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there's a mask process in qr code generation. the masks aims to try to make it look like uniform noise, so you don't end up with blocks/lines of pure white or pure black. so you won't end up with any recognizable symbol in the usual algorithmic generation
some more detail: it will use one of these patterns to invert some pixels until it finds one that results in more or less uniform noise.
it will also add a set of pixels in a designated mask identification zone that instructs the decoder which mask was used
It is designed to especially penalize ⬜⬛⬜⬛⬛⬛⬜, which is a part of the finder pattern (big squares in the corners) and the swastika.
Ah OK, I guess the lines part was what I was missing. I guess without any straight lines the probability of something like that containing something offensive drops pretty low.
that's really neat, but also disappointing i can't like draw a duck in the qr and somehow make it work.
you can if it's small and in the middle