On Tue, 2007-06-12 at 08:01 -0400, tedd wrote:
> At 3:02 PM -0400 6/11/07, Robert Cummings wrote:
> >OCR is extremely fast. I've done work in the past using OCR and while it
> >was simple text in documents, the OCR program could extract the text
> >from the image of a magazine page in about a second. For simplistic
> >displays of text, or even only slight noise, the OCR will beat human
> >hands down every time.
> >
> >Cheers,
> >Rob.
>
> Rob:
>
> I was thinking about this the other day -- computers are fast and
> people are generally slow. So, instead of making the time short,
> examine how fast the answer was obtained. Immediate = computer;
> delayed = human.
>
> Even an easy LETTER CAPTCHA takes time for a human, but a computer
> can recognize and respond much quicker.
>
> I know, spammy can delay his bot's response, but it's just a
> difference between computer/human to consider.
>
> For example, what if a LETTER CAPTCHA provided letters in a timed
> sequence? Such as:
>
> A
>
> then .6 seconds (time delay random from .1 to 2 seconds)
>
> AS
>
> then 1.1 seconds
>
> ASD
>
> Would there be a consistent time difference between the way a
> computer would read/respond to the letters as compared to a human? I
> dunno, but it's food for thought.
Human times are only predicatable beyond a certain speed. But computers
can easily mimic a delay:
<?php
usleep( 500000 + rand( 1, 3000000 ) );
?>
Cheers,
Rob.
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