joint-statistics between reflected and transmitted speckle patterns : from mesoscopic correlations to information theory

Abstract : Clouds, milk, paper or biological tissues are called scattering media for light. Indeed when a plane wave encounters one a these media, the light is scattered and looses its preferential direction. Consequently, imaging through these media is more difficult than in homogeneous media. The existing methods rely on a CCD camera measuring the transmitted light. Nonetheless, the transmitted side of the sample is most of the time out of reach of the operator. In this thesis we interest ourselves to the link that exists between the reflected light and the transmitted light for thick scattering media. From a statistical point of view, this link is equivalent to the statistical dependency between the reflected light and the transmitted light. We show that the statistical dependency persists even for very thick media allowing us to propose new imaging modalities based on it. This statistical dependency between the reflected and the transmitted light is a very rich function of the parameters of the system, and may allow us to control the transmitted light using reflected information only.
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Nikos Fayard. joint-statistics between reflected and transmitted speckle patterns : from mesoscopic correlations to information theory. Physics [physics]. PSL Research University, 2017. English. ⟨NNT : 2017PSLET010⟩. ⟨tel-02310593⟩

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