You Can run But you Can't hide...

Discussion in 'Off-Topic' started by MaxHeadRoom, Oct 8, 2015.

  1. MaxHeadRoom

    Thread Starter Expert

    Jul 18, 2013
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    Think you can get lost in the crowd?
    Not anymore


    This photo was taken in Canada and shows about 700,000 people.

    Pick on a small part of the crowd click a couple of times -- wait -- click a few more times and see how clear each individual face willbecome each time. Or use the wheel on your mouse.

    This picture was taken with a 70,000 x 30,000 pixel camera (2100 Mega Pixels.) These cameras are not sold to the public and are being installed in strategic locations.

    http://www.gigapixel.com/mobile/?id=79995
     
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  2. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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    They can 'see' you but can they recognize you in the sea of data generated from these systems. If you understand the algorithms used it's possible to avoid computer vision auto face recognition. If a computer scans the camera image it doesn't see the small section of the large image containing each person as a face.

    http://cvdazzle.com/
    http://www.computervisiononline.com/blog/creating-art-while-challenging-face-recognition-algorithms
    http://rstb.royalsocietypublishing.org/content/royptb/364/1516/529.full.pdf
     
  3. wayneh

    Expert

    Sep 9, 2010
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    Oh c'mon. That could be fixed with a couple lines of code and some processing power. If they want to recognize you, they will.
     
  4. wayneh

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    I saw a similar photo taken at the Blackhawks game where they won the Stanley Cup. Almost everyone in the arena was identifiable. It's a brilliant way to sell pictures. One shot, thousands of potential customers.

    I noticed there are a quite a few artifacts in that photo, two-headed people and such.
     
    Last edited: Oct 8, 2015
  5. nsaspook

    AAC Fanatic!

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    We both know that computers only do what we program. Programming face recognition in non-perfect conditions is a lot more than a couple lines of code. There is a lot of science being devoted to digital camouflage and systems like CVDAZZLE are just the first stage.
     
  6. wayneh

    Expert

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    Ah, but the majority of those people are not hiding and the photo contains plenty of resolution to identify most of them. Picking out the one guy that's hiding in plain sight, yeah that could be very difficult.
     
  7. nsaspook

    AAC Fanatic!

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    That is a weakness of using mass CV systems to find people who don't want to be 'seen' easily exploit. The point is to ID the person(s) in a large group of people if you need to find someone. These systems generate massive amounts of video or image data that can only be really useful with automated systems to reduce the massive amount of random blocks of image data to faces and then to a subset of similar faces for the humans to match as they are much better than any current machine. The key is to know the weakness in those systems to keep the image from the human operator in the first place and it's not really that hard to do.

    Most modern image CV systems now use some version of sparse encoding that's similar once the system thinks it has a face.
    http://www.cmlab.csie.ntu.edu.tw/~yanying/paper/msp022-chen.pdf
     
    Last edited: Oct 8, 2015
  8. strantor

    AAC Fanatic!

    Oct 3, 2010
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    Facial recognition won't get me!, Not with my tin foil hat on!
    (it's a tin foil spartan helmet)
     
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  9. nsaspook

    AAC Fanatic!

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    Facial recognition won't get you but the men in white suits will.

     
  10. nerdegutta

    Moderator

    Dec 15, 2009
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    Did anyone find Waldo?
     
  11. atferrari

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    Waldo no but I finally found Carmen Sandiego! !:p:D
     
  12. ErnieM

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    Apr 24, 2011
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    Where in the world was Carmen Sandiego?
     
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