C# 验证识别基类

原文 C# 验证识别基类

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网上找了些代码  自己又改了下
先放出来了  处理简单的验证码足够了
001
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Runtime.InteropServices;
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namespace 验证码处理
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{
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    class VerifyCode
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    {
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        public Bitmap bmpobj;
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        public VerifyCode(Bitmap pic)
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        {
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            bmpobj = new Bitmap(pic);    //转换为Format32bppRgb
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        }
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        /// <summary>
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        /// 根据RGB,计算灰度值
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        /// </summary>
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        /// <param name="posClr">Color值</param>
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        /// <returns>灰度值,整型</returns>
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        private int GetGrayNumColor(System.Drawing.Color posClr)
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        {
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            return (posClr.R * 19595 + posClr.G * 38469 + posClr.B * 7472) >> 16;
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        }
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        /// <summary>
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        /// 灰度转换,逐点方式
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        /// </summary>
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        public void GrayByPixels()
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        {
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            for (int i = 0; i < bmpobj.Height; i++)
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            {
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                for (int j = 0; j < bmpobj.Width; j++)
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                {
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                    int tmpValue = GetGrayNumColor(bmpobj.GetPixel(j, i));
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                    bmpobj.SetPixel(j, i, Color.FromArgb(tmpValue, tmpValue, tmpValue));
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                }
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            }
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        }
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        /// <summary>
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        /// 去图形边框
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        /// </summary>
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        /// <param name="borderWidth"></param>
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        public void ClearPicBorder(int borderWidth)
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        {
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            for (int i = 0; i < bmpobj.Height; i++)
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            {
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                for (int j = 0; j < bmpobj.Width; j++)
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                {
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                    if (i < borderWidth || j < borderWidth || j > bmpobj.Width - 1 - borderWidth || i > bmpobj.Height - 1 - borderWidth)
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                        bmpobj.SetPixel(j, i, Color.FromArgb(255, 255, 255));
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                }
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            }
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        }
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        /// <summary>
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        /// 灰度转换,逐行方式
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        /// </summary>
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        public void GrayByLine()
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        {
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            Rectangle rec = new Rectangle(0, 0, bmpobj.Width, bmpobj.Height);
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            BitmapData bmpData = bmpobj.LockBits(rec, ImageLockMode.ReadWrite, bmpobj.PixelFormat);// PixelFormat.Format32bppPArgb);
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            //    bmpData.PixelFormat = PixelFormat.Format24bppRgb;
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            IntPtr scan0 = bmpData.Scan0;
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            int len = bmpobj.Width * bmpobj.Height;
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            int[] pixels = new int[len];
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            Marshal.Copy(scan0, pixels, 0, len);
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            //对图片进行处理
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            int GrayValue = 0;
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            for (int i = 0; i < len; i++)
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            {
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                GrayValue = GetGrayNumColor(Color.FromArgb(pixels[i]));
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                pixels[i] = (byte)(Color.FromArgb(GrayValue, GrayValue, GrayValue)).ToArgb();      //Color转byte
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            }
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            bmpobj.UnlockBits(bmpData);
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            ////输出
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            //GCHandle gch = GCHandle.Alloc(pixels, GCHandleType.Pinned);
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            //bmpOutput = new Bitmap(bmpobj.Width, bmpobj.Height, bmpData.Stride, bmpData.PixelFormat, gch.AddrOfPinnedObject());
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            //gch.Free();
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        }
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        /// <summary>
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        /// 得到有效图形并调整为可平均分割的大小
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        /// </summary>
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        /// <param name="dgGrayValue">灰度背景分界值</param>
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        /// <param name="CharsCount">有效字符数</param>
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        /// <returns></returns>
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        public void GetPicValidByValue(int dgGrayValue, int CharsCount)
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        {
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            int posx1 = bmpobj.Width; int posy1 = bmpobj.Height;
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            int posx2 = 0; int posy2 = 0;
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            for (int i = 0; i < bmpobj.Height; i++)      //找有效区
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            {
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                for (int j = 0; j < bmpobj.Width; j++)
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                {
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                    int pixelValue = bmpobj.GetPixel(j, i).R;
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                    if (pixelValue < dgGrayValue)     //根据灰度值
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                    {
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                        if (posx1 > j) posx1 = j;
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                        if (posy1 > i) posy1 = i;
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                        if (posx2 < j) posx2 = j;
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                        if (posy2 < i) posy2 = i;
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                    };
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                };
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            };
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            // 确保能整除
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            int Span = CharsCount - (posx2 - posx1 + 1) % CharsCount;   //可整除的差额数
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            if (Span < CharsCount)
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            {
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                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
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                if (posx1 > leftSpan)
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                    posx1 = posx1 - leftSpan;
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                if (posx2 + Span - leftSpan < bmpobj.Width)
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                    posx2 = posx2 + Span - leftSpan;
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            }
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            //复制新图
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            Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);
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            bmpobj = bmpobj.Clone(cloneRect, bmpobj.PixelFormat);
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        }
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        /// <summary>
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        /// 得到有效图形,图形为类变量
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        /// </summary>
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        /// <param name="dgGrayValue">灰度背景分界值</param>
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        /// <param name="CharsCount">有效字符数</param>
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        /// <returns></returns>
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        public void GetPicValidByValue(int dgGrayValue)
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        {
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            int posx1 = bmpobj.Width; int posy1 = bmpobj.Height;
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            int posx2 = 0; int posy2 = 0;
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            for (int i = 0; i < bmpobj.Height; i++)      //找有效区
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            {
142
                for (int j = 0; j < bmpobj.Width; j++)
143
                {
144
                    int pixelValue = bmpobj.GetPixel(j, i).R;
145
                    if (pixelValue < dgGrayValue)     //根据灰度值
146
                    {
147
                        if (posx1 > j) posx1 = j;
148
                        if (posy1 > i) posy1 = i;
149
  
