Half a croissant, on a plate, with a sign in front of it saying '50c'
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I like this idea, only I think it should be run by the government.

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QR Code Facial Recognition

 A likeness of oneself or other wall art quality image made of a QR code array.
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Reproduce a person's likeness in black and white or perhaps colorized wherein each pixel of the target image is a minute QR code chosen for its light or dark shade. With respect to size, an 8x10 inch high resolution photo would have about eight million pixels. Eight million QR codes would reference an extensive library of documents or other data.
—reensure, Oct 12 2018

QR code design from Wikipedia https://en.wikipedi...wiki/QR_code#Design
Mentioned in my anno [notexactly, Nov 01 2018]

Gigantic QR code https://en.wikipedi...:Qr-code-ver-40.png
Mentioned in my anno. Unfortunately, it's tiny, so I don't know if you'll be able to read it. [notexactly, Nov 01 2018]

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       Hmm. I have seen a site that will generate a working QR code, linking to the website of your choice, that looks like a picture of your choice.
—MaxwellBuchanan, Oct 12 2018
   

       My thought when I saw the idea title: yeah, facial recognition would be really easy if you got people to have a QR code on their faces.
—caspian, Oct 13 2018
   

       Well, just have the QR code tattooed on your face? It's a win-win, from some perspectives.   

       NB there is depressingly little info in a QR code,
—not_morrison_rm, Oct 13 2018
   

       have it shred itself when exposed to a camera.
—po, Oct 15 2018
   

       According to Wikipedia [link], QR codes use a "mask" that inverts some of the pixels specifically to break up visual patterns and make the pattern more uniformly dense. However, you've probably seen QR codes with images integrated into them—these take advantage of the error correction features of the QR code system. The image obscures some of the data that would be in the code, but the error correction is enough to reconstitute it. Therefore, you could probably just flip enough pixels to adjust the overall darkness of each QR code that forms a pixel of the larger image, and rely on error correction to keep them readable. (Error correction level is variable—some generators have a setting for it.)   

       // NB there is depressingly little info in a QR code, //   

       unless you use a gigantic QR code: [link]
—notexactly, Nov 01 2018
   


 

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