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A comment on Hide a photo inside another photo.

Re:Hide a photo inside another photo by mathewsanders on Friday April 29, 2022 @09:24AM (#31204755)
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?

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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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Re:Hide a photo inside another photo by teeray on Friday April 29, 2022 @10:41AM (#31205785)
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

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Re:Hide a photo inside another photo by peddling-brink on Friday April 29, 2022 @10:14AM (#31205393)
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-pap...

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