Can Shadows Reveal Biometric Information?. (arXiv:2209.10077v2 [cs.CV] UPDATED)

We study the problem of extracting biometric information of individuals by
looking at shadows of objects cast on diffuse surfaces. We show that the
biometric information leakage from shadows can be sufficient for reliable
identity inference under representative scenarios via a maximum likelihood
analysis. We then develop a learning-based method that demonstrates this
phenomenon in real settings, exploiting the subtle cues in the shadows that are
the source of the leakage without requiring any labeled real data. In
particular, our …

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