Development of system for measuring visibility along the free space optical link using digital camera

Brazda, Vladimir; Fišer, Ondřej; Rejfek, Lubos

doi:10.1109/radioelek.2014.6828458

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…The results of the optical system are closed to the ones obtained with the professional sensors. The work continues in [ 70 , 71 ], which present a link between attenuation caused by fog and visibility (definition from CIE): β = 3.91/V [km^(−1)], where β is the attenuation, V is visibility, the relation being valid for the wavelength λ = 550 nm. Comparison between the above-mentioned optical measurements and other methods are presented in the next subsection.…”

Section: Fog Detection and Visibility Estimation Methodsmentioning

confidence: 99%

Section: Optical Power: Direct Transmission Measurementmentioning

confidence: 99%

“…The results presented in the paper are only preliminary ones, which prove that the process flow is working (data acquisition, transmission, and processing) but there are no results in different weather conditions (no fog, fog, dense fog) presented in the paper to prove the functionality of the system. A method of estimating fog density based on the free space optical link attenuation is presented in [69] and continued in [70] by using standard meteorological equipment. Brazda et al present a visibility meter composed of a camera and black and white targets used to measure the contrast.…”

Section: External Sensors and Systemsmentioning

confidence: 99%

“…A method of estimating fog density based on the free space optical link attenuation is presented in [ 69 ] and continued in [ 70 ] by using standard meteorological equipment. Brazda et al present a visibility meter composed of a camera and black and white targets used to measure the contrast.…”

Section: Sensors and Systems For Fog Detection And Visibility Enhancementmentioning

confidence: 99%

“…In [ 70 ], the method already tackled in Section 4.2 is presented in a system where optical power measurement was combined with contrast variation. The results presented there (see Section 4.2 ) confirm the theory that the decrease, in contrast, is the main fog effect on visual perception.…”

Section: Reaction Of Human Subjectsmentioning

confidence: 99%

See 4 more Smart Citations

Visibility Enhancement and Fog Detection: Solutions Presented in Recent Scientific Papers with Potential for Application to Mobile Systems

Miclea

Ungureanu

Sandru

et al. 2021

Sensors

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In mobile systems, fog, rain, snow, haze, and sun glare are natural phenomena that can be very dangerous for drivers. In addition to the visibility problem, the driver must face also the choice of speed while driving. The main effects of fog are a decrease in contrast and a fade of color. Rain and snow cause also high perturbation for the driver while glare caused by the sun or by other traffic participants can be very dangerous even for a short period. In the field of autonomous vehicles, visibility is of the utmost importance. To solve this problem, different researchers have approached and offered varied solutions and methods. It is useful to focus on what has been presented in the scientific literature over the past ten years relative to these concerns. This synthesis and technological evolution in the field of sensors, in the field of communications, in data processing, can be the basis of new possibilities for approaching the problems. This paper summarizes the methods and systems found and considered relevant, which estimate or even improve visibility in adverse weather conditions. Searching in the scientific literature, in the last few years, for the preoccupations of the researchers for avoiding the problems of the mobile systems caused by the environmental factors, we found that the fog phenomenon is the most dangerous. Our focus is on the fog phenomenon, and here, we present published research about methods based on image processing, optical power measurement, systems of sensors, etc.

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Section: Fog Detection and Visibility Estimation Methodsmentioning

confidence: 99%

Section: Optical Power: Direct Transmission Measurementmentioning

confidence: 99%