C#驗證碼識別類完整實例
更新時間：2015年07月22日 10:28:17 作者：冰封的心
這篇文章主要介紹了C#驗證碼識別類,以一個完整實例形式較為詳細(xì)的分析了驗證碼圖片處理所涉及的各種常用技巧,具有一定參考借鑒價值,需要的朋友可以參考下
本文實例講述了C#驗證碼識別類。分享給大家供大家參考。具體實現(xiàn)方法如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
namespace 驗證碼處理
{
class VerifyCode
{
public Bitmap bmpobj;
public VerifyCode(Bitmap pic)
{
bmpobj = new Bitmap(pic); //轉(zhuǎn)換為Format32bppRgb
}
/// <summary>
/// 根據(jù)RGB，計算灰度值
/// </summary>
/// <param name="posClr">Color值</param>
/// <returns>灰度值，整型</returns>
private int GetGrayNumColor(System.Drawing.Color posClr)
{
return (posClr.R * 19595 + posClr.G * 38469 + posClr.B * 7472) >> 16;
}
/// <summary>
/// 灰度轉(zhuǎn)換,逐點方式
/// </summary>
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));
}
}
}
/// <summary>
/// 去圖形邊框
/// </summary>
/// <param name="borderWidth"></param>
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));
}
}
}
/// <summary>
/// 灰度轉(zhuǎn)換,逐行方式
/// </summary>
public void GrayByLine()
{
Rectangle rec = new Rectangle(0, 0, bmpobj.Width, bmpobj.Height);
BitmapData bmpData = bmpobj.LockBits(rec, ImageLockMode.ReadWrite, bmpobj.PixelFormat);// PixelFormat.Format32bppPArgb);
// 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);
//對圖片進(jìn)行處理
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轉(zhuǎn)byte
}
bmpobj.UnlockBits(bmpData);
////輸出
//GCHandle gch = GCHandle.Alloc(pixels, GCHandleType.Pinned);
//bmpOutput = new Bitmap(bmpobj.Width, bmpobj.Height, bmpData.Stride, bmpData.PixelFormat, gch.AddrOfPinnedObject());
//gch.Free();
}
/// <summary>
/// 得到有效圖形并調(diào)整為可平均分割的大小
/// </summary>
/// <param name="dgGrayValue">灰度背景分界值</param>
/// <param name="CharsCount">有效字符數(shù)</param>
/// <returns></returns>
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++) //找有效區(qū)
{
for (int j = 0; j < bmpobj.Width; j++)
{
int pixelValue = bmpobj.GetPixel(j, i).R;
if (pixelValue < dgGrayValue) //根據(jù)灰度值
{
if (posx1 > j) posx1 = j;
if (posy1 > i) posy1 = i;
if (posx2 < j) posx2 = j;
if (posy2 < i) posy2 = i;
};
};
};
// 確保能整除
int Span = CharsCount - (posx2 - posx1 + 1) % CharsCount; //可整除的差額數(shù)
if (Span < CharsCount)
{
int leftSpan = Span / 2; //分配到左邊的空列 ，如span為單數(shù),則右邊比左邊大1
if (posx1 > leftSpan)
posx1 = posx1 - leftSpan;
if (posx2 + Span - leftSpan < bmpobj.Width)
posx2 = posx2 + Span - leftSpan;
}
//復(fù)制新圖
Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);
bmpobj = bmpobj.Clone(cloneRect, bmpobj.PixelFormat);
}
/// <summary>
/// 得到有效圖形,圖形為類變量
/// </summary>
/// <param name="dgGrayValue">灰度背景分界值</param>
/// <param name="CharsCount">有效字符數(shù)</param>
/// <returns></returns>
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++) //找有效區(qū)
{
for (int j = 0; j < bmpobj.Width; j++)
{
int pixelValue = bmpobj.GetPixel(j, i).R;
if (pixelValue < dgGrayValue) //根據(jù)灰度值
{
if (posx1 > j) posx1 = j;
if (posy1 > i) posy1 = i;
if (posx2 < j) posx2 = j;
if (posy2 < i) posy2 = i;
};
};
};
//復(fù)制新圖
Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);
bmpobj = bmpobj.Clone(cloneRect, bmpobj.PixelFormat);
}
/// <summary>
/// 得到有效圖形,圖形由外面?zhèn)魅?
