c#实现识别图片上的验证码数字

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

}

bmpobj.UnlockBits(bmpData); }

/// <summary>

/// 得到有效图形并调整为可平均分割的大小 /// </summary>

/// <param name="dgGrayValue">灰度背景分界值</param> /// <param name="CharsCount">有效字符数</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)