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Would it be feasible to have a machine readable image like a QR code as the obscured image, so if people took a photo of a poster some metadata about the poster

Would it be feasible to have a machine readable image like a QR code as the obscured image, so if people took a photo of a poster some metadata about the poster could be exposed to the camera app to then be passed onto the user? Or does this technique rely on having access to the original digital image, and too much information is lost over the analog gap?

peddling-brink 4y ago
Maybe? Sounds like an interesting research project. This is mildly related: [PDF] Surmounting the Effects of Lossy Compression on Steganography https://csrc.nist.gov/csrc/media/publications/conference-paper/1996/10/22/proceedings-of-the-19th-nissc-1996/documents/paper014/stegox.pdf https://csrc.nist.gov/csrc/media/publications/conference-pap...
teeray 4y ago
You would need camera sensors that are sensitive to the minute changes in color this technique causes. Digital cameras use color filters [1] to capture that information, and these are more aligned with how the eye sees color. I’d imagine that would introduce the opportunity for losing what little information there is. [1] https://en.wikipedia.org/wiki/Bayer_filter https://en.wikipedia.org/wiki/Bayer_filter
robotguy 4y ago
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/