150
                        if (posx2 < j) posx2 = j;
151
                        if (posy2 < i) posy2 = i;
152
                    };
153
                };
154
            };
155
            //复制新图
156
            Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);
157
            bmpobj = bmpobj.Clone(cloneRect, bmpobj.PixelFormat);
158
        }
159
  
160
        /// <summary>
161
        /// 得到有效图形,图形由外面传入
162
        /// </summary>
163
        /// <param name="dgGrayValue">灰度背景分界值</param>
164
        /// <param name="CharsCount">有效字符数</param>
165
        /// <returns></returns>
166
        public Bitmap GetPicValidByValue(Bitmap singlepic, int dgGrayValue)
167
        {
168
            int posx1 = singlepic.Width; int posy1 = singlepic.Height;
169
            int posx2 = 0; int posy2 = 0;
170
            for (int i = 0; i < singlepic.Height; i++)      //找有效区
171
            {
172
                for (int j = 0; j < singlepic.Width; j++)
173
                {
174
                    int pixelValue = singlepic.GetPixel(j, i).R;
175
                    if (pixelValue < dgGrayValue)     //根据灰度值
176
                    {
177
                        if (posx1 > j) posx1 = j;
178
                        if (posy1 > i) posy1 = i;
179
  
180
                        if (posx2 < j) posx2 = j;
181
                        if (posy2 < i) posy2 = i;
182
                    };
183
                };
184
            };
185
            //复制新图
186
            Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);
187
            return singlepic.Clone(cloneRect, singlepic.PixelFormat);
188
        }
189
          
190
        /// <summary>
191
        /// 平均分割图片
192
        /// </summary>
193
        /// <param name="RowNum">水平上分割数</param>
194
        /// <param name="ColNum">垂直上分割数</param>
195
        /// <returns>分割好的图片数组</returns>
196
        public Bitmap [] GetSplitPics(int RowNum,int ColNum)
197
        {
198
            if (RowNum == 0 || ColNum == 0)
199
                return null;
200
            int singW = bmpobj.Width / RowNum;
201
            int singH = bmpobj.Height / ColNum;
202
            Bitmap [] PicArray=new Bitmap[RowNum*ColNum];
203
  
204
            Rectangle cloneRect;
205
            for (int i = 0; i < ColNum; i++)      //找有效区
206
            {
207
                for (int j = 0; j < RowNum; j++)
208
                {
209
                    cloneRect = new Rectangle(j*singW, i*singH, singW , singH);
210
                    PicArray[i*RowNum+j]=bmpobj.Clone(cloneRect, bmpobj.PixelFormat);//复制小块图
211
                }
212
            }
213
            return PicArray;
214
        }
215
  
