iPhone X Face ID mirror unlock

Discussion in 'iPhone' started by Pagemakers, Nov 9, 2017.

  1. Pagemakers macrumors 68020

    Pagemakers

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    Mar 28, 2008
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    #1
    I thought Face ID made a 3D scan of your face in order to unlock?

    If that’s the case why does mine unlock in the mirror?
     
  2. Diorama macrumors 6502a

    Joined:
    Oct 6, 2017
    #2
    Not this again.
    Do you look 3D in the mirror?
    Mirrors reflect light. Infra-red is light.
    It sees your face, not a flat plane.
     
  3. Newtons Apple macrumors Core

    Newtons Apple

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    #3

    Phone is still looking at your reflection, it is not looking at the flat mirror.
     
  4. Pagemakers thread starter macrumors 68020

    Pagemakers

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    #4
    Ah ok. Just tried with a full screen screenshot of my face on a large iPad Pro and it doesn’t unlock which is good.

    I thought it actually measures say the minute distance between various features on your face. Those distances in a mirror would all be the same single distance so that’s why I was surprised it unlocked.
     
  5. Diorama macrumors 6502a

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    Oct 6, 2017
    #5
    No, think about how it measures distance. It can’t “see” the mirror, it can only see you.
    As far as it is concerned there is no flat surface, just your real face in front of it.
    An iPad screen however is of course simply a flat surface.
     
  6. D.T. macrumors G3

    D.T.

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    #6

    They're not the same distance because they don't stop at the mirror, they reflect off the mirror and continue to the actual 3D surface of your face.
     
  7. Pagemakers thread starter macrumors 68020

    Pagemakers

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    #7
    Cheers guys (or ladies)!

    Makes sense I guess.
     
  8. Diorama macrumors 6502a

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    #8
    Yeah best way to imagine it is to point a laser pointer at your face through a mirror.
    The red dot should be on your face rather than on the glass itself.
     
  9. itsmemuffins macrumors 68040

    itsmemuffins

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    Jun 23, 2010
    #9
    Okay so I watched this video



    I’m thinking pretty much everything in it is BS.

    Then I tried to unlock my X by pointing it at my reflection in the mirror and it worked. Am I missing something here? How is it possible?
     
  10. jabingla2810 macrumors 68020

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    #10
    I think the bigger question is, why wouldn't it work in a mirror?
     
  11. ZEEN0j macrumors 65816

    ZEEN0j

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    #11
    I guess if you angle it so the ir dots hits your face (the mirror is reflective right). Then it would still be able to figure out the distance and create a 3D map.
     
  12. itsmemuffins macrumors 68040

    itsmemuffins

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    #12
    I thought it needs a 3D image?
    --- Post Merged, Nov 23, 2017 ---
    I had the phone facing the mirror directly. I suppose there could be a technical reason for it to work.
     
  13. BasicGreatGuy Contributor

    BasicGreatGuy

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    #13
    Stupid video created to generate click revenue.
     
  14. DeltaMac macrumors G3

    DeltaMac

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    #14
    Why would you think that a mirror reflection would NOT be 3D (and scan-able as such)?

    So, video is pointless, as that should work.
    Similar in principle to reading a bar scan label upside-down. The scanner cares little about the position, as long as the image is viewable.
     
  15. KingMD macrumors newbie

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    Austria
    #15
    And it gets it via the mirror. light gets reflected in both directions
     
  16. jabingla2810 macrumors 68020

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    Oct 15, 2008
    #16
    Face ID will scan your face as a 3D model through a mirror.

    Thats how light and reflections work.
     
  17. itsmemuffins macrumors 68040

    itsmemuffins

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    #17
    Okay but there is no depth in a mirror? Isn’t that why a photo doesn’t work?
     
  18. D.T. macrumors G3

    D.T.

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    #18
    Taking a break from the non-stop eating and drinking to answer this ... :D

    We’ve discussed this several times ... it is using a 3D source because it’s not scanning the image on the surface of the mirror it’s tracing the IR as it bounces off the mirror all the way to the reflected object.

    Think of it this way: If you shine a laser pointer at a mirror it doesn’t stop at the mirror, it bounces and continues till it strikes an object in 3D space and the path has different lengths depending on what part you shine it on in the mirror (ie, it retains depth)
     
  19. Givmeabrek macrumors 68040

    Givmeabrek

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    NY
    #19
    There is depth in the reflection. It's not like the image is painted on the mirror. The image in the mirror is 3 dimensional.
     
  20. itsmemuffins macrumors 68040

    itsmemuffins

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    #20
    Okay so nothings to see here move along?
     
  21. BasicGreatGuy Contributor

    BasicGreatGuy

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    #21
    Correct.
     
  22. myscrnnm macrumors 65816

    myscrnnm

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    Seattle, WA
    #22
    The phone is reading the infrared light reflected by the mirror, not the mirror itself. This is true of any surface.
     
  23. itsmemuffins macrumors 68040

    itsmemuffins

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    Jun 23, 2010
    #23
    Am I going mad or did my sad trombone and green sleeves video posts get deleted?:confused::eek::(
    --- Post Merged, Nov 23, 2017 ---
    Oh I see what’s happened. The threads have been merged.
     
  24. MrLoL macrumors 6502

    MrLoL

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  25. Amazing Iceman macrumors 68040

    Amazing Iceman

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    Florida, U.S.A.
    #25
    Old thread, but couldn't help myself after reading all the non-sense...

    It doesn't work because your face will be in reverse in the mirror. So if you have a mole on your left cheek, FaceID will detect it in the right cheek. The same will happen will all your facial features, hence, faceID will determine this is not the right face.

    Get it???
     

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31 November 9, 2017