/// </summary>
/// <param name="dgGrayValue">灰度背景分界值</param>
/// <param name="CharsCount">有效字符數(shù)</param>
/// <returns></returns>
public Bitmap GetPicValidByValue(Bitmap singlepic, int dgGrayValue)
{
int posx1 = singlepic.Width; int posy1 = singlepic.Height;
int posx2 = 0; int posy2 = 0;
for (int i = 0; i < singlepic.Height; i++) //找有效區(qū)
{
for (int j = 0; j < singlepic.Width; j++)
{
int pixelValue = singlepic.GetPixel(j, i).R;
if (pixelValue < dgGrayValue) //根據(jù)灰度值
{
if (posx1 > j) posx1 = j;
if (posy1 > i) posy1 = i;
if (posx2 < j) posx2 = j;
if (posy2 < i) posy2 = i;
};
};
};
//復(fù)制新圖
Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);
return singlepic.Clone(cloneRect, singlepic.PixelFormat);
}
/// <summary>
/// 平均分割圖片
/// </summary>
/// <param name="RowNum">水平上分割數(shù)</param>
/// <param name="ColNum">垂直上分割數(shù)</param>
/// <returns>分割好的圖片數(shù)組</returns>
public Bitmap [] GetSplitPics(int RowNum,int ColNum)
{
if (RowNum == 0 || ColNum == 0)
return null;
int singW = bmpobj.Width / RowNum;
int singH = bmpobj.Height / ColNum;
Bitmap [] PicArray=new Bitmap[RowNum*ColNum];
Rectangle cloneRect;
for (int i = 0; i < ColNum; i++) //找有效區(qū)
{
for (int j = 0; j < RowNum; j++)
{
cloneRect = new Rectangle(j*singW, i*singH, singW , singH);
PicArray[i*RowNum+j]=bmpobj.Clone(cloneRect, bmpobj.PixelFormat);//復(fù)制小塊圖
}
}
return PicArray;
}
/// <summary>
/// 返回灰度圖片的點陣描述字串，1表示灰點，0表示背景
/// </summary>
/// <param name="singlepic">灰度圖</param>
/// <param name="dgGrayValue">背前景灰色界限</param>
/// <returns></returns>
public string GetSingleBmpCode(Bitmap singlepic, int dgGrayValue)
{
Color piexl;
string code = "";
for (int posy = 0; posy < singlepic.Height; posy++)
for (int posx = 0; posx < singlepic.Width; posx++)
{
piexl = singlepic.GetPixel(posx, posy);
if (piexl.R < dgGrayValue) // Color.Black )
code = code + "1";
else
code = code + "0";
}
return code;
}
/// <summary>
/// 得到灰度圖像前景背景的臨界值 最大類間方差法
/// </summary>
/// <returns>前景背景的臨界值</returns>
public int GetDgGrayValue()
{
int[] pixelNum = new int[256]; //圖象直方圖，共256個點
int n, n1, n2;
int total; //total為總和，累計值
double m1, m2, sum, csum, fmax, sb; //sb為類間方差，fmax存儲最大方差值
int k, t, q;
int threshValue = 1; // 閾值
//生成直方圖
for (int i = 0; i < bmpobj.Width; i++)
{
for (int j = 0; j < bmpobj.Height; j++)
{
//返回各個點的顏色，以RGB表示
pixelNum[bmpobj.GetPixel(i, j).R]++; //相應(yīng)的直方圖加1
}
}
//直方圖平滑化
for (k = 0; k <= 255; k++)
{
total = 0;
for (t = -2; t <= 2; t++) //與附近2個灰度做平滑化，t值應(yīng)取較小的值
{
q = k + t;
if (q < 0) //越界處理
q = 0;
if (q > 255)
q = 255;