216
        /// <summary>
217
        /// 返回灰度图片的点阵描述字串,1表示灰点,0表示背景
218
        /// </summary>
219
        /// <param name="singlepic">灰度图</param>
220
        /// <param name="dgGrayValue">背前景灰色界限</param>
221
        /// <returns></returns>
222
        public string GetSingleBmpCode(Bitmap singlepic, int dgGrayValue)
223
        {
224
            Color piexl;
225
            string code = "";
226
            for (int posy = 0; posy < singlepic.Height; posy++)
227
                for (int posx = 0; posx < singlepic.Width; posx++)
228
                {
229
                    piexl = singlepic.GetPixel(posx, posy);
230
                    if (piexl.R < dgGrayValue)    // Color.Black )
231
                        code = code + "1";
232
                    else
233
                        code = code + "0";
234
                }
235
            return code;
236
        }
237
  
238
        /// <summary>
239
        /// 得到灰度图像前景背景的临界值 最大类间方差法
240
        /// </summary>
241
        /// <returns>前景背景的临界值</returns>
242
        public int GetDgGrayValue()
243
        {
244
            int[] pixelNum = new int[256];           //图象直方图,共256个点
245
            int n, n1, n2;
246
            int total;                              //total为总和,累计值
247
            double m1, m2, sum, csum, fmax, sb;     //sb为类间方差,fmax存储最大方差值
248
            int k, t, q;
249
            int threshValue = 1;                      // 阈值
250
            //生成直方图
251
            for (int i = 0; i < bmpobj.Width; i++)
252
            {
253
                for (int j = 0; j < bmpobj.Height; j++)
254
                {
255
                    //返回各个点的颜色,以RGB表示
256
                    pixelNum[bmpobj.GetPixel(i, j).R]++;            //相应的直方图加1
257
                }
258
            }
259
            //直方图平滑化
260
            for (k = 0; k <= 255; k++)
261
            {
262
                total = 0;
263
                for (t = -2; t <= 2; t++)              //与附近2个灰度做平滑化,t值应取较小的值
264
                {
265
                    q = k + t;
266
                    if (q < 0)                     //越界处理
267
                        q = 0;
268
                    if (q > 255)
269
                        q = 255;
270
                    total = total + pixelNum[q];    //total为总和,累计值
271
                }
272
                pixelNum[k] = (int)((float)total / 5.0 + 0.5);    //平滑化,左边2个+中间1个+右边2个灰度,共5个,所以总和除以5,后面加0.5是用修正值
273
            }
274
            //求阈值
275
            sum = csum = 0.0;
276
            n = 0;
277
            //计算总的图象的点数和质量矩,为后面的计算做准备
278
            for (k = 0; k <= 255; k++)
279
            {
280
                sum += (double)k * (double)pixelNum[k];     //x*f(x)质量矩,也就是每个灰度的值乘以其点数(归一化后为概率),sum为其总和
281
                n += pixelNum[k];                       //n为图象总的点数,归一化后就是累积概率
282
            }
283
  
284
            fmax = -1.0;                          //类间方差sb不可能为负,所以fmax初始值为-1不影响计算的进行
285
            n1 = 0;
286
            for (k = 0; k < 256; k++)                  //对每个灰度(从0到255)计算一次分割后的类间方差sb
287
            {
288
                n1 += pixelNum[k];                //n1为在当前阈值遍前景图象的点数
289
                if (n1 == 0) { continue; }            //没有分出前景后景
290
                n2 = n - n1;                        //n2为背景图象的点数
291
                if (n2 == 0) { break; }               //n2为0表示全部都是后景图象,与n1=0情况类似,之后的遍历不可能使前景点数增加,所以此时可以退出循环
292
                csum += (double)k * pixelNum[k];    //前景的“灰度的值*其点数”的总和
293
                m1 = csum / n1;                     //m1为前景的平均灰度
294
                m2 = (sum - csum) / n2;               //m2为背景的平均灰度
295
                sb = (double)n1 * (double)n2 * (m1 - m2) * (m1 - m2);   //sb为类间方差
296
                if (sb > fmax)                  //如果算出的类间方差大于前一次算出的类间方差
297
                {
298
                    fmax = sb;                    //fmax始终为最大类间方差(otsu)
299
                    threshValue = k;              //取最大类间方差时对应的灰度的k就是最佳阈值
300
                }
301
            }
302
            return threshValue;
303
        }
304
  
