Imaging through fog using quadrature lock-in discrimination
Image and Video Processing
2021-05-19 v1
Abstract
We report experiments conducted in the field in the presence of fog, that were aimed at imaging under poor visibility. By means of intensity modulation at the source and two-dimensional quadrature lock-in detection by software at the receiver, a significant enhancement of the contrast-to-noise ratio was achieved in the imaging of beacons over hectometric distances. Further by illuminating the field of view with a modulated source, the technique helped reveal objects that were earlier obscured due to multiple scattering of light. This method, thus, holds promise of aiding in various forms of navigation under poor visibility due to fog.
Cite
@article{arxiv.2105.08524,
title = {Imaging through fog using quadrature lock-in discrimination},
author = {Shashank Kumar and Bapan Debnath and Meena M. S. and Julien Fade and Sankar Dhar and Mehdi Alouini and Fabien Bretenaker and Hema Ramachandran},
journal= {arXiv preprint arXiv:2105.08524},
year = {2021}
}