total = total + pixelNum[q]; //total為總和，累計值
}
pixelNum[k] = (int)((float)total / 5.0 + 0.5); //平滑化，左邊2個+中間1個+右邊2個灰度，共5個，所以總和除以5，后面加0.5是用修正值
}
//求閾值
sum = csum = 0.0;
n = 0;
//計算總的圖象的點數(shù)和質(zhì)量矩，為后面的計算做準(zhǔn)備
for (k = 0; k <= 255; k++)
{
sum += (double)k * (double)pixelNum[k]; //x*f(x)質(zhì)量矩，也就是每個灰度的值乘以其點數(shù)（歸一化后為概率），sum為其總和
n += pixelNum[k]; //n為圖象總的點數(shù)，歸一化后就是累積概率
}
fmax = -1.0; //類間方差sb不可能為負(fù)，所以fmax初始值為-1不影響計算的進(jìn)行
n1 = 0;
for (k = 0; k < 256; k++) //對每個灰度（從0到255）計算一次分割后的類間方差sb
{
n1 += pixelNum[k]; //n1為在當(dāng)前閾值遍前景圖象的點數(shù)
if (n1 == 0) { continue; } //沒有分出前景后景
n2 = n - n1; //n2為背景圖象的點數(shù)
if (n2 == 0) { break; } //n2為0表示全部都是后景圖象，與n1=0情況類似，之后的遍歷不可能使前景點數(shù)增加，所以此時可以退出循環(huán)
csum += (double)k * pixelNum[k]; //前景的“灰度的值*其點數(shù)”的總和
m1 = csum / n1; //m1為前景的平均灰度
m2 = (sum - csum) / n2; //m2為背景的平均灰度
sb = (double)n1 * (double)n2 * (m1 - m2) * (m1 - m2); //sb為類間方差
if (sb > fmax) //如果算出的類間方差大于前一次算出的類間方差
{
fmax = sb; //fmax始終為最大類間方差（otsu）
threshValue = k; //取最大類間方差時對應(yīng)的灰度的k就是最佳閾值
}
}
return threshValue;
}
/// <summary>
/// 去掉雜點（適合雜點/雜線粗為1）
/// </summary>
/// <param name="dgGrayValue">背前景灰色界限</param>
/// <returns></returns>
public void ClearNoise(int dgGrayValue, int MaxNearPoints)
{
Color piexl;
int nearDots = 0;
//逐點判斷
for (int i = 0; i < bmpobj.Width; i++)
for (int j = 0; j < bmpobj.Height; j++)
{
piexl = bmpobj.GetPixel(i, j);
if (piexl.R < dgGrayValue)
{
nearDots = 0;
//判斷周圍8個點是否全為空
if (i == 0 || i == bmpobj.Width - 1 || j == 0 || j == bmpobj.Height - 1) //邊框全去掉
{
bmpobj.SetPixel(i, j, Color.FromArgb(255, 255, 255));
}
else
{
if (bmpobj.GetPixel(i - 1, j - 1).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i, j - 1).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i + 1, j - 1).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i - 1, j).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i + 1, j).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i - 1, j + 1).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i, j + 1).R < dgGrayValue) nearDots++;
if (bmpobj.GetPixel(i + 1, j + 1).R < dgGrayValue) nearDots++;
}
if (nearDots < MaxNearPoints)
bmpobj.SetPixel(i, j, Color.FromArgb(255, 255, 255)); //去掉單點 && 粗細(xì)小3鄰邊點
}
else //背景
bmpobj.SetPixel(i, j, Color.FromArgb(255, 255, 255));
}
}
/// <summary>
/// 3×3中值濾波除雜
/// </summary>
/// <param name="dgGrayValue"></param>
public void ClearNoise(int dgGrayValue)
{
int x, y;
byte[] p = new byte[9]; //最小處理窗口3*3
byte s;
//byte[] lpTemp=new BYTE[nByteWidth*nHeight];
int i, j;
//--!!!!!!!!!!!!!!下面開始窗口為3×3中值濾波!!!!!!!!!!!!!!!!