305
        /// <summary>
306
        ///  去掉杂点(适合杂点/杂线粗为1)
307
        /// </summary>
308
        /// <param name="dgGrayValue">背前景灰色界限</param>
309
        /// <returns></returns>
310
        public void ClearNoise(int dgGrayValue, int MaxNearPoints)
311
        {
312
            Color piexl;
313
            int nearDots = 0;
314
            //逐点判断
315
            for (int i = 0; i < bmpobj.Width; i++)
316
                for (int j = 0; j < bmpobj.Height; j++)
317
                {
318
                    piexl = bmpobj.GetPixel(i, j);
319
                    if (piexl.R < dgGrayValue)
320
                    {
321
                        nearDots = 0;
322
                        //判断周围8个点是否全为空
323
                        if (i == 0 || i == bmpobj.Width - 1 || j == 0 || j == bmpobj.Height - 1)  //边框全去掉
324
                        {
325
                            bmpobj.SetPixel(i, j, Color.FromArgb(255, 255, 255));
326
                        }
327
                        else
328
                        {
329
                            if (bmpobj.GetPixel(i - 1, j - 1).R < dgGrayValue) nearDots++;
330
                            if (bmpobj.GetPixel(i, j - 1).R < dgGrayValue) nearDots++;
331
                            if (bmpobj.GetPixel(i + 1, j - 1).R < dgGrayValue) nearDots++;
332
                            if (bmpobj.GetPixel(i - 1, j).R < dgGrayValue) nearDots++;
333
                            if (bmpobj.GetPixel(i + 1, j).R < dgGrayValue) nearDots++;
334
                            if (bmpobj.GetPixel(i - 1, j + 1).R < dgGrayValue) nearDots++;
335
                            if (bmpobj.GetPixel(i, j + 1).R < dgGrayValue) nearDots++;
336
                            if (bmpobj.GetPixel(i + 1, j + 1).R < dgGrayValue) nearDots++;
337
                        }
338
  
339
                        if (nearDots < MaxNearPoints)
340
                            bmpobj.SetPixel(i, j, Color.FromArgb(255, 255, 255));   //去掉单点 && 粗细小3邻边点
341
                    }
342
                    else  //背景
343
                        bmpobj.SetPixel(i, j, Color.FromArgb(255, 255, 255));
344
                }
345
        }
346
  
347
        /// <summary>
348
        /// 3×3中值滤波除杂
349
        /// </summary>
350
        /// <param name="dgGrayValue"></param>
351
        public void ClearNoise(int dgGrayValue)
352
        {
353
            int x, y;
354
            byte[] p = new byte[9]; //最小处理窗口3*3
355
            byte s;
356
            //byte[] lpTemp=new BYTE[nByteWidth*nHeight];
357
            int i, j;
358
            //--!!!!!!!!!!!!!!下面开始窗口为3×3中值滤波!!!!!!!!!!!!!!!!
359
            for (y = 1; y < bmpobj.Height - 1; y++) //--第一行和最后一行无法取窗口
360
            {
361
                for (x = 1; x < bmpobj.Width - 1; x++)
362
                {
363
                    //取9个点的值
364
                    p[0] = bmpobj.GetPixel(x - 1, y - 1).R;
365
                    p[1] = bmpobj.GetPixel(x, y - 1).R;
366
                    p[2] = bmpobj.GetPixel(x + 1, y - 1).R;
367
                    p[3] = bmpobj.GetPixel(x - 1, y).R;
368
                    p[4] = bmpobj.GetPixel(x, y).R;
369
                    p[5] = bmpobj.GetPixel(x + 1, y).R;
370
                    p[6] = bmpobj.GetPixel(x - 1, y + 1).R;
371
                    p[7] = bmpobj.GetPixel(x, y + 1).R;
372
                    p[8] = bmpobj.GetPixel(x + 1, y + 1).R;
373
                    //计算中值
374
                    for (j = 0; j < 5; j++)
375
                    {
376
                        for (i = j + 1; i < 9; i++)
377
                        {
378
                            if (p[j] > p[i])
379
                            {
380
                                s = p[j];
381
                                p[j] = p[i];
382
                                p[i] = s;
383
                            }
384
                        }
385
                    }
386
                    //      if (bmpobj.GetPixel(x, y).R < dgGrayValue)
387
                    bmpobj.SetPixel(x, y, Color.FromArgb(p[4], p[4], p[4]));    //给有效值付中值
388
                }
389
            }
390
        }
391
  
