Re: NASA HQ Raided In Kiddie Porn Probe

["Rob, grandpa of Ryan, Trevor, Devon & Hannah" <rMslade () shaw ca>]

From:                   "Fergie" <fergdawg () netzero net>
Date sent:              Fri, 31 Mar 2006 20:11:08 GMT

> Does anyone know anything about the technical details of the
> 'Web ContExt' thingy they mentioned?

I was a little surprised that it was "state of the art": I recall when they came out 
(with those programs) six or seven years ago.

Skin tones (and it doesn't seem to matter whose skin) have a mathematical 
"texture" that is easily identifiable.  (The analysis is similar to that which 
identifies graphics that have been subject to steganography.)  The early versions 
of these proggies were fairly primitive: if you had more than 10% skin tone in a 
picture you could assume it was either porn or baby pictures.

I assume that this is now married to some variation on face recognition, where 
you can pull out "features" that distinguish naked children (more angular and 
rectangular) from naked adults (smoother curves, generally).  (Face recognition 
works on classifications of three dimensional curves and eigenvectors.)

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http://victoria.tc.ca/techrev/rms.htm
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