5 ms·
Apple's Face ID uses what is essentially a 3D camera, a simple 2D color camera cannot compare to that in terms of accuracy.
by e-topy 1y ago
Apple's Face ID uses what is essentially a 3D camera, a simple 2D color camera cannot compare to that in terms of accuracy.
- lozenge 1y agoWindows also uses infrared LEDs to light your face and prevent a flat photo from being recognised as a face.
- throwaway889900 1y agoWindows is an operating system and does not have dependence on specific hardware being present.
- 98codes 1y agoThere are definitely webcams that work with Windows Hello, and those that don't.
- zettabomb 1y agoIncorrect. Windows Hello uses special hardware.
- throwaway889900 1y agoRight, Windows Hello requires it for facial auth, Windows itself does not. Hello still works, just you have to authenticate with a different method if the hardware isn't present.
- KetoManx64 1y agoHow little is your time worth that you spend it making pedantic little correctioms like this?
- AStonesThrow 1y ago[dead]
- throwaway889900 1y agoBored at work lol
- aniviacat 1y agoAFAIK Pixel phones, including the Pixel 9, only use 2D images for face unlock. So it's definitely possible to reach mainstream quality with conventional cameras. (Unless you'd argue that the face unlock found on Pixels is not passable either)
- MengerSponge 1y agoI don't know how Google does it, but it's possible to extract 3d information from a 2d sensor. You either need a variable focus or phase detection in the sensor.
- westurner 1y agoIt is possible to infer phase from second order intensity via the Huygens-Steiner theorem for rigid body rotation, FWIU: https://news.ycombinator.com/item?id=42663342 https://news.ycombinator.com/item?id=42663342 .. https://news.ycombinator.com/item?id=37226121#37226160 https://news.ycombinator.com/item?id=37226121#37226160 Doesn't that mean that any camera can be used to infer phase (and thus depth for face ID, which is a high risk application)? > variable focus A light field camera (with "infinite" focus) would also work.
- MengerSponge 1y agoVery cool. Yes, probably? I'll have to think about the relationship between image quality and the fidelity of the derived phase measurement, because it's not obvious how good a camera needs to be to be "good enough" for a secure system. Light field? I remember Lytro! Such cool technology that never found its niche. https://en.wikipedia.org/wiki/Lytro https://en.wikipedia.org/wiki/Lytro Is anybody making a successor product?
- westurner 1y agoI guess the task is to design an experiment to test the error between phase inferred from intensity in a digital camera by Huygens-Steiner and a barycentric coordinate map And far more expensive photonic phase sensors. Is (framerate-1 Hz) a limit, due to the discrete derivative being null for the first n points? Fortunately this article explained the implications of said breakthrough; "Physicists use a 350-year-old theorem [Huygens-Steiner] to reveal new properties of light waves" https://phys.org/news/2023-08-physicists-year-old-theorem-reveal-properties.amp https://phys.org/news/2023-08-physicists-year-old-theorem-re... : > This means that hard-to-measure optical properties such as amplitudes, phases and correlations—perhaps even these of quantum wave systems—can be deduced from something a lot easier to measure: light intensity. IDK what happened with wave field cameras like the Lytro. They're possibly useful for face ID, too? "SAR wavefield". There's a thing. From https://news.ycombinator.com/item?id=32819838 https://news.ycombinator.com/item?id=32819838 : > Wave Field recordings are probably [would probably be] the most complete known descriptions of the brain and its nonlinear fields?
- crowcroft 1y agoApple has clearly done a lot of work in this space and have decided to retain Touch ID on Macbooks. I think this is fairly instructive.