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Yepes Julia, C. (author), Gandini, Erio (author), Monni, Stefania (author), Van Vliet, Frank E. (author), Neto, A. (author), Cavallo, D. (author)In this work, antenna arrays with tilted dipoles are investigated in terms of radiation and impedance properties. A spectral method of moments (MoM) was developed for the analysis of doubly-periodic arrays (i.e. periodic in both x and ydirections)<br/>with arbitrarily tilted dipole elements, in free space or in the presence of a backing...conference paper 2019
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Yepes Julia, C. (author), Neto, A. (author), Cavallo, D. (author), Gandini, E (author), Van Vliet, Frank E. (author), Monni, Stefania (author)We present the design of an array of tilted dipoles loaded with artificial dielectrics, to achieve asymmetric radiation patterns. First, a simplified array element consisting of skewed stacked dipoles in the presence of a backing reflector is studied, by means of a dedicated spectral periodic method of moments (MoM). The analysis of the stacked...conference paper 2019
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Li, Z. (author), Van Vliet, L.J. (author), Stoker, J. (author), Vos, F.M. (author)Image registration of medical images in the presence of large intra-image signal fluctuations is a challenging task. Our paper addresses this problem by introducing a new concept based on the structure tensor of the local phase. The local phase is calculated from the monogenic signal representation of the images. The local phase image is hardly...conference paper 2015
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Erkens, S.M.J.G. (author), Van Vliet, D. (author), Stigter, J. (author), Mookhoek, S.D. (author), Sluer, B. (author), Khedoe, R. (author), Van de Wall, A. (author), De Bondt, A.H. (author)In 2008 Europe introduced the CEN standards for Asphalt Concrete. The Netherlands adopted the approach of functional requirements, rather than empirical, recipe based requirement. The experiences since 2008 showed that, although this approach allows for a better, more fundamental understanding of Asphalt Concrete, the current understanding is...conference paper 2015
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Shakeri, S.M. (author), Hulsken, B. (author), Van Vliet, L.J. (author), Stallinga, S. (author)Whole Slide Imaging (WSI) systems are used in the emerging field of digital pathology for capturing high-resolution images of tissue slides at high throughput. We present a technique to measure the optical aberrations of WSI systems using a Shack-Hartmann wavefront sensor as a function of field position. The resulting full-field aberration maps...conference paper 2015
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Letema, S. (author), Van Vliet, B. (author), Van Lier, J.B. (author)Urbanisation of poverty and informality in East Africa poses a threat to public health and environmental protection, perpetuating social exclusion and inequalities, while it creates service gaps. Neither conventional on-site sanitation nor modern centralised off-site sanitation provisions are tenable citywide, giving rise to the emergence of...conference paper 2012
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Van Vliet, B. (author), Caarls, W. (author), Schuitema, E. (author), Jonker, P.P. (author)Reinforcement learning is a way to learn control tasks by trial and error. Even for simple motor control tasks, however, this can take a long time. We can speed up learning by using prior knowledge, but this is not always available, especially for an autonomous agent. One way to add limited prior knowledge is to use subgoals, defining points...conference paper 2011
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Kostenko, A. (author), Sharma, H. (author), Gözde Dere, E. (author), King, A. (author), Ludwig, W. (author), Van Oel, W. (author), Offerman, S.E. (author), Stallinga, S. (author), Van Vliet, L.J. (author)This work presents the development of a non-destructive imaging technique for the investigation of the microstructure of cementite grains embedded in a ferrite matrix of medium-carbon steel. The measurements were carried out at the material science beamline of the European Synchrotron Radiation Facility (ESRF) ID11. It was shown that in-line X...conference paper 2011
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Tang, H. (author), Van Walsum, T. (author), Van Onkelen, R.S. (author), Klein, S. (author), Hameeteman, R. (author), Schaap, M. (author), Van den Bouwhuijsen, Q. (author), Witteman, J.C.M. (author), Van der Lugt, A. (author), Van Vliet, L.J. (author), Niessen, W.J. (author)We propose a minimum cost path approach to track the centerlines of the internal and external carotid arteries in multispectral MR data. User interaction is limited to the annotation of three seed points. The cost image is based on both a measure of vessel medialness and lumen intensity similarity in two MRA image sequences: Black Blood MRA and...conference paper 2011
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Barends, R. (author), Van Vliet, S. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Klapwijk, T.M. (author)We present measurements of the quasiparticle relaxation time in Ta superconducting films shaped as planar resonators using the response of the complex conductivity to photon flux. These films have been implanted with magnetic (Mn) as well as non-magnetic atoms (Al). We find a significant decrease of the relaxation time with increasing impurity...conference paper 2009
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Dijk, J. (author), Van Eekeren, A.W.M. (author), Schutte, K. (author), De Lange, D.J.J. (author), Van Vliet, L.J. (author)When bright moving objects are viewed with an electro-optical system at very long range, they will appear as small slightly blurred moving points in the recorded image sequence. Detection of point targets is seriously hampered by structure in the background, temporal noise and aliasing artifacts due to undersampling by the infrared (IR) sensor....conference paper 2009
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Pham, T.Q. (author), Van Vliet, L.J. (author), Schutte, K. (author)This paper proposes an example-based Super-Resolution (SR) algorithm of compressed videos in the Discrete Cosine Transform (DCT) domain. Input to the system is a Low-Resolution (LR) compressed video together with a High-Resolution (HR) still image of similar content. Using a training set of corresponding LR-HR pairs of image patches from the HR...conference paper 2006
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Pham, T.Q. (author), Bezuijen, M. (author), Van Vliet, L.J. (author), Schutte, K. (author), Luengo Hendriks, C.L. (author)This paper derives a theoretical limit for image registration and presents an iterative estimator that achieves the limit. The variance of any parametric registration is bounded by the Cramer-Rao bound (CRB). This bound is signal-dependent and is proportional to the variance of input noise. Since most available registration techniques are biased...conference paper 2005
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Pham, T.Q. (author), Van Vliet, L. (author), Schutte, K. (author)This paper presents a method to predict the limit of possible resolution enhancement given a sequence of lowresolution images. Three important parameters influence the outcome of this limit: the total Point Spread Function (PSF), the Signal-to-Noise Ratio (SNR) and the number of input images. Although a large number of input images captured by a...conference paper 2005
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Garini, Y. (author), Kutchoukov, V.G. (author), Bossche, A. (author), Alkemade, P.F.A. (author), Docter, M.W. (author), Verbeek, P.W. (author), Van Vliet, L.J. (author), Young, I.T. (author)Recently, an extraordinary transmission of light through small holes (<200 nm) in a thin metallic film has been described. This phenomenon has been shown to be the result of the photon-plasmon interaction in thin films where a periodic structure (such as a set of holes) is embedded in the film. One of the extraordinary results is that the beam...conference paper 2004
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- Van Den Doel, L.R. (author), Young, I.T. (author), Van Vliet, L.J. (author) conference paper 2001
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- Van Ginkel, M. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author) conference paper 2001
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- Bakker, P. (author), Van Vliet, L.P. (author), Verbeek, P.W. (author) conference paper 2001
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- Rieger, B. (author), Van Vliet, L.J. (author) conference paper 2001
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- Bakker, P. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author) conference paper 2001