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Camera device identification<br />
◮ most probably, one single feature can distinguish between specific camera devices<br />
Camera ID from sensor noise [Lukáˇs et al., 2005, 2006]<br />
◮ CCD / CMOS sensor elements convert light into a digital signal, a process subject to<br />
various noise sources<br />
⊲ temporal noise: varies throughout all images from a camera<br />
⊲ spatial noise: similar for all images of the very same camera,<br />
but different between distinct devices<br />
fixed pattern<br />
noise (FPN)<br />
⊲ additive noise, mainly due<br />
to dark noise<br />
⊲ flattened inside camera<br />
photo-response<br />
non-uniformity (PRNU)<br />
⊲ multiplicative noise, due to varying<br />
light-sensitivity of sensor elements<br />
⊲ hard to correct in cameras<br />
Gloe & Kirchner Digital Image Forensics slide 24