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The scattering properties of a homogeneous elliptic cylinder with a dielectric or magnetic coating are investigated analytically. The method of separation of variables is used to determine, exactly, the field distributions in each region for the transverse electric (TE) excitation. The technique can be easily extended to handle any number of layers. The behavior of the scattered field in the far zone...
Fuel cell vehicles are currently undergoing extensive research and development due to their potential for low emissions and high efficiency. Fuel cells are rapidly appearing not only in on-road vehicles but also in off-road vehicles. Off-road vehicles require special geometrical and performance parameters to be able to work in different road conditions. Gradability is one of the most important parameters...
This paper addresses the problem of silhouette-based human action modeling and recognition, specially when the number of action samples is scarce. The first step of the proposed system is the 2D modeling of human actions based on motion templates, by means of motion history images (MHI). These templates are projected into a new subspace using the Kohonen self organizing feature map (SOM), which groups...
This paper addresses the problem of determining skin reflectance parameters, and studies their stability and discriminating power for different individuals. Our study uses radiance data captured by a Cyberware 3030 range scanner. We analyse the data using a layered reflectance model based on the Beckmann-Kirchhoff wave scattering model. The parameters of this model are the thickness of the skin layers,...
We propose a new method for human action recognition from video streams that is fast and robust to noise and to large changes in camera views. We start by extracting features in the Fourier domain once we obtain the bounding boxes containing the silhouettes of a human for a number of video frames representing a basic action. After preprocessing, we divide each space-time volume into space-time sub-volumes...
In this paper we introduce a large body of virtual human action silhouette (ViHASi) data that we have recently generated for the purpose of evaluating a family of action recognition methods. These are the silhouette-based human action recognition methods. This synthetic multi-camera video data-set consists of 20 action classes, 9 actors and up to 40 synchronized perspective cameras. This data-set...
A new model for the scattering of light from layered dielectrics with rough surface boundaries is introduced. The model contains a surface scattering component together with a subsurface scattering component. The former component corresponds to the roughness on the upper surface boundary and is modeled using the modified Beckmann model. The latter component accounts for both refraction due to Fresnel...
The radiation patterns of perturbed two dimensional parabolic reflector fed by a slotted circular cylindrical waveguide for both the TE and the TM modes are examined. The analysis is carried out using Green's function second identity in conjunction with the Moment Method. Results show that the perturbed geometry achieves various degrees of improvements in most antenna's characteristics over the plain...
A new model for the scattering of light from layered surfaces with boundaries of variable roughness is introduced. The model contains a surface scattering component together with a subsurface scattering component. The former component corresponds to the roughness on the upper surface boundary and is modeled using the modified Beckmann model. The latter component accounts for both refraction due to...
Hurd's Wiener-Hopf solution for the input admittance of long dipoles is extended to the general case when the antenna is multiply fed and multiply loaded. Accurate expressions are thus derived for the radiation pattern, current distribution and input admittance of the arbitrarily fed and multiply loaded dipole antenna. Comparison with numerical methods as well as available experimental is presented...
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