识别CSDN验证码的思路

csdn可以说的技术界的老大了，而CSDN的验证码识别如下，看如下代码 简单验证码的识别:CSDN验证码的识别 取图像部分,ASP.NET_SessionID=这个值你要自己取这样的话就可以做成自动登录了 private Streamgeturl( ref string str) { stringurl="http://www.csdn.net/member/ShowExPwd.aspx"; WebRequestmyWebRequest=WebRequest.Create(url); myWebRequest.Headers.Add("Cookie","ASP.NET_SessionId=tr0p4g45xa0qzg45bmlqprnn"); WebResponsemyWebResponse=myWebRequest.GetResponse(); StreamReceiveStream=myWebResponse.GetResponseStream(); str=myWebResponse.Headers[6]; returnReceiveStream; } private string getNumber() { stringstr; str=""; StreamgeturlStream=geturl(refstr); Bitmapmap=newBitmap(geturlStream,false); pictureBox1.Image=(Image)map; csdncsdn1=newcsdn(); returncsdn1.readMap(map)+str; } 验证码识别部分(很简单类型的): 分割图片变成四个部分. 接下来判断象素点.再判断特征点 100%识别 usingSystem; usingSystem.Drawing; usingSystem.Drawing.Drawing2D; usingSystem.Drawing.Imaging; namespacebinbin { /**//// ///Class1的摘要说明。 /// publicclasscsdn { publiccsdn() { } publicstringreadMap(Bitmapimage) { stringstr; RectangleF[]block=newRectangleF[4]; block[0]=newRectangle(3,0,8,18); block[1]=newRectangle(12,0,8,18); block[2]=newRectangle(21,0,8,18); block[3]=newRectangle(30,0,8,18); //分别克隆图片的四个部分 Bitmap[]s=newBitmap[4]; s[0]=image.Clone(block[0],PixelFormat.DontCare); s[1]=image.Clone(block[1],PixelFormat.DontCare); s[2]=image.Clone(block[2],PixelFormat.DontCare); s[3]=image.Clone(block[3],PixelFormat.DontCare); str=ReadMap(s[0]).ToString(); str=str+ReadMap(s[1]).ToString(); str=str+ReadMap(s[2]).ToString(); str=str+ReadMap(s[3]).ToString(); returnstr; } privateintReadMap(Bitmapk) { intn=0; intm=0; Colorcolor; for(inti=7;i>=0;i--) { for(intj=17;j>=0;j--) { color=k.GetPixel(i,j); if(color.GetBrightness()==1.0) { n=n+1;//白色点 } else { m=m+1;//蓝色点 } } } switch(m) { case22: color=k.GetPixel(7,12); if(color.GetBrightness()==1) { return2; } else { return3; } case25: return4; case26: return5; case28: return0; case30: return8; case18://1829还要特殊处理 color=k.GetPixel(7,4); if(color.GetBrightness()==1) { return1; } else { return7; } case29: color=k.GetPixel(1,15); if(color.GetBrightness()==1) { return6; } else { return9; } default: break; } return-1; } } }