用指针那是相当的快。。相当的爽。。。普通验证码基本1ms之内解决掉

这里暂时是RGB2L法，要RGB2H的改一下就好
编译好的类


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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;

namespace Binary
{
    public class CSunsafe
    {
        private System.Drawing.Bitmap curBitmap;
        private int[,] pic;

        public void File_Init(string sFilename)
        {
            if (sFilename != null)
            {
                curBitmap = (Bitmap)Image.FromFile(sFilename);
            }
        }

        public void BMP_Init(Bitmap BMP)
        {
            if (BMP != null)
            {
                curBitmap = BMP;
            }
        }

        private double Max(double a, double b)
        {
            if (a > b)
            {
                return a;
            }
            return b;
        }

        private double Min(double a, double b)
        {
            if (a < b)
            {
                return a;
            }
            return b;
        }

        private double RGB2H(double r, double g, double b)
        {
            double h;
            r /= 255.0;
            g /= 255.0;
            b /= 255.0;
            double mi = this.Min(r, this.Min(g, b));
            double ma = this.Max(r, this.Max(g, b));
            h = 0;
            double del_max = ma - mi;
            if (del_max == 0.0)
            {
                return 0.0;
            }
            double del_r = ((ma - (r / 6.0)) + (del_max / 2.0)) / del_max;
            double del_g = ((ma - (g / 6.0)) + (del_max / 2.0)) / del_max;
            double del_b = ((ma - (b / 6.0)) + (del_max / 2.0)) / del_max;

            if (r == ma)
            {
                h = del_b - del_g;
            }
            else if (g == ma)
            {
                h = (1.0/3.0 + del_r) - del_b;
            }
            else if (b == ma)
            {
                h = (2.0/3.0 + del_g) - del_r;
            }
            if (h < 0.0)
            {
                h++;
            }
            if (h > 1.0)
            {
                h--;
            }
            return h;
        }


        private double RGB2L(double r, double g, double b)
        {
            r /= 255.0;
            g /= 255.0;
            b /= 255.0;
            double mi = this.Min(r, this.Min(g, b));
            return ((this.Max(r, this.Max(g, b)) + mi) / 2.0);
        }


        public int[,] Binary(double value)
        {
            if (curBitmap != null)
            {
                Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
                System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
                pic = new int [bmpData.Width,bmpData.Height];
                unsafe
                {
                    byte* ptr = (byte*)(bmpData.Scan0);
                    for (int i = 0; i < bmpData.Height; i++)
                    {
                        for (int j = 0; j < bmpData.Width; j++)
                        {
                            if (RGB2L(ptr[2], ptr[1], ptr[0]) < value)
                            {
                                pic[j, i] = 1;
                            }
                            else
                            {
                                pic[j, i] = 0;
                            }
                            
                            ptr += 3;
                        }
                        ptr += bmpData.Stride - bmpData.Width * 3;
                    }
                }
                curBitmap.UnlockBits(bmpData);
                return pic;
            }
            else
            {
                return null;
            }
        }
    }
}


要编译本代码请允许不安全代码 如下图所示