C#联通新版验证码识别的实现[转]

以前写了篇 联通充值卡自动充值的实现,最近发现联通官网改版了,随便看了下发现新版的验证码和以前的不同,发了点时间研究了下他的识别码,它现在的验证码如下

C#联通新版验证码识别的实现[转]

现在将识别步骤说下

1,转换灰度图片

2,清除2px的边框

3,分割验证码个数 (4)

4,生成字模库

经过以上步骤,可以得到下面这个效果

C#联通新版验证码识别的实现[转]

下面为部分实现代码

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public   String GetCheckString(Bitmap bitmap) {
            UnCodebase ud = new   UnCodebase(bitmap);
            ud.GrayByPixels();
            ud.ClearPicBorder(2);
            ud.CutMap(14, 15, 0, 0);
            bitmap = ud.bmpobj;
          //  bitmap = ud.ClearNoise(128, 1);
            String chkcode = "" ;
            Bitmap[] arrmap = ud.SplitImg(bitmap, 4, 1);
            foreach   (Bitmap item in   arrmap) {
                String str = ud.GetCodebybitmap(item, 128);
                Boolean isEques = false ;
                foreach   (String strss in   code) {
                    String[] a = strss.Split( ':' );
                    if   (str == a[1]) {
                        chkcode += a[0];
                        isEques = true ;
                        break ;
                    }
                }
                if   (!isEques) {
                    String strCurrent = "" ;
                    double   max = 0.0;
                    foreach   (String strss in   code) {
                        int   len1, len2, min, count = 0;
                        String[] a = strss.Split( ':' );
                        len1 = a[1].Length;
                        len2 = str.Length;
                        min = len1;
                        if   (min > len2) {
                            min = len2;
                        }
                        for   ( int   i = 0; i < min; i++) {
                            if   (str[i] == a[1][i]) {
                                count++;
                            }
                        }
                        double   currrent = (count * 100.0 / min);
                        if   (max < currrent) {
                            max = currrent;
                            strCurrent = a[0].Trim();
                        }
                    }
                    chkcode += strCurrent.Trim();
                }
            }
            return   chkcode;
        }

通过这些处理后,识别成功率在90+%以上,

下面附上测试地址,代码  100%C#实现,方便asp.net调用,如果是C/C++实现 asp.net 调非托管的有些麻烦,非得放到System32 或是一个绝对路径下麻烦

测试地址

http://www.fox163.com/UniconTest.aspx 

--幸福海

博客地址:http://www.cnblogs.com/ningqhai/

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