[vmirnv]

I'm thinking — is it possible to create something on a global level similar to what they did in Snapchat: some sort of image flickering that would be difficult to parse, but still acceptable for humans?

[nihilius]

Sorry i do not use Snapchat and with googeling "Snapchat image flickering" i did not find a good result. Could you elaborate this a bit more or provide me with a link where this is described? Thank you very much. :)

[int_19h]

If humans can process it, you can train a model to do the same.