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Comment: Questionable (Score 1) 272

by ptresadern (#41299775) Attached to: Activision Blizzard Secretly Watermarking World of Warcraft Users
Okay, so there's some pattern that shows up against a completely untextured view of the world. How would they recover such a faint watermark from an ordinary view of the world, complete with complex textures in the background? For that sort of thing, you need a copy of the image without the watermark so that you can take the difference between the two, and that doesn't seem to be the case here. And if you wanted to covertly record someone's data, why go to this effort when you could just send it to your server without telling them?

Comment: Storm in a teacup (Score 1) 294

by ptresadern (#41257771) Attached to: Google Patents Profit-Maximizing Dynamic Pricing
If it ever makes into reality (I doubt it will), you will be given a simple choice: pay whatever some algorithm believes you are prepared to cough up even if it's more than everybody else, has overestimated your income, net worth, etc, etc; or go to a high street store where you pay the price on the sticker, no questions asked. This scheme could be just the saviour that the high street has been waiting for. And to those who say it's only a form of bargaining and the workings of supply/demand market forces, imagine your employer giving you a pay cut because they heard you just inherited some money from a recently deceased relative (after all, you don't need as much money now, right?) There's already a place where supply/demand forces work in the way they were intended - it's called eBay.

Comment: Re:OpenCV (Score 1) 139

by ptresadern (#33347164) Attached to: Real-Time, Detailed Face Tracking On a Nokia N900
As already mentioned, getting the user to move their head and checking for the correct 3D effect solves this problem (known as 'liveness detection'). In our case, we actually use combined face and voice recognition where the user needs to answer a question posed by the phone - we can therefore check for the lips moving to make sure it's not a photo. Showing a video could potentially spoof the system (any system is hackable - it's just a question of whether it's worth the effort) but there are almost certainly differences that we can detect between light reflected from a real object and the light generated by a video screen. Same goes for sound.

Comment: Re:Gut reaction.. (Score 1) 139

by ptresadern (#33347084) Attached to: Real-Time, Detailed Face Tracking On a Nokia N900
I actually agree - the recognition will need to prove its worth before I put my bank account in its hands. This is, however, a long-term goal and the reality is we'll get there mostly with baby steps. In the short-term, it'd be a piece of cake to capture an image of your face as you're entering your password as an additional (rather than substitute) level of security. Other obvious ethical issues include where and how your biometric 'fingerprint' is stored - on the phone (don't lose it) or a central database (who's in charge of that?)

Comment: Re:Some weird anomalies in that video... (Score 1) 139

by ptresadern (#33346994) Attached to: Real-Time, Detailed Face Tracking On a Nokia N900
Spot on - it models the whole face in one go rather than each feature independently. So as long as most of the face is visible it will guess the positions of the bits it can't see based on the bits it can. The more face gets hidden, however, the worse this guess gets. For most practical purposes you can assume that there's a clear line of sight between the camera and the face.
Handhelds

+ - Real-time, detailed face tracking on a Nokia N900->

Submitted by ptresadern
ptresadern (1882962) writes "Researchers at the University of Manchester this week revealed a detailed face tracker that runs in real-time on the Nokia N900 mobile phone. Unlike existing mobile face trackers that give an approximate position and scale of the face, Manchester's embedded Active Appearance Model accurately tracks a number of landmarks on and around the face such as the eyes, nose, mouth and jawline. The extra level of detail that this provides potentially indicates who the user is, where they are looking and how they are feeling. The face tracker was developed as part of a face- and voice-verification system for controlling access to mobile internet applications such as e-mail, social networking and on-line banking."
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