392
        /// <summary>
393
        /// 该函数用于对图像进行腐蚀运算。结构元素为水平方向或垂直方向的三个点,
394
        /// 中间点位于原点;或者由用户自己定义3×3的结构元素。
395
        /// </summary>
396
        /// <param name="dgGrayValue">前后景临界值</param>
397
        /// <param name="nMode">腐蚀方式:0表示水平方向,1垂直方向,2自定义结构元素。</param>
398
        /// <param name="structure"> 自定义的3×3结构元素</param>
399
        public void ErosionPic(int dgGrayValue, int nMode, bool[,] structure)
400
        {
401
            int lWidth = bmpobj.Width;
402
            int lHeight = bmpobj.Height;
403
            Bitmap newBmp = new Bitmap(lWidth, lHeight);
404
  
405
            int i, j, n, m;            //循环变量
406
  
407
            if (nMode == 0)
408
            {
409
                //使用水平方向的结构元素进行腐蚀
410
                // 由于使用1×3的结构元素,为防止越界,所以不处理最左边和最右边
411
                // 的两列像素
412
                for (j = 0; j < lHeight; j++)
413
                {
414
                    for (i = 1; i < lWidth - 1; i++)
415
                    {
416
                        //目标图像中的当前点先赋成黑色
417
                        newBmp.SetPixel(i, j, Color.Black);
418
  
419
                        //如果源图像中当前点自身或者左右有一个点不是黑色,
420
                        //则将目标图像中的当前点赋成白色
421
                        if (bmpobj.GetPixel(i - 1, j).R > dgGrayValue ||
422
                           bmpobj.GetPixel(i, j).R > dgGrayValue ||
423
                           bmpobj.GetPixel(i + 1, j).R > dgGrayValue)
424
                            newBmp.SetPixel(i, j, Color.White);
425
                    }
426
                }
427
            }
428
            else if (nMode == 1)
429
            {
430
                //使用垂真方向的结构元素进行腐蚀
431
                // 由于使用3×1的结构元素,为防止越界,所以不处理最上边和最下边
432
                // 的两行像素
433
                for (j = 1; j < lHeight - 1; j++)
434
                {
435
                    for (i = 0; i < lWidth; i++)
436
                    {
437
                        //目标图像中的当前点先赋成黑色
438
                        newBmp.SetPixel(i, j, Color.Black);
439
  
440
                        //如果源图像中当前点自身或者左右有一个点不是黑色,
441
                        //则将目标图像中的当前点赋成白色
442
                        if (bmpobj.GetPixel(i, j - 1).R > dgGrayValue ||
443
                           bmpobj.GetPixel(i, j).R > dgGrayValue ||
444
                            bmpobj.GetPixel(i, j + 1).R > dgGrayValue)
445
                            newBmp.SetPixel(i, j, Color.White);
446
                    }
447
                }
448
            }
449
            else
450
            {
451
                if (structure.Length != 9)  //检查自定义结构
452
                    return;
453
                //使用自定义的结构元素进行腐蚀
454
                // 由于使用3×3的结构元素,为防止越界,所以不处理最左边和最右边
455
                // 的两列像素和最上边和最下边的两列像素
456
                for (j = 1; j < lHeight - 1; j++)
457
                {
458
                    for (i = 1; i < lWidth - 1; i++)
459
                    {
460
                        //目标图像中的当前点先赋成黑色
461
                        newBmp.SetPixel(i, j, Color.Black);
462
                        //如果原图像中对应结构元素中为黑色的那些点中有一个不是黑色,
463
                        //则将目标图像中的当前点赋成白色
464
                        for (m = 0; m < 3; m++)
465
                        {
466
                            for (n = 0; n < 3; n++)
467
                            {
468
                                if (!structure[m, n])
469
                                    continue;
470
                                if (bmpobj.GetPixel(i + m - 1, j + n - 1).R > dgGrayValue)
471
                                {
472
                                    newBmp.SetPixel(i, j, Color.White);
473
                                    break;
474
                                }
475
                            }
476
                        }
477
                    }
478
                }
479
            }
480
            bmpobj = newBmp;
481
        }
482
  