for (y = 1; y < bmpobj.Height - 1; y++) //--第一行和最后一行無法取窗口
{
for (x = 1; x < bmpobj.Width - 1; x++)
{
//取9個點的值
p[0] = bmpobj.GetPixel(x - 1, y - 1).R;
p[1] = bmpobj.GetPixel(x, y - 1).R;
p[2] = bmpobj.GetPixel(x + 1, y - 1).R;
p[3] = bmpobj.GetPixel(x - 1, y).R;
p[4] = bmpobj.GetPixel(x, y).R;
p[5] = bmpobj.GetPixel(x + 1, y).R;
p[6] = bmpobj.GetPixel(x - 1, y + 1).R;
p[7] = bmpobj.GetPixel(x, y + 1).R;
p[8] = bmpobj.GetPixel(x + 1, y + 1).R;
//計算中值
for (j = 0; j < 5; j++)
{
for (i = j + 1; i < 9; i++)
{
if (p[j] > p[i])
{
s = p[j];
p[j] = p[i];
p[i] = s;
}
}
}
// if (bmpobj.GetPixel(x, y).R < dgGrayValue)
bmpobj.SetPixel(x, y, Color.FromArgb(p[4], p[4], p[4])); //給有效值付中值
}
}
}
/// <summary>
/// 該函數(shù)用于對圖像進(jìn)行腐蝕運算。結(jié)構(gòu)元素為水平方向或垂直方向的三個點，
/// 中間點位于原點；或者由用戶自己定義3×3的結(jié)構(gòu)元素。
/// </summary>
/// <param name="dgGrayValue">前后景臨界值</param>
/// <param name="nMode">腐蝕方式：0表示水平方向，1垂直方向，2自定義結(jié)構(gòu)元素。</param>
/// <param name="structure"> 自定義的3×3結(jié)構(gòu)元素</param>
public void ErosionPic(int dgGrayValue, int nMode, bool[,] structure)
{
int lWidth = bmpobj.Width;
int lHeight = bmpobj.Height;
Bitmap newBmp = new Bitmap(lWidth, lHeight);
int i, j, n, m; //循環(huán)變量
if (nMode == 0)
{
//使用水平方向的結(jié)構(gòu)元素進(jìn)行腐蝕
// 由于使用1×3的結(jié)構(gòu)元素，為防止越界，所以不處理最左邊和最右邊
// 的兩列像素
for (j = 0; j < lHeight; j++)
{
for (i = 1; i < lWidth - 1; i++)
{
//目標(biāo)圖像中的當(dāng)前點先賦成黑色
newBmp.SetPixel(i, j, Color.Black);
//如果源圖像中當(dāng)前點自身或者左右有一個點不是黑色，
//則將目標(biāo)圖像中的當(dāng)前點賦成白色
if (bmpobj.GetPixel(i - 1, j).R > dgGrayValue ||
bmpobj.GetPixel(i, j).R > dgGrayValue ||
bmpobj.GetPixel(i + 1, j).R > dgGrayValue)
newBmp.SetPixel(i, j, Color.White);
}
}
}
else if (nMode == 1)
{
//使用垂真方向的結(jié)構(gòu)元素進(jìn)行腐蝕
// 由于使用3×1的結(jié)構(gòu)元素，為防止越界，所以不處理最上邊和最下邊
// 的兩行像素
for (j = 1; j < lHeight - 1; j++)
{
for (i = 0; i < lWidth; i++)
{
//目標(biāo)圖像中的當(dāng)前點先賦成黑色
newBmp.SetPixel(i, j, Color.Black);
//如果源圖像中當(dāng)前點自身或者左右有一個點不是黑色，
//則將目標(biāo)圖像中的當(dāng)前點賦成白色
if (bmpobj.GetPixel(i, j - 1).R > dgGrayValue ||
bmpobj.GetPixel(i, j).R > dgGrayValue ||
bmpobj.GetPixel(i, j + 1).R > dgGrayValue)
newBmp.SetPixel(i, j, Color.White);
}
}
}
else
{
if (structure.Length != 9) //檢查自定義結(jié)構(gòu)
return;
//使用自定義的結(jié)構(gòu)元素進(jìn)行腐蝕
