Mechanize users - Jun 2010 - CAPTCHA Code

Hello,

Is possible detect CAPTCHA code with mechanize or any other gem?

Thanks!

Andr? Lima
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Hello list, Andr? Lima!

Well I do not know any gems in specific for this and it isn''t really a 
Mechanize related topic, but I''ve had dealt with CAPTCHA
''problems''
before so...

The question is, how difficult the CAPTCHA is, you want to solve. 
Sometimes its enough to just enhance the image somehow and then use a 
OCR engine to detect it. Arguably the best OCR engine is Finereader, but 
for simple CAPTCHAs gocr should suffice. You can spent a lot of 
time/resources on engineering and OCR training of a specific CAPTCHA and 
breaking and generating CAPTCHAs is a constant topic in the field of 
computer science / computer vision (there many papers about these topics).

There are however very good CAPTCHAs out there that you simply cannot 
break automatically (like Recaptcha), they are mostly focusing on making 
the seperation process (seperating characters from eachother) as hard as 
possible. The only chance you have to automate the detection process, is 
to use human resources, there some services like deCaptcher.com that 
provide human captcha recognition for 2$ per 1000 detected CAPTCHAs, 
that may a solution for some cases.

That''s just some brief glimpse on this topic, without really knowing 
what you''re up to.

Matthias

On 06/16/2010 02:46 PM, Andr? Lima wrote:
> Hello,
>
> Is possible detect CAPTCHA code with mechanize or any other gem?
>
> Thanks!
>
> Andr? Lima
>
>
>
>
> _______________________________________________
> Mechanize-users mailing list
> Mechanize-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mechanize-users

Many Thanks,

I will read more about OCR!

Andre Lima


On Thu, Jun 17, 2010 at 2:29 AM, Matthias -apoc- Hecker <apoc at
sixserv.org>wrote:
> Hello list, Andr? Lima!
>
> Well I do not know any gems in specific for this and it isn''t
really a
> Mechanize related topic, but I''ve had dealt with CAPTCHA
''problems'' before
> so...
>
> The question is, how difficult the CAPTCHA is, you want to solve. Sometimes
> its enough to just enhance the image somehow and then use a OCR engine to
> detect it. Arguably the best OCR engine is Finereader, but for simple
> CAPTCHAs gocr should suffice. You can spent a lot of time/resources on
> engineering and OCR training of a specific CAPTCHA and breaking and
> generating CAPTCHAs is a constant topic in the field of computer science /
> computer vision (there many papers about these topics).
>
> There are however very good CAPTCHAs out there that you simply cannot break
> automatically (like Recaptcha), they are mostly focusing on making the
> seperation process (seperating characters from eachother) as hard as
> possible. The only chance you have to automate the detection process, is to
> use human resources, there some services like deCaptcher.com that provide
> human captcha recognition for 2$ per 1000 detected CAPTCHAs, that may a
> solution for some cases.
>
> That''s just some brief glimpse on this topic, without really
knowing what
> you''re up to.
>
> Matthias
>
>
> On 06/16/2010 02:46 PM, Andr? Lima wrote:
>
>> Hello,
>>
>> Is possible detect CAPTCHA code with mechanize or any other gem ?
>>
>> Thanks!
>>
>> Andr? Lima
>>
>>
>>
>>
>> _______________________________________________
>> Mechanize-users mailing list
>> Mechanize-users at rubyforge.org
>> http://rubyforge.org/mailman/listinfo/mechanize-users
>>
> _______________________________________________
> Mechanize-users mailing list
> Mechanize-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mechanize-users
>


-- 
Atenciosamente,

Andr? Lima
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