483
        /// <summary>
484
        /// 该函数用于对图像进行细化运算。要求目标图像为灰度图像
485
        /// </summary>
486
        /// <param name="dgGrayValue"></param>
487
        public void ThiningPic(int dgGrayValue)
488
        {
489
            int lWidth = bmpobj.Width;
490
            int lHeight = bmpobj.Height;
491
            //   Bitmap newBmp = new Bitmap(lWidth, lHeight);
492
  
493
            bool bModified;            //脏标记  
494
            int i, j, n, m;            //循环变量
495
  
496
            //四个条件
497
            bool bCondition1;
498
            bool bCondition2;
499
            bool bCondition3;
500
            bool bCondition4;
501
  
502
            int nCount;    //计数器  
503
            int[,] neighbour = new int[5, 5];    //5×5相邻区域像素值
504
  
505
  
506
  
507
            bModified = true;
508
            while (bModified)
509
            {
510
                bModified = false;
511
  
512
                //由于使用5×5的结构元素,为防止越界,所以不处理外围的几行和几列像素
513
                for (j = 2; j < lHeight - 2; j++)
514
                {
515
                    for (i = 2; i < lWidth - 2; i++)
516
                    {
517
                        bCondition1 = false;
518
                        bCondition2 = false;
519
                        bCondition3 = false;
520
                        bCondition4 = false;
521
  
522
                        if (bmpobj.GetPixel(i, j).R > dgGrayValue)
523
                        {
524
                            if (bmpobj.GetPixel(i, j).R < 255)
525
                                bmpobj.SetPixel(i, j, Color.White);
526
                            continue;
527
                        }
528
  
529
                        //获得当前点相邻的5×5区域内像素值,白色用0代表,黑色用1代表
530
                        for (m = 0; m < 5; m++)
531
                        {
532
                            for (n = 0; n < 5; n++)
533
                            {
534
                                neighbour[m, n] = bmpobj.GetPixel(i + m - 2, j + n - 2).R < dgGrayValue ? 1 : 0;
535
                            }
536
                        }
537
  
538
                        //逐个判断条件。
539
                        //判断2<=NZ(P1)<=6
540
                        nCount = neighbour[1, 1] + neighbour[1, 2] + neighbour[1, 3]
541
                               + neighbour[2, 1] + neighbour[2, 3] +
542
                                +neighbour[3, 1] + neighbour[3, 2] + neighbour[3, 3];
543
                        if (nCount >= 2 && nCount <= 6)
544
                        {
545
                            bCondition1 = true;
546
                        }
547
  
548
                        //判断Z0(P1)=1
549
                        nCount = 0;
550
                        if (neighbour[1, 2] == 0 && neighbour[1, 1] == 1)
551
                            nCount++;
552
                        if (neighbour[1, 1] == 0 && neighbour[2, 1] == 1)
553
                            nCount++;
554
                        if (neighbour[2, 1] == 0 && neighbour[3, 1] == 1)
555
                            nCount++;
556
                        if (neighbour[3, 1] == 0 && neighbour[3, 2] == 1)
557
                            nCount++;
558
                        if (neighbour[3, 2] == 0 && neighbour[3, 3] == 1)
559
                            nCount++;
560
                        if (neighbour[3, 3] == 0 && neighbour[2, 3] == 1)
561
                            nCount++;
562
                        if (neighbour[2, 3] == 0 && neighbour[1, 3] == 1)
563
                            nCount++;
564
                        if (neighbour[1, 3] == 0 && neighbour[1, 2] == 1)
565
                            nCount++;
566
                        if (nCount == 1)
567
                            bCondition2 = true;
568
  