// 由于使用3×3的結(jié)構(gòu)元素，為防止越界，所以不處理最左邊和最右邊
// 的兩列像素和最上邊和最下邊的兩列像素
for (j = 1; j < lHeight - 1; j++)
{
for (i = 1; i < lWidth - 1; i++)
{
//目標(biāo)圖像中的當(dāng)前點先賦成黑色
newBmp.SetPixel(i, j, Color.Black);
//如果原圖像中對應(yīng)結(jié)構(gòu)元素中為黑色的那些點中有一個不是黑色，
//則將目標(biāo)圖像中的當(dāng)前點賦成白色
for (m = 0; m < 3; m++)
{
for (n = 0; n < 3; n++)
{
if (!structure[m, n])
continue;
if (bmpobj.GetPixel(i + m - 1, j + n - 1).R > dgGrayValue)
{
newBmp.SetPixel(i, j, Color.White);
break;
}
}
}
}
}
}
bmpobj = newBmp;
}
/// <summary>
/// 該函數(shù)用于對圖像進(jìn)行細(xì)化運算。要求目標(biāo)圖像為灰度圖像
/// </summary>
/// <param name="dgGrayValue"></param>
public void ThiningPic(int dgGrayValue)
{
int lWidth = bmpobj.Width;
int lHeight = bmpobj.Height;
// Bitmap newBmp = new Bitmap(lWidth, lHeight);
bool bModified; //臟標(biāo)記
int i, j, n, m; //循環(huán)變量
//四個條件
bool bCondition1;
bool bCondition2;
bool bCondition3;
bool bCondition4;
int nCount; //計數(shù)器
int[,] neighbour = new int[5, 5]; //5×5相鄰區(qū)域像素值
bModified = true;
while (bModified)
{
bModified = false;
//由于使用5×5的結(jié)構(gòu)元素，為防止越界，所以不處理外圍的幾行和幾列像素
for (j = 2; j < lHeight - 2; j++)
{
for (i = 2; i < lWidth - 2; i++)
{
bCondition1 = false;
bCondition2 = false;
bCondition3 = false;
bCondition4 = false;
if (bmpobj.GetPixel(i, j).R > dgGrayValue)
{
if (bmpobj.GetPixel(i, j).R < 255)
bmpobj.SetPixel(i, j, Color.White);
continue;
}
//獲得當(dāng)前點相鄰的5×5區(qū)域內(nèi)像素值，白色用0代表，黑色用1代表
for (m = 0; m < 5; m++)
{
for (n = 0; n < 5; n++)
{
neighbour[m, n] = bmpobj.GetPixel(i + m - 2, j + n - 2).R < dgGrayValue ? 1 : 0;
}
}
//逐個判斷條件。
//判斷2<=NZ(P1)<=6
nCount = neighbour[1, 1] + neighbour[1, 2] + neighbour[1, 3]
+ neighbour[2, 1] + neighbour[2, 3] +
+neighbour[3, 1] + neighbour[3, 2] + neighbour[3, 3];
if (nCount >= 2 && nCount <= 6)
{
bCondition1 = true;
}
//判斷Z0(P1)=1
nCount = 0;
if (neighbour[1, 2] == 0 && neighbour[1, 1] == 1)
nCount++;
if (neighbour[1, 1] == 0 && neighbour[2, 1] == 1)
nCount++;
if (neighbour[2, 1] == 0 && neighbour[3, 1] == 1)
nCount++;
if (neighbour[3, 1] == 0 && neighbour[3, 2] == 1)
nCount++;
if (neighbour[3, 2] == 0 && neighbour[3, 3] == 1)
nCount++;
if (neighbour[3, 3] == 0 && neighbour[2, 3] == 1)
nCount++;
if (neighbour[2, 3] == 0 && neighbour[1, 3] == 1)
nCount++;
