Sonar Software Detects Laptop User Presence

Steve Tarzia writes "A research group at Northwestern University and University of Michigan has released open-source display power-management software that uses a new user presence detection technique. The goal is to shut off the display immediately when the user leaves the computer rather than using slow and error-prone mouse/keyboard activity timeouts. Surprisingly, the mic and speakers of many laptop computers are sensitive to ultrasonic frequencies. Those frequencies can be used to silently probe the laptop's physical environment. This software is based on research published at the UbiComp2009 conference. A Windows binary and source code for Windows and Linux are available for download."

Comments

Re:Activity

[lordandmaker]

Mouse/keyboard activity timeout works nicely for that.

I find it doesn't. My PC at work has to be configured to require a password be entered on exiting the screensaver, and my password has to be quite complex. If I'm working on something that's not the PC (yeah, we still use paper for things) for longer than the minute, I've got to enter my password to carry on, which is irritating.
It's less irritating when it kicks in when I'm reading or watching a video or something, but I'd still prefer it not to, and I really don't see the privacy angle on this. It's no idea where I am, just that there's something in front of it.

But, generally, I don't have much of a problem with my computer knowing all sorts of stuff about me, it's what it tells to who that I concern myself with.

Re:I wonder how...

[tkw954]

Asus ships the software you're describing with laptops they sell; it came on mine. It takes a bunch of snapshots of your face through the webcam (you're supposed to rotate your head) and then if it sees your face at the login screen, it logs you in.

So all I need to log on to your computer is a lifesize photo of you, or alternately, your severed head?