Non-invasive imaging of object behind strongly scattering media via cross-spectrum

TL;DR

This paper presents a non-invasive imaging technique that uses the cross-spectrum of an intensity-modulated laser to detect and image objects hidden behind strongly scattering media, effective even in noisy environments.

Contribution

The authors introduce a novel cross-spectrum based method for imaging through turbid media, with theoretical analysis and experimental validation demonstrating its effectiveness.

Findings

Successfully images objects behind diffusers

Effective in noisy and dynamic environments

Non-invasive and easy to implement

Abstract

We develop a method based on the cross-spectrum of an intensity-modulated CW laser, which can extract a signal from an extremely noisy environment and image objects hidden in turbid media. We theoretically analyzed our scheme and performed the experiment by scanning the object placed in between two ground glass diffusers. The image of the object is retrieved by collecting the amplitudes at the modulation frequency of all the cross-spectra. Our method is non-invasive, easy-to-implement, and can work for both static and dynamic media.