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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Jon Kline‏ @JonKline Mar 24
      Replying to @SwiftOnSecurity

      Autoexposure is pretty amazing but modern AE like on an iPhone requires a ton of processing. The camera needs to know what it's looking at before it can adjust to what it's seeing. And those algorithms look for faces. Chances are, at night the camera is just at max sensitivity.

      2 replies 0 retweets 12 likes
    2. Jon Kline‏ @JonKline Mar 24
      Replying to @JonKline @SwiftOnSecurity

      A consumer camera can use a long shutter at night and get better exposure. But the data would be worthless because it would be blurry. I would guess that camera was working at least 60fps, and probably 1/120 shutter.

      1 reply 0 retweets 11 likes
    3. SwiftOnSecurity‏ @SwiftOnSecurity Mar 24
      Replying to @JonKline

      Can you explain more, if there’s more to say? I appreciate your expert comment.

      3 replies 0 retweets 6 likes
    4. Jon Kline‏ @JonKline Mar 24
      Replying to @SwiftOnSecurity

      Your iPhone uses maybe 1/30 of a second of light for each frame. The Uber camera is definitely using less. Likely a quarter of that. This makes motion much crisper looking, good for computers that want to process and understand that data.

      4 replies 2 retweets 22 likes
    5. Rich Felker‏ @RichFelker Mar 24
      Replying to @JonKline @SwiftOnSecurity

      FWIW 1/30s exposure makes for awful blurred pics/video, but for some reason giving us an option to fix that on our phones would be "too confusing". Uhg.

      1 reply 0 retweets 1 like
    6. Rich Felker‏ @RichFelker Mar 24
      Replying to @RichFelker @JonKline @SwiftOnSecurity

      I so want a camera config switch for "never use exposure longer than 1/120s no matter what, emulate 'ISO 25600' if needed".

      1 reply 0 retweets 2 likes
    7. Jon Kline‏ @JonKline Mar 24
      Replying to @RichFelker @SwiftOnSecurity

      Sony, definitely. An A7s II can expose by moonlight and look like a sunny day.

      1 reply 0 retweets 1 like
    8. Rich Felker‏ @RichFelker Mar 24
      Replying to @JonKline @SwiftOnSecurity

      I mean on Android and iOS camera apps. :-)

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker Mar 24
      Replying to @RichFelker @JonKline @SwiftOnSecurity

      I really don't care if the result is effectively 1bpp and half noise; it's better than nothing but smears.

      8:42 PM - 24 Mar 2018
      0 replies 0 retweets 0 likes

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