569
                        //判断P2*P4*P8=0 or Z0(p2)!=1
570
                        if (neighbour[1, 2] * neighbour[2, 1] * neighbour[2, 3] == 0)
571
                        {
572
                            bCondition3 = true;
573
                        }
574
                        else
575
                        {
576
                            nCount = 0;
577
                            if (neighbour[0, 2] == 0 && neighbour[0, 1] == 1)
578
                                nCount++;
579
                            if (neighbour[0, 1] == 0 && neighbour[1, 1] == 1)
580
                                nCount++;
581
                            if (neighbour[1, 1] == 0 && neighbour[2, 1] == 1)
582
                                nCount++;
583
                            if (neighbour[2, 1] == 0 && neighbour[2, 2] == 1)
584
                                nCount++;
585
                            if (neighbour[2, 2] == 0 && neighbour[2, 3] == 1)
586
                                nCount++;
587
                            if (neighbour[2, 3] == 0 && neighbour[1, 3] == 1)
588
                                nCount++;
589
                            if (neighbour[1, 3] == 0 && neighbour[0, 3] == 1)
590
                                nCount++;
591
                            if (neighbour[0, 3] == 0 && neighbour[0, 2] == 1)
592
                                nCount++;
593
                            if (nCount != 1)
594
                                bCondition3 = true;
595
                        }
596
  
597
                        //判断P2*P4*P6=0 or Z0(p4)!=1
598
                        if (neighbour[1, 2] * neighbour[2, 1] * neighbour[3, 2] == 0)
599
                        {
600
                            bCondition4 = true;
601
                        }
602
                        else
603
                        {
604
                            nCount = 0;
605
                            if (neighbour[1, 1] == 0 && neighbour[1, 0] == 1)
606
                                nCount++;
607
                            if (neighbour[1, 0] == 0 && neighbour[2, 0] == 1)
608
                                nCount++;
609
                            if (neighbour[2, 0] == 0 && neighbour[3, 0] == 1)
610
                                nCount++;
611
                            if (neighbour[3, 0] == 0 && neighbour[3, 1] == 1)
612
                                nCount++;
613
                            if (neighbour[3, 1] == 0 && neighbour[3, 2] == 1)
614
                                nCount++;
615
                            if (neighbour[3, 2] == 0 && neighbour[2, 2] == 1)
616
                                nCount++;
617
                            if (neighbour[2, 2] == 0 && neighbour[1, 2] == 1)
618
                                nCount++;
619
                            if (neighbour[1, 2] == 0 && neighbour[1, 1] == 1)
620
                                nCount++;
621
                            if (nCount != 1)
622
                                bCondition4 = true;
623
                        }
624
  
625
                        if (bCondition1 && bCondition2 && bCondition3 && bCondition4)
626
                        {
627
                            bmpobj.SetPixel(i, j, Color.White);
628
                            bModified = true;
629
                        }
630
                        else
631
                        {
632
                            bmpobj.SetPixel(i, j, Color.Black);
633
                        }
634
                    }
635
                }
636
            }
637
            // 复制细化后的图像
638
            //    bmpobj = newBmp;
639
        }
640
  
641
        /// <summary>
642
        /// 锐化要启用不安全代码编译
643
        /// </summary>
644
        /// <param name="val">锐化程度。取值[0,1]。值越大锐化程度越高</param>
645
        /// <returns>锐化后的图像</returns>
646
        public void Sharpen(float val)
647
        {
648
            int w = bmpobj.Width;
649
            int h = bmpobj.Height;
650
            Bitmap bmpRtn = new Bitmap(w, h, PixelFormat.Format24bppRgb);
651
            BitmapData srcData = bmpobj.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
652
            BitmapData dstData = bmpRtn.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
653
            unsafe
654
            {
655
                byte* pIn = (byte*)srcData.Scan0.ToPointer();
656
                byte* pOut = (byte*)dstData.Scan0.ToPointer();
657
                int stride = srcData.Stride;
658
                byte* p;
659
  
660
                for (int y = 0; y < h; y++)
661
                {
662
                    for (int x = 0; x < w; x++)
663
                    {
664
                        //取周围9点的值。位于边缘上的点不做改变。
665
                        if (x == 0 || x == w - 1 || y == 0 || y == h - 1)
666
                        {
667
                            //不做
668
                            pOut[0] = pIn[0];
669
                            pOut[1] = pIn[1];
670
                            pOut[2] = pIn[2];
671
                        }
672
                        else
673
                        {
674
                            int r1, r2, r3, r4, r5, r6, r7, r8, r0;
675
                            int g1, g2, g3, g4, g5, g6, g7, g8, g0;
676
                            int b1, b2, b3, b4, b5, b6, b7, b8, b0;
677
  
678
                            float vR, vG, vB;
679
  
680
                            //左上
681
                            p = pIn - stride - 3;
682
                            r1 = p[2];
683
                            g1 = p[1];
684
                            b1 = p[0];
685
  
