Image Enhancement of FOG-Impaired Scenes with Variable Visibility

Enhancement of images of foggy scenes is being investigated for application to navigational aids. Approaches based on atmospheric scatter models have previously been developed. In most cases, the assumption is made of uniform aerosol suspension leading to models of constant attenuation per unit distance. The paper addresses situations where such an assumption is not valid and proposes an approach for image enhancement when visibility varies with direction. The basis for the development of the approach is provided along with an example of application.