c#实现识别图片上的验证码数字

{ int posx1 = singlepic.Width; int posy1 = singlepic.Height;

int posx2 = 0; int posy2 = 0; for (int i = 0; i < singlepic.Height; i++) //找有效区

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

{ int pixelValue = singlepic.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; };

}; };

//复制新图 Rectangle cloneRect = new Rectangle(posx1, posy1, posx2 - posx1 + 1, posy2 - posy1 + 1);

return singlepic.Clone(cloneRect, singlepic.PixelFormat); }

/// <summary>

/// 平均分割图片 /// </summary>

/// <param name="RowNum">水平上分割数</param> /// <param name="ColNum">垂直上分割数</param>

/// <returns>分割好的图片数组</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++) //找有效区 {

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);//复制小块图

} }

return PicArray; }

/// <summary>