Ah ! here is something I like:
Speckle-learning-based object recognition through scattering media by Takamasa Ando, Ryoichi Horisaki, and Jun Tanida (pdf is here)
We experimentally demonstrated object recognition through scattering media based on direct machine learning of a number of speckle intensity images. In the experiments, speckle intensity images of amplitude or phase objects on a spatial light modulator between scattering plates were captured by a camera. We used the support vector machine for binary classification of the captured speckle intensity images of face and non-face data. The experimental results showed that speckles are sufficient for machine learning.
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