Imaging through fog and rain

Luc R. Bissonnette

doi:10.1117/12.56145

1 May 1992 Imaging through fog and rain

Luc R. Bissonnette

Author Affiliations +

Optical Engineering, Vol. 31, Issue 5, (May 1992). https://doi.org/10.1117/12.56145

Abstract

The main aerosol effect on imaging performance is brightness reduction through scattering losses. This is fairly well understood and modeled. However, one phenomenon that is almost always overlooked is the blurring of images that can result from forward-scattered radiation, i.e., the radiation reaching the image plane after being scattered by airborne particles. The paper describes a new and efficient method of calculation of the forward-scattering effect on the point spread and modulation transfer functions. Solutions are presented that show the dependence of the aerosol blurring effect on particle concentration, particle size, geometry, and size of object features. The paper also reports on a simple experiment for measuring the visible point spread function through fog and rain. In most cases, the measurements are in good agreement with the model predictions. As it turns out, our measurements performed at ranges of 500 and 900 m and optical depths of up to seven show significant aerosol blurring effects only for rain and for some advection fogs with a sufficient number of particles in the size range of about 100 μm.

Citation Download Citation

Luc R. Bissonnette "Imaging through fog and rain," Optical Engineering 31(5), (1 May 1992). https://doi.org/10.1117/12.56145

Published: 1 May 1992

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available