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

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

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 

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