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van Eekeren, A.W.M. (author), van Huis, J.R. (author), Eendebak, P.T. (author), Baan, J. (author)Airborne platforms, such as UAV's, with Wide Area Motion Imagery (WAMI) sensors can cover multiple square kilometers and produce large amounts of video data. Analyzing all data for information need purposes becomes increasingly labor-intensive for an image analyst. Furthermore, the capacity of the datalink in operational areas may be inadequate...conference paper 2015
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Cohen, K.M. (author), Gibbard, P.L. (author), Weerts, H.J.T. (author)The landscape evolution of the southern North Sea basin is complex and has left a geographically varying record of marine, lacustrine, fluvial and glacial sedimentation and erosion. Quaternary climatic history, which importantly included glaciation, combined with tectonics gave rise to cyclic and non-cyclic changes of sedimentation and erosion...article 2014
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Moreau, L. (author), Hunter, A.J. (author), Velichko, A. (author), Wilcox, P.D. (author)In nondestructive testing, being able to remotely locate and size defects with good accuracy is an important requirement in many industrial sectors, such as the petrochemical, nuclear, and aerospace industries. The potential of ultrasonic guided waves is well known for this type of problem, but interpreting the measured data and extracting...article 2014
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Hommen, G. (author), de Baar, M. (author), Duval, B.P. (author), Andrebe, Y. (author), Le, H.B. (author), Klop, M.A. (author), Doelman, N.J. (author), Witvoet, G. (author), Steinbuch, M. (author)A dual, high speed, real-time visible light camera setup was installed on the TCV tokamak to reconstruct optically and in real-time the plasma boundary shape. Localized light emission from the plasma boundary in tangential view, broadband visible images results in clearly resolved boundary edge-features. These projected features are detected in...article 2014
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van Eekeren, A.W.M. (author), Dijk, J. (author), Schutte, K. (author)In general, long range detection, recognition and identification in visual and infrared imagery are hampered by turbulence caused by atmospheric conditions. The amount of turbulence is often indicated by the refractive-index structure parameter Cn 2. The value of this parameter and its variation is determined by the turbulence effects over the...conference paper 2014
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- Abdul Fattah, R. (author), Meekes, S. (author), van Wees, J.D. (author) article 2014
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Mora, A. (author), Biermann, M. (author), Brown, A.G.A. (author), Busonero, D. (author), Carminati, L. (author), Carrasco, J.M. (author), Chassat, F. (author), Erdmann, M. (author), Gielesen, W.L.M. (author), Jordi, C. (author), Katz, D. (author), Kohley, R. (author), Lindegren, L. (author), Loeffler, W. (author), Marchal, O. (author), Panuzzo, P. (author), Seabroke, G. (author), Sahlmann, J. (author), Serpell, E. (author), Serraller, I. (author), van Leeuwen, F. (author), van Reeven, W. (author), van den Dool, T.C. (author), Vosteen, L.L.A. (author)The Gaia payload ensures maximum passive stability using a single material, SiC, for most of its elements. Dedicated metrology instruments are, however, required to carry out two functions: monitoring the basic angle and refocusing the telescope. Two interferometers fed by the same laser are used to measure the basic angle changes at the level...conference paper 2014
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Looy, C.V. (author), Stevenson, R.A. (author), Van Hoof, T.B. (author), Mander, L. (author)The Moscovian plant macroflora at Cottage Grove southeastern Illinois, USA, is a key example of Pennsylvanian (323-299 Million years ago) dryland vegetation. There is currently no palynological data fromthe same stratigraphic horizons as the plant macrofossils, leaves and other vegetative and reproductive structures, at this locality....article 2014
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van Heteren, S. (author), Meekes, J.A.C. (author), Bakker, M.A.J. (author), Gaffney, V. (author), