Dave Richeson on Nostr: Yesterday at the MoMath MOVES conference, Erik Demaine discussed QR codes and showed ...

Yesterday at the MoMath MOVES conference, Erik Demaine discussed QR codes and showed examples of how to incorporate images into them so they are still scannable. I had to give it a try. This QR code should take you to my website.

More details: The second image is the QR code I started with (I used this page to create it https://www.nayuki.io/page/qr-code-generator-library). Certain "finder patterns" must be in the code—the nested squares and a row and column of alternating pixels. The rest are black and white pixels encoding the text. But for these, all that matters is whether the center of the pixel is black or white. So, if you shrink the black and white pixels by a factor of three, say, you can use the rest of the area however you want. I used Photoshop to turn my profile photo into a black-and-white pixellated image of the correct size. Then, I placed the QR code on top of it.