There is a new research on the ways people walk. With this method, they can tell who anyone is, just by the way the person walks. Here is a few quotes, and an external resource.

 

"When a person walks, body parts — the legs, knee joints, arms, elbows, and so on — create a particular repeating pattern as they each move through space. The video camera captures these points of movements and sends them to a computer for analysis. The computer notes the movements and establishes mathematical relationships for each point to create the "signature" patterns it needs to recognize for each individual."

 

http://www.abcnews.go.com/sections/scitech/CuttingEdge/cuttingedge021025.html

I checked it out Syntax. It seems it will be useful piggybacked on other recognition software but as we age, I feel how we walk day to day will have a lot to do with how our backs felt when we woke up in the morning.

Thanks for the new info

Just aman