Vision Enhancement in Bad Weather

Vision Enhancement in Bad Weather

Md. Imtiyaz Anwar (Dr. B. R. Ambedkar NIT Jalandhar, India) and Arun Khosla (Dr. B. R. Ambedkar NIT Jalandhar, India)
DOI: 10.4018/978-1-4666-8654-0.ch003
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Abstract

Road accident is a serious issue in most of the countries due to degraded visibility in bad weather such as fog, haze and rain. A better visibility is a key requirement for passenger's safety while maintaining the speed of the vehicle. Researchers throughout the world are focusing to enhance the visibility through bad weather mainly due to fog or haze to minimize accidents. Many efforts are being put up to clearly visualize the scene using computer vision. Classifications of fog and analysis of de-weathering techniques are prime motive of research. This book chapter addresses and summarizes the progress in the development of vision enhancement techniques for road safety in turbid medium, particularly with fog which greatly affects the vision. This chapter also presents a brief comparative analysis on different weather conditions and classification of fog which is important for application point of view.
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Bad Weather: Particles Around Us

From atmospheric point of view, weather conditions differ mainly in the types and sizes of the particles present and their concentrations in space around us. In general, the exact nature of scattering is highly complex and depends on the types, orientations, sizes, and distributions of particles constituting the media, as well as wavelengths, polarization states, and directions of the incident light (Mahadev & Henry, 2000). A great deal of effort has gone into measuring the size of these particles and concentrations for a variety of conditions with visibility (see Table 1). Given the small size of air molecules, relative to the wavelength of visible light, scattering due to air is rather minimal.

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