3 ms·

Most obviously, the system should not tolerate a constant-size pupil, ever. The pupil has micro-dilations around twice per second, and your system is really ter

Most obviously, the system should not tolerate a constant-size pupil, ever. The pupil has micro-dilations around twice per second, and your system is really terrible if you don't verify that changing diameter. What if one of the subject's eyes is a glass eye? What if they're wearing colored contact lenses? Wouldn't both of those situations complicate that?

wlesieutre 9y ago
If someone's wearing a colored contact lens I would expect iris recognition to not work. That's like trying to use a fingerprint reader with gloves on.
- wlesieutre 9y ago
  Glass eye I'm not sure about either. That seems along the lines of using a fingerprint reader on a prosthetic hand. Sure, you could mold a fingerprint onto one and scan it, but with a sophisticated fingerprint sensor it's going to look like a fake finger. Do we deliberately make everyone's fingerprint scanner weak to allow someone without fingers to use it? Maybe the answer is to introduce a "weak mode" option where most users could have the scanner verify "yes, this is a real eyeball," and if someone with a glass eye still wanted to use iris scanning in a way that can be copied by a photo, they have the choice to disable the security measures.
  - tboughen 9y ago
    If someone with a glass eye is using a smartphone then one would suspect they are seeing their other, real, eye. This can then be scanned as normal.
    - wlesieutre 9y ago
      You'd think so, but iPhones are incredibly useful to blind people. https://finance.yahoo.com/news/david-pogue-on-iphone-voiceover-163733668.html https://finance.yahoo.com/news/david-pogue-on-iphone-voiceov...
      - eric_h 9y ago
        The first time I saw a blind person using an iPhone on the subway (years ago, I think it was an iPhone 4), I was completely blown away at how much he could do with it. Personally I think apple should allow you to turn the backlight for the screen off entirely for their use. Perfect over the shoulder privacy and better battery life to boot!
        jonchang 9y ago
        It's called "Screen Curtain" and it's been around for a long time.

wlesieutre 9y ago

If someone's wearing a colored contact lens I would expect iris recognition to not work. That's like trying to use a fingerprint reader with gloves on.

wlesieutre 9y ago
Glass eye I'm not sure about either. That seems along the lines of using a fingerprint reader on a prosthetic hand. Sure, you could mold a fingerprint onto one and scan it, but with a sophisticated fingerprint sensor it's going to look like a fake finger. Do we deliberately make everyone's fingerprint scanner weak to allow someone without fingers to use it? Maybe the answer is to introduce a "weak mode" option where most users could have the scanner verify "yes, this is a real eyeball," and if someone with a glass eye still wanted to use iris scanning in a way that can be copied by a photo, they have the choice to disable the security measures.
- tboughen 9y ago
  If someone with a glass eye is using a smartphone then one would suspect they are seeing their other, real, eye. This can then be scanned as normal.
  - wlesieutre 9y ago
    You'd think so, but iPhones are incredibly useful to blind people. https://finance.yahoo.com/news/david-pogue-on-iphone-voiceover-163733668.html https://finance.yahoo.com/news/david-pogue-on-iphone-voiceov...
    - eric_h 9y ago
      The first time I saw a blind person using an iPhone on the subway (years ago, I think it was an iPhone 4), I was completely blown away at how much he could do with it. Personally I think apple should allow you to turn the backlight for the screen off entirely for their use. Perfect over the shoulder privacy and better battery life to boot!
      - jonchang 9y ago
        It's called "Screen Curtain" and it's been around for a long time.