Wavelet Transform for Visibility Analysis in Fog Situations
نویسندگان
چکیده
In this article a new technique for the estimation of the distance of visibility in fog conditions is presented. It is based on a psychovisual model and on contrast estimation with wavelet transform. For this application, specific B–spline wavelets are introduced in order to have a good space and frequency localization and to enable a fast implementation. Using images stemming from situations on motorways, this technique is compared to a direct local contrast calculation.
منابع مشابه
Wavelet Transform for Analyzing Fog Visibility
A GROWING NUMBER OF COMputer-vision systems have emerged for traffic analysis and control. Increased traffic, along with steady efforts to improve driver security, have encouraged the development of sophisticated video-based systems, providing statistical measures of traffic flow for actual traffic information on variable message signs. Investigations show that VMS reduce traffic jams, thus min...
متن کاملFpga Based Fiber Optic Gyroscope Signal Denoising Using Discrete Wavelet Transform
This paper presents field programmable gate array (FPGA) implementation of the forward/inverse discrete wavelet transform for denoising Fiber Optic Gyroscope (FOG) signal. In this work an extensive study on the effect of different threshold techniques of DWT algorithm are carried out denoising the FOG signal. Different architectures such as multiply and accumulate (MAC), Distributed Arithmetic ...
متن کاملTowards Real-Time Detection of Freezing of Gait Using Wavelet Transform on Wireless Accelerometer Data
Injuries associated with fall incidences continue to pose a significant burden to persons with Parkinson's disease (PD) both in terms of human suffering and economic loss. Freezing of gait (FOG), which is one of the symptoms of PD, is a common cause of falls in this population. Although a significant amount of work has been performed to characterize/detect FOG using both qualitative and quantit...
متن کاملModeling and rendering heterogeneous fog in real-time using B-Spline wavelets
Heterogeneous fogs are often modeled with several layers of different density or using particle systems. However, layers are limited to vertical variations and using particles can involve long computation time with large outdoor scenes. In this article we present a simple method to render heterogeneous fog in real-time. The extinction function of our fog, related to its density, is first modele...
متن کاملA Total Bounded Variation Approach to Low Visibility Estimation on Expressways
Low visibility on expressways caused by heavy fog and haze is a main reason for traffic accidents. Real-time estimation of atmospheric visibility is an effective way to reduce traffic accident rates. With the development of computer technology, estimating atmospheric visibility via computer vision becomes a research focus. However, the estimation accuracy should be enhanced since fog and haze a...
متن کامل