编写软件 DeCaptcha library

we need the decaptcha library with our developing program requirment: 1. dedicated to a series of captcha with 4 or 6 alphabet and numerical characters. 2. response time is less than 1 seconds. 3. the library can be read by perl/python. 我们的程式需要一个decaptcha库, 要求如下 1) 专用于一组验证码.当中有4个或6个由字母和数字组成的验证图。 2) 回应时间小于1秒。 3) 该库可以被Perl/ Python的读取。