在网络上找的一篇关于验证码识别的类。代码如下。

using System;

using System.Collections.Generic;

using System.Text;

using System.Collections;

using System.Drawing;

using System.Drawing.Imaging;

using System.Runtime.InteropServices;

namespace BallotAiying2

{

class UnCodebase

{

public Bitmap bmpobj;

public UnCodebase(Bitmap pic)

{

bmpobj = new Bitmap(pic); //转换为净化工程Format32bppRgb

}

/**////

/// 根据RGB，计算灰度值

///

/// Color值

/// 灰度值，整型

private int GetGrayNumColor(System.Drawing.Color posClr)

{

return (posClr.R * 19595 + posClr.G * 38469 + posClr.B * 7472) >> 16;

}

/**////

/// 灰度转换,逐点方式

///

public void GrayByPixels()

{

for (int i = 0; i < bmpobj.Height; i++)

{

for (int j = 0; j < bmpobj.Width; j++)

{

int tmpValue = GetGrayNumColor(bmpobj.GetPixel(j, i));

bmpobj.SetPixel(j, i, Color.FromArgb(tmpValue, tmpValue, tmpValue));

}

/**////

/// 去图形边框

///

public void ClearPicBorder(int borderWidth)

{

for (int i = 0; i < bmpobj.Height; i++)

{

for (int j = 0; j < bmpobj.Width; j++)

{

if (i < borderWidth || j < borderWidth || j > bmpobj.Width - 1 - borderWidth || i > bmpobj.Height - 1 - borderWidth)

bmpobj.SetPixel(j, i, Color.FromArgb(255, 255, 255));

}

/**////

/// 灰度转换,逐行方式

///

public void GrayByLine()

{

Rectangle rec = new Rectangle(0, 0, bmpobj.Width, bmpobj.Height);

BitmapData bmpData = bmpobj.LockBits(rec, ImageLockMode.ReadWrite, bmpobj.PixelFormat);// PixelFormat.Format32bppPArgb);

// 净化设备bmpData.PixelFormat = PixelFormat.Format24bppRgb;

IntPtr scan0 = bmpData.Scan0;

int len = bmpobj.Width * bmpobj.Height;

int[] pixels = new int[len];

Marshal.Copy(scan0, pixels, 0, len);

//对图片进行处理

int GrayValue = 0;

for (int i = 0; i < len; i++)

{

GrayValue = GetGrayNumColor(Color.FromArgb(pixels[i]));

pixels[i] = (byte)(Color.FromArgb(GrayValue, GrayValue, GrayValue)).ToArgb(); //Color转byte

}

bmpobj.UnlockBits(bmpData);

}

/**////

/// 得到有效图形并调整为可平均分割的大小

///

/// 灰度背景分界值

/// 有效字符数

///

public void GetPicValidByValue(int dgGrayValue, int CharsCount)

{

int posx1 = bmpobj.Width; int posy1 = bmpobj.Height;

int posx2 = 0; int posy2 = 0;

for (int i = 0; i < bmpobj.Height; i++) //找有效区

{

for (int j = 0; j < bmpobj.Width; j++)

{

int pixelValue = bmpobj.GetPixel(j, i).R;

if (pixelValue < dgGrayValue) //根据灰度值

{

if (posx1 > j) posx1 = j;

if (posy1 > i) posy1 = i;

if (posx2 < j) posx2 = j;

if (posy2 < i) posy2 = i;

};

// 确保能整除

int Span = CharsCount - (posx2 - posx1 + 1) % CharsCount; //可整除的差额数

if (Span < CharsCount)

{

int leftSpan = Span / 2; //分配到左边的空列，如span为单数,则右边比左边大1

if (posx1 > leftSpan)

posx1 = posx1 - leftSpan;

if (posx2 + Span - leftSpan < bmpobj.Width)

posx2 = posx2 + Span - leftSpan;

}

//复制新图

Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);

bmpobj = bmpobj.Clone(cloneRect, bmpobj.PixelFormat);

}

/**////

/// 得到有效图形,图形为类变量

///

/// 灰度背景分界值

/// 有效字符数

///

public void GetPicValidByValue(int dgGrayValue)

{

int posx1 = bmpobj.Width; int posy1 = bmpobj.Height;

int posx2 = 0; int posy2 = 0;

for (int i = 0; i < bmpobj.Height; i++) //找有效区

{

for (int j = 0; j < bmpobj.Width; j++)

{

int pixelValue = bmpobj.GetPixel(j, i).R;

if (pixelValue < dgGrayValue) //根据灰度值

{

if

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C#验证码识别类

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