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AI Generated QR Codes with Stable Diffusion and ControlNet
(reticulated.net)
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this post was submitted on 06 Oct 2023
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It's kinda funny that once we developed this form of communication specifically safe from errors, we went to abuse it's cool anti-error design to put logos in a center of it: basically, these are obstructions not big enough to hurt reading capabilities too much. And now we push it even further to see if it still works while looking nothing like it.
not me. I use a version (qr code size) too big for my data, then generate specific padding in order to manipulate the ecc data to look like a picture.
given a block of data with n bytes of data and m ecc bytes, it can be decomposed into separate blocks each with only one set bit in the data section. Any data +ecc block can be made with a bunch of these vectors xored together. XOR is both the addition/subtraction operator in the galois field (mod 2). So you can decompose your original message, and then xor hovever many single-data-bit vectors to manipulate the pattern as you want, provided that the data bit corresponds to padding. your message won't be corrupted, but you can get some degree of control over padding/ecc data.
I feel like I lack IQ to understand that. Do you have some learning materials at hand to explain it?
They are talking about a creative way to manipulate QR codes so they can have a custom design, like an image or logo, without corrupting the data they contain.
QR codes come in different sizes. By choosing a size larger than necessary for their data, there is extra space left over, called "padding." "ECC" stands for Error Correction Code. QR codes have built-in error correction which allows them to be read even if they're damaged or partially obscured. They are suggesting they can manipulate this ECC data, along with the padding, to make the QR code look a certain way, like having a picture in it. Think of a QR code's data as a collection of tiny boxes, each box being a "bit" that can be either on (1) or off (0). They are talking about breaking down this data into separate groups where only one box is turned on in each group. Without diving deep into mathematics, XOR is a simple way to combine two sets of data (exclusive or). It's a fundamental operation in digital electronics and math. In this context, it's used to mix the original QR code data with the custom design data. By using the XOR operation, they can combine the original QR code data with their custom design data without corrupting the original message. So as long as they're only manipulating the extra space (padding) and not the original data, the QR code's message remains intact.
TL;DR: They found a way to add custom designs to QR codes without messing up the information they contain. They do this by manipulating the extra space and error correction data in larger QR codes. It's a bit like doodling in the margins of a notebook page without writing over the original notes.
I originally learned the technique from here
Tanks. I'l give it a read.