if (neighbour[1, 3] == 0 && neighbour[1, 2] == 1)
nCount++;
if (nCount == 1)
bCondition2 = true;
//判斷P2*P4*P8=0 or Z0(p2)!=1
if (neighbour[1, 2] * neighbour[2, 1] * neighbour[2, 3] == 0)
{
bCondition3 = true;
}
else
{
nCount = 0;
if (neighbour[0, 2] == 0 && neighbour[0, 1] == 1)
nCount++;
if (neighbour[0, 1] == 0 && neighbour[1, 1] == 1)
nCount++;
if (neighbour[1, 1] == 0 && neighbour[2, 1] == 1)
nCount++;
if (neighbour[2, 1] == 0 && neighbour[2, 2] == 1)
nCount++;
if (neighbour[2, 2] == 0 && neighbour[2, 3] == 1)
nCount++;
if (neighbour[2, 3] == 0 && neighbour[1, 3] == 1)
nCount++;
if (neighbour[1, 3] == 0 && neighbour[0, 3] == 1)
nCount++;
if (neighbour[0, 3] == 0 && neighbour[0, 2] == 1)
nCount++;
if (nCount != 1)
bCondition3 = true;
}
//判斷P2*P4*P6=0 or Z0(p4)!=1
if (neighbour[1, 2] * neighbour[2, 1] * neighbour[3, 2] == 0)
{
bCondition4 = true;
}
else
{
nCount = 0;
if (neighbour[1, 1] == 0 && neighbour[1, 0] == 1)
nCount++;
if (neighbour[1, 0] == 0 && neighbour[2, 0] == 1)
nCount++;
if (neighbour[2, 0] == 0 && neighbour[3, 0] == 1)
nCount++;
if (neighbour[3, 0] == 0 && neighbour[3, 1] == 1)
nCount++;
if (neighbour[3, 1] == 0 && neighbour[3, 2] == 1)
nCount++;
if (neighbour[3, 2] == 0 && neighbour[2, 2] == 1)
nCount++;
if (neighbour[2, 2] == 0 && neighbour[1, 2] == 1)
nCount++;
if (neighbour[1, 2] == 0 && neighbour[1, 1] == 1)
nCount++;
if (nCount != 1)
bCondition4 = true;
}
if (bCondition1 && bCondition2 && bCondition3 && bCondition4)
{
bmpobj.SetPixel(i, j, Color.White);
bModified = true;
}
else
{
bmpobj.SetPixel(i, j, Color.Black);
}
}
}
}
// 復(fù)制細(xì)化后的圖像
// bmpobj = newBmp;
}
/// <summary>
/// 銳化要啟用不安全代碼編譯
/// </summary>
/// <param name="val">銳化程度。取值[0,1]。值越大銳化程度越高</param>
/// <returns>銳化后的圖像</returns>
public void Sharpen(float val)
{
int w = bmpobj.Width;
int h = bmpobj.Height;
Bitmap bmpRtn = new Bitmap(w, h, PixelFormat.Format24bppRgb);
BitmapData srcData = bmpobj.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
BitmapData dstData = bmpRtn.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
unsafe
{
byte* pIn = (byte*)srcData.Scan0.ToPointer();
byte* pOut = (byte*)dstData.Scan0.ToPointer();
int stride = srcData.Stride;
byte* p;
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
