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 程式師世界 >> 編程語言 >> .NET網頁編程 >> ASP.NET >> 關於ASP.NET >> 一個驗證碼識別的代碼

一個驗證碼識別的代碼

編輯:關於ASP.NET

字體固定,位置固定,干擾點和字體顏色深度沒有交叉,比如下面的樣例,是我前幾天幫朋友寫投票機刷票時碰到的一個具體案例。

基本就三步,確定特征碼-分割圖片-逐個匹配,代碼很簡單,不超過100行

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
namespace BmpNumber
{
  class Number
  {
    //數字特征庫
    static int[,] _num0 = new int[7, 10] { { 0, 0, 1, 1, 1, 1, 1, 1, 0, 0 }, { 0, 1, 1, 1, 1, 1, 1, 1, 1, 0 },
                    { 1, 1, 1, 0, 0, 0, 0, 1, 1, 1 }, { 1, 1, 0, 0, 0, 0, 0, 0, 1, 1 },
                    { 1, 1, 1, 0, 0, 0, 0, 1, 1, 1 }, { 0, 1, 1, 1, 1, 1, 1, 1, 1, 0 }, { 0, 0, 1, 1, 1, 1, 1, 1, 0, 0 } };
    static int[,] _num1 = new int[7, 10] { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 0, 1, 1, 0, 0, 0, 0, 0, 0 },
                    { 0, 1, 1, 0, 0, 0, 0, 0, 0, 0 }, { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
                    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } };
    static int[,] _num2 = new int[7, 10] { { 0, 0, 1, 1, 0, 0, 0, 0, 1, 1 }, { 0, 1, 1, 1, 0, 0, 0, 1, 1, 1 },
                    { 1, 1, 0, 0, 0, 0, 1, 1, 1, 1 }, { 1, 1, 0, 0, 0, 1, 1, 0, 1, 1 },
                    { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 }, { 1, 1, 1, 1, 1, 0, 0, 0, 1, 1 }, { 0, 1, 1, 1, 0, 0, 0, 0, 1, 1 } };
    static int[,] _num3 = new int[7, 10] { { 0, 0, 1, 0, 0, 0, 1, 1, 0, 0 }, { 0, 1, 1, 0, 0, 0, 1, 1, 1, 0 },
                    { 1, 1, 0, 0, 0, 0, 0, 1, 1, 1 }, { 1, 1, 0, 0, 1, 0, 0, 0, 1, 1 },
                    { 1, 1, 0, 0, 1, 0, 0, 0, 1, 1 }, { 1, 1, 1, 1, 1, 1, 1, 1, 1, 0 }, { 0, 1, 1, 1, 0, 1, 1, 1, 0, 0 } };
    static int[,] _num4 = new int[7, 10] { { 0, 0, 0, 0, 0, 1, 1, 1, 0, 0 }, { 0, 0, 0, 0, 1, 1, 1, 1, 0, 0 },
                    { 0, 0, 1, 1, 1, 0, 1, 1, 0, 0 }, { 0, 1, 1, 0, 0, 0, 1, 1, 0, 0 },
                    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 0, 0, 0, 0, 0, 0, 1, 1, 0, 0 } };
    static int[,] _num5 = new int[7, 10] { { 0, 0, 0, 1, 1, 1, 0, 1, 1, 0 }, { 1, 1, 1, 1, 1, 1, 0, 1, 1, 1 },
                    { 1, 1, 1, 1, 1, 0, 0, 0, 1, 1 }, { 1, 1, 0, 1, 1, 0, 0, 0, 1, 1 },
                    { 1, 1, 0, 1, 1, 0, 0, 0, 1, 1 }, { 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 }, { 1, 1, 0, 0, 0, 1, 1, 1, 0, 0 } };
    static int[,] _num6 = new int[7, 10] { { 0, 0, 1, 1, 1, 1, 1, 1, 0, 0 }, { 0, 1, 1, 1, 1, 1, 1, 1, 1, 0 },
                    { 1, 1, 1, 0, 1, 1, 0, 0, 1, 1 }, { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 },
                    { 1, 1, 0, 0, 1, 1, 0, 1, 1, 1 }, { 1, 1, 1, 0, 1, 1, 1, 1, 1, 1 }, { 0, 1, 1, 0, 0, 1, 1, 1, 1, 0 } };
    static int[,] _num7 = new int[7, 10] { { 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 }, { 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
                    { 1, 1, 0, 0, 0, 0, 0, 1, 1, 1 }, { 1, 1, 0, 0, 1, 1, 1, 1, 1, 1 },
                    { 1, 1, 0, 1, 1, 1, 0, 0, 0, 0 }, { 1, 1, 1, 1, 0, 0, 0, 0, 0, 0 }, { 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 } };
    static int[,] _num8 = new int[7, 10] { { 0, 1, 1, 1, 0, 0, 1, 1, 1, 0 }, { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
                    { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 }, { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 },
                    { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 }, { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 0, 1, 1, 1, 0, 0, 1, 1, 1, 0 } };
    static int[,] _num9 = new int[7, 10] { { 0, 1, 1, 1, 1, 0, 0, 1, 1, 0 }, { 1, 1, 1, 1, 1, 1, 0, 1, 1, 1 },
                    { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 }, { 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 },
                    { 1, 1, 0, 0, 1, 1, 0, 1, 1, 1 }, { 0, 1, 1, 1, 1, 1, 1, 1, 1, 0 }, { 0, 0, 1, 1, 1, 1, 1, 1, 0, 0 } };
    static private int[,] getNum(Bitmap bmp, int index)
    {
      //分割圖片
      int[,] _num = new int[7, 10];
      for (int i = index * 10 + 2; i < index * 10 + 9; i++)
      {
        for (int j = 6; j < 16; j++)
        {
          Color c = bmp.GetPixel(i, j);
          if (c.R < 100)
          {
            _num[i - 2 - index * 10, j - 6] = 1;
          }
        }
      }
      return _num;
    }
    static private int CheckNumber(int[,] number)
    {
      if (CheckNumber(_num0, number) == true) return 0;
      if (CheckNumber(_num1, number) == true) return 1;
      if (CheckNumber(_num2, number) == true) return 2;
      if (CheckNumber(_num3, number) == true) return 3;
      if (CheckNumber(_num4, number) == true) return 4;
      if (CheckNumber(_num5, number) == true) return 5;
      if (CheckNumber(_num6, number) == true) return 6;
      if (CheckNumber(_num7, number) == true) return 7;
      if (CheckNumber(_num8, number) == true) return 8;
      if (CheckNumber(_num9, number) == true) return 9;
      return 6;
    }
    static private bool CheckNumber(int[,] dic, int[,] number)
    {
      //逐個匹配
      for (int i = 0; i < 7; i++)
      {
        for (int j = 0; j < 10; j++)
        {
          if (dic[i, j] == 1 && number[i, j] != 1)
          {
            return false;
          }
        }
      }
      return true;
    }
    static public string getNumber(Bitmap bmp)
    {
      //調用
      string str = "";
      for (int i = 0; i <= 3; i++)
      {
        int[,] number = getNum(bmp, i);
        int m = CheckNumber(number);
        str += m.ToString();
      }
      return str;
    }
  }
}

用以下代碼調用就可以看到輸出結果為9637了,這個識別代碼沒有用到任何高級算法,所以也只能識別初級的驗證碼,但是對特征庫擴展之後也可以識別出規范的字母。

System.Net.WebClient wb = new System.Net.WebClient();
      byte[] b=wb.DownloadData("http://p.blog.csdn.net/images/p_blog_csdn_net/jinjazz/355056/o_rrr.bmp");
      System.IO.MemoryStream ms=new System.IO.MemoryStream(b);
      System.Drawing.Bitmap bmp = new Bitmap(ms);
      string str = BmpNumber.Number.getNumber(bmp);
      Console.WriteLine(str);
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