectangle rect;
 76             for (int i = 0; i )
 77             {
 78                 for (int j = 0; j )
 79                 {
 80                     rect = new Rectangle(j * singW, i * singH, singW, singH);
 81                     arrmap[i * row + j] = _bitmap.Clone(rect, _bitmap.PixelFormat);
 82                 }
 83             }
 84 
 85             return arrmap;
 86         }
 87 
 88         /// 

 89         /// 展示
 90         /// 
 91         /// 
 92         private void DisplaySplitImg(Bitmap[] arrmap)
 93         {
 94             for (int i = 0; i )
 95             {
 96                 ControlCollection cc = this.Controls as ControlCollection;
 97                 foreach (Control item in cc)
 98                 {
 99                     if (item is PictureBox)
100                     {
101                         PictureBox pb = item as PictureBox;
102                         int index=i+1;
103                         if (pb.Name=="pb"+index)
104                         {
105                             pb.Image = arrmap[i];
106                             break;
107                         }
108                     }
109                 }
110                 
111             }
112         }
113 
114         private void GetValidCode_FormClosed(object sender, FormClosedEventArgs e)
115         {
116             this.Dispose();
117             if (File.Exists(_mValidImg.StrPath))
118             {
119                 File.Delete(_mValidImg.StrPath);
120             }
121         }
122       
123     }

    public class ValidImg
    {
        private string _strPath=string.Empty;

        public string StrPath
        {
            get { return _strPath; }
            set { _strPath = value; }
        }
        public ValidImg()
        {
            Directory.CreateDirectory(@"tmpImg");
        }
        public Bitmap GetValidImg()
        {
            Bitmap _ResultBitMap;
            using (Bitmap img = new Bitmap(120, 30))
            {
                using (Graphics g = Graphics.FromImage(img))
                {
                    string strCode = GetCode(5);

                    Random r = new Random();
                    g.Clear(Color.White);
                    for (int i = 0; i <25; i++)
                    {
                        int x1 = r.Next(0, img.Width);
                        int x2 = r.Next(0, img.Width);
                        int y2 = r.Next(0, img.Height);
                        int y1 = r.Next(0, img.Height);
                        g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); // 随机产生图片的背景噪线
                    }
                    Font font = new Font("楷体", 18, (System.Drawing.FontStyle.Bold));
                    LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Blue, Color.DarkRed, 3, true);
                    g.DrawString(strCode, font, brush, 5, 2);   //绘制随机字符

                    g.DrawRectangle(new Pen(Color.Silver), 0, 0, img.Width - 1, img.Height - 1);   //绘制图片的前景噪点

                    _ResultBitMap = img;
                    DateTime dt = DateTime.Now;
                    
                    string strImgFileName = dt.ToFileTime().ToString()+ ".jpg";
                    _strPath = Path.Combine("tmpImg", strImgFileName);
                    _ResultBitMap.Save(_strPath, System.Drawing.Imaging.ImageFormat.Jpeg);
                }
            }
            return _ResultBitMap;
        }


        private string GetCode(int num)
        {
            string str = "ABCD1EF2GH3IJ4KL5MN6P7QR8ST9UVWXYZ";
            Random r = new Random();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i )
            {
                sb.Append(str.Substring(r.Next(0, str.Length), 1));
            }
            return sb.ToString();
        }
    }