//取周圍9點的值。位于邊緣上的點不做改變。
if (x == 0 || x == w - 1 || y == 0 || y == h - 1)
{
//不做
pOut[0] = pIn[0];
pOut[1] = pIn[1];
pOut[2] = pIn[2];
}
else
{
int r1, r2, r3, r4, r5, r6, r7, r8, r0;
int g1, g2, g3, g4, g5, g6, g7, g8, g0;
int b1, b2, b3, b4, b5, b6, b7, b8, b0;
float vR, vG, vB;
//左上
p = pIn - stride - 3;
r1 = p[2];
g1 = p[1];
b1 = p[0];
//正上
p = pIn - stride;
r2 = p[2];
g2 = p[1];
b2 = p[0];
//右上
p = pIn - stride + 3;
r3 = p[2];
g3 = p[1];
b3 = p[0];
//左側(cè)
p = pIn - 3;
r4 = p[2];
g4 = p[1];
b4 = p[0];
//右側(cè)
p = pIn + 3;
r5 = p[2];
g5 = p[1];
b5 = p[0];
//右下
p = pIn + stride - 3;
r6 = p[2];
g6 = p[1];
b6 = p[0];
//正下
p = pIn + stride;
r7 = p[2];
g7 = p[1];
b7 = p[0];
//右下
p = pIn + stride + 3;
r8 = p[2];
g8 = p[1];
b8 = p[0];
//自己
p = pIn;
r0 = p[2];
g0 = p[1];
b0 = p[0];
vR = (float)r0 - (float)(r1 + r2 + r3 + r4 + r5 + r6 + r7 + r8) / 8;
vG = (float)g0 - (float)(g1 + g2 + g3 + g4 + g5 + g6 + g7 + g8) / 8;
vB = (float)b0 - (float)(b1 + b2 + b3 + b4 + b5 + b6 + b7 + b8) / 8;
vR = r0 + vR * val;
vG = g0 + vG * val;
vB = b0 + vB * val;
if (vR > 0)
{
vR = Math.Min(255, vR);
}
else
{
vR = Math.Max(0, vR);
}
if (vG > 0)
{
vG = Math.Min(255, vG);
}
else
{
vG = Math.Max(0, vG);
}
if (vB > 0)
{
vB = Math.Min(255, vB);
}
else
{
vB = Math.Max(0, vB);
}
pOut[0] = (byte)vB;
pOut[1] = (byte)vG;
pOut[2] = (byte)vR;
}
pIn += 3;
pOut += 3;
}// end of x
pIn += srcData.Stride - w * 3;
pOut += srcData.Stride - w * 3;
} // end of y
}
bmpobj.UnlockBits(srcData);
bmpRtn.UnlockBits(dstData);
bmpobj = bmpRtn;
}
/// <summary>
/// 圖片二值化
/// </summary>
/// <param name="hsb"></param>
public void BitmapTo1Bpp(Double hsb)
{
int w = bmpobj.Width;
int h = bmpobj.Height;
Bitmap bmp = new Bitmap(w, h, PixelFormat.Format1bppIndexed);
BitmapData data = bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format1bppIndexed);
for (int y = 0; y < h; y++)
{
byte[] scan = new byte[(w + 7) / 8];
for (int x = 0; x < w; x++)
{
Color c = bmpobj.GetPixel(x, y);
if (c.GetBrightness() >= hsb) scan[x / 8] |= (byte)(0x80 >> (x % 8));
}
Marshal.Copy(scan, 0, (IntPtr)((int)data.Scan0 + data.Stride * y), scan.Length);
}
bmp.UnlockBits(data);
bmpobj = bmp;
}
}
}
希望本文所述對大家的C#程序設(shè)計有所幫助。
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