Harnessing Optical Imaging Limit through Atmospheric Scattering Media

TL;DR

The paper addresses the fundamental limit of optical imaging through atmospheric scattering media by proposing a MOR-based, MTF-centric framework that couples target modulation, atmospheric effects, optics, processing, and perception via a perceptibility parameter $k$. The core approach decomposes the system MTF as $MTF_{sys}=MTF_AMTF_LMTF_S$ and imposes the perceptibility condition $m_d^{img}\ge\max\{k\,m_d^{noise},1/\Gamma\}$ to derive angular-resolution limits and attenuation thresholds $\tau$. Experimental validation is performed in a fog chamber and outdoor settings, showing good agreement with theory and demonstrating that multi-frame averaging can extend the perceptible range by about 1.2× while reducing the effective $k$ (to ~0.184), highlighting practical strategies for system design and post-processing. The work provides quantitative guidance for optimizing optical systems, dehazing algorithms, and high-dynamic-range sensing to harness the physical limit of imaging in scattering media.

Abstract

Recording and identifying faint objects through atmospheric scattering media by an optical system are fundamentally interesting and technologically important. In this work, we introduce a comprehensive model that incorporates contributions from target characteristics, atmospheric effects, imaging system, digital processing, and visual perception to assess the ultimate perceptible limit of geometrical imaging, specifically the angular resolution at the boundary of visible distance. The model allows to reevaluate the effectiveness of conventional imaging recording, processing, and perception and to analyze the limiting factors that constrain image recognition capabilities in atmospheric media. The simulations were compared with the experimental results measured in a fog chamber and outdoor settings. The results reveal general good agreement between analysis and experimental, pointing out the way to harnessing the physical limit for optical imaging in scattering media. An immediate application of the study is the extension of the image range by an amount of 1.2 times with noise reduction via multi-frame averaging, hence greatly enhancing the capability of optical imaging in the atmosphere.

Figures (6)

• Figure 1: Schematic of the optical imaging process through atmospheric scattering media under external illumination.
• Figure 2: Original Data from fog chamber experiment. Targets in (a) high and (b) low visibility conditions, along with the average normalized values for the red region in (c) high and (d) low visibility, and the blue region in (e) high and (f) low visibility.
• Figure 3: Relationship between AR and $\tau$, Prediction versus Data, (a) MER-232-48-GM-P NIR and (b) PCO EDGE 4.2.
• Figure 4: Relationship between number of averaging and (a) image variance and (b) SNR.
• Figure 5: Relationship between AR and $\tau$ in field experiment.