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So you say it's Hacker News here... Okay, have you ever heard of steganography? And are you sure your camera isn't covertly embedding something into image data
by drdaeman 16y ago
So you say it's Hacker News here... Okay, have you ever heard of steganography? And are you sure your camera isn't covertly embedding something into image data (not metadata), like printers do with yellow dots?
And there are a lot of different watermarking algorithms, some of which are capable of surviving basic image operations, like resizing or color balance adjustment.
- palish 16y agoCould you provide reference links for what you're talking about? It seems like very interesting reading.
- Create 16y agoAs all detector arrays, digital sensors have a fingerprint/signature/profile [however you look at it] that can affect noise/(d)efficiency/colour etc. This used to be all too apparent, even Kodak digital cameras had a correction-filter file calibrated for each camera to adjust white balance etc. that came with the camera.
- drdaeman 16y agoThere's a known legit (non-covert) use of digital watermarking in Epson PhotoPC 3000Z and the Kodak DC-290: http://en.wikipedia.org/wiki/Digital_watermarking#Secure_digital_camera http://en.wikipedia.org/wiki/Digital_watermarking#Secure_dig... I don't know about covert embedding, but as it's possible, I won't be surprised if it really exists.