Not specifically related, but something that provides about the same functionality and HN users might find interesting: Bokode: Imperceptible Visual Tags for C

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