> -----Original Message----- > From: Erik Reuter [mailto:[EMAIL PROTECTED] > Sent: Monday, September 29, 2003 6:55 AM > To: Killer Bs Discussion > Subject: Re: The Eyes Have It > > > On Mon, Sep 29, 2003 at 08:43:14AM -0400, David Hobby wrote: > > > Oh. Good to know. Just to clarify, that's around 10,000 > > Angstroms, and "above" means "of longer wavelength"? > > Yes. The tinting is usually done with a semiconducting > material, so light with wavelength longer than the bandgap > wavelength will pass. You can also tint by partially > "silvering" the glass, but this introduces reflections which > may be distracting.
There is also polarization that may help, but I would think principally, you only need to to scatter the light enough to blur the image. Contact lenses can be made to be reflective, to completely obscure the iris, while letting light through to the lens. The silvering could be applied to the contact lens. See http://www.wild-eyes.com/flash.htm . > > So you think that would be the method? Just pick a > wavelength where > > glasses/contacts are probably transparent, and work there. > > No idea. Like you, I wonder about resolution. It seems it > would take some really good (expensive) optics to get > adequate resolution from a distance. Current video merely captures EM radiation of specific wavelengths. Optics may provide some range, but it would be prone to glare. Another consideration is that in order to get better resolution, some smarts needs to be built into the camera system to zoom to the correct location, the eyes. Sunglasses may very well mask the face recgonition algorythmns to make it harder to zoom onto the eyes. Simply stated, this technology is already easily defeated. I could wear contact lenses that appear to look natural, but in fact, appear like someone else's. this security method will only catch those that are not aware they are being (or will be) scanned. What is truly alarming, is that the intent of this security method is to perform security metrics without consent or direct knowledge. Fingerprinting profiling is more accurate, and harder to spoof, it requires explicit consent and knowledge. Nerd From Hell > > > -- > Erik Reuter http://www.erikreuter.net/ > _______________________________________________ > http://www.mccmedia.com/mailman/listinfo/brin-l > _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