686
                            //正上
687
                            p = pIn - stride;
688
                            r2 = p[2];
689
                            g2 = p[1];
690
                            b2 = p[0];
691
  
692
                            //右上
693
                            p = pIn - stride + 3;
694
                            r3 = p[2];
695
                            g3 = p[1];
696
                            b3 = p[0];
697
  
698
                            //左侧
699
                            p = pIn - 3;
700
                            r4 = p[2];
701
                            g4 = p[1];
702
                            b4 = p[0];
703
  
704
                            //右侧
705
                            p = pIn + 3;
706
                            r5 = p[2];
707
                            g5 = p[1];
708
                            b5 = p[0];
709
  
710
                            //右下
711
                            p = pIn + stride - 3;
712
                            r6 = p[2];
713
                            g6 = p[1];
714
                            b6 = p[0];
715
  
716
                            //正下
717
                            p = pIn + stride;
718
                            r7 = p[2];
719
                            g7 = p[1];
720
                            b7 = p[0];
721
  
722
                            //右下
723
                            p = pIn + stride + 3;
724
                            r8 = p[2];
725
                            g8 = p[1];
726
                            b8 = p[0];
727
  
728
                            //自己
729
                            p = pIn;
730
                            r0 = p[2];
731
                            g0 = p[1];
732
                            b0 = p[0];
733
  
734
                            vR = (float)r0 - (float)(r1 + r2 + r3 + r4 + r5 + r6 + r7 + r8) / 8;
735
                            vG = (float)g0 - (float)(g1 + g2 + g3 + g4 + g5 + g6 + g7 + g8) / 8;
736
                            vB = (float)b0 - (float)(b1 + b2 + b3 + b4 + b5 + b6 + b7 + b8) / 8;
737
  
738
                            vR = r0 + vR * val;
739
                            vG = g0 + vG * val;
740
                            vB = b0 + vB * val;
741
  
742
                            if (vR > 0)
743
                            {
744
                                vR = Math.Min(255, vR);
745
                            }
746
                            else
747
                            {
748
                                vR = Math.Max(0, vR);
749
                            }
750
  
751
                            if (vG > 0)
752
                            {
753
                                vG = Math.Min(255, vG);
754
                            }
755
                            else
756
                            {
757
                                vG = Math.Max(0, vG);
758
                            }
759
  
760
                            if (vB > 0)
761
                            {
762
                                vB = Math.Min(255, vB);
763
                            }
764
                            else
765
                            {
766
                                vB = Math.Max(0, vB);
767
                            }
768
  
769
                            pOut[0] = (byte)vB;
770
                            pOut[1] = (byte)vG;
771
                            pOut[2] = (byte)vR;
772
                        }
773
                        pIn += 3;
774
                        pOut += 3;
775
                    }// end of x
776
                    pIn += srcData.Stride - w * 3;
777
                    pOut += srcData.Stride - w * 3;
778
                } // end of y
779
            }
780
            bmpobj.UnlockBits(srcData);
781
            bmpRtn.UnlockBits(dstData);
782
            bmpobj = bmpRtn;
783
        }
784
  
785
        /// <summary>
786
        /// 图片二值化
787
        /// </summary>
788
        /// <param name="hsb"></param>
789
        public void BitmapTo1Bpp(Double hsb)
790
        {
791
            int w = bmpobj.Width;
792
            int h = bmpobj.Height;
793
            Bitmap bmp = new Bitmap(w, h, PixelFormat.Format1bppIndexed);
794
            BitmapData data = bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format1bppIndexed);
795
            for (int y = 0; y < h; y++)
796
            {
797
                byte[] scan = new byte[(w + 7) / 8];
798
                for (int x = 0; x < w; x++)
799
                {
800
                    Color c = bmpobj.GetPixel(x, y);
801
                    if (c.GetBrightness() >= hsb) scan[x / 8] |= (byte)(0x80 >> (x % 8));
802
                }
803
                Marshal.Copy(scan, 0, (IntPtr)((int)data.Scan0 + data.Stride * y), scan.Length);
804
            }
805
            bmp.UnlockBits(data);
806
            bmpobj = bmp;
807
        }
808
    }
809
}

  

C# 验证识别基类

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