Quantum defogging: temporal photon number fluctuation correlation in time-variant fog scattering medium

TL;DR

This paper introduces a novel photon fluctuation correlation method that effectively defogs images in time-variant fog conditions by leveraging the scattering photons' stable correlation, surpassing traditional models.

Contribution

It extends the McCartney model to include time-variance, demonstrating that scattering photons maintain stable correlations useful for defogging in dynamic fog environments.

Findings

Photon fluctuation correlation distinguishes scattering from ambient photons.

The method reconstructs clear images from foggy conditions where traditional cameras fail.

Time-variant fog noise is inherently eliminated through the proposed correlation approach.

Abstract

The conventional McCartney model simplifies fog as a scattering medium with space-time invariance, as the time-variant nature of fog is a pure noise for classical optical imaging. In this letter, an opposite finding to traditional idea is reported. The time parameter is incorporated into the McCartney model to account for photon number fluctuation introduced by time-variant fog. We demonstrated that the randomness of ambient photons in the time domain results in the absence of a stable correlation, while the scattering photons are the opposite. This difference can be measured by photon number fluctuation correlation when two conditions are met. A defogging image is reconstructed from the target's information carried by scattering light. Thus, the noise introduced by time-variant fog is eliminated by itself. Distinguishable images can be obtained even when the target is indistinguishable by conventional cameras, providing a prerequisite for subsequent high-level computer vision tasks.