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A comment on Hide a photo inside another photo. Parent comment

Re:Hide a photo inside another photo by robotguy on Friday April 29, 2022 @11:31AM (#31206452)
Not specifically related, but something that provides about the same functionality and HN users might find interesting:

Bokode: Imperceptible Visual Tags for Camera Based Interaction from a Distance

https://www.researchgate.net/publication/215457339_Bokode_Im...

http://cameraculture.media.mit.edu/cubeportfolio/bokode/

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