一個驗證碼識別的代碼

字型固定，位置固定，幹擾點和字型色彩深度沒有交叉，比如下面的範例，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，確定特徵碼-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    {        //數字特徵庫       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進階演算法，所以也只能識別初級的驗證碼，但是對特徵庫擴充之後也可以識別出規範的字母。

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);