Chinese authorities have begun deploying a new surveillance tool called "gait recognition" software that uses people's body shapes and how they walk to identify them, even when their faces are hidden from cameras.

I used to know a chemist who worked on CMOS sensors and told me the sensors were going into gear that could identify someone based on the iris (of your eye) at FIFTY YARDS. Ten years ago. Without people knowingly participating in being iris-printed at any point. The goal was to identify people coming into a building who hadn't been there before from a static ceiling-mounted camera, and the project exceeded all the stated requirements.

The popular conception about where surveillance and identification technology stands seems to be about ten years behind what the industry at large is currently doing, which in turn is probably another 10 years behind what intelligence agencies are using.

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