If you needed any more evidence that the "cyberpunk future" is here, this article has to be it.

A friend of mine has an idea for a project to build a tiara or necklace, loaded with IR emitters, to emit enough IR radiation in the vicinity of her head/face to blur her face out in pictures/video taken by surveillance cameras / Google Glass / etc. Most cheap cameras digital cameras (at least) do seem to pick up IR radiation so it will probably work, at least for a while. But I wonder if camera makers won't eventually start putting IR filters in? Or maybe some already do?

I think that P.K. Dick saw the future with his 'scramble suits': http://www.technovelgy.com/ct/content.asp?Bnum=997

...the wearer of a scramble suit was Everyman and in every combination...

...now made irrelevant by gait analysis.

Couldn't you deter that by just putting a rock in your shoe?

little brother style

Why is the "stealth hoodie" just chest-up?

BTW snipers have been quite aware of the issue for some time. Tales told of a sniper defeating a demonstration of an expensive automatic anti-sniper system by borrowing someone's umbrella...

From TFA: "In theory, this limits one’s visibility to aerial surveillance vehicles employing heat-imaging cameras to track people on the ground."

To illustrate the difference in visibility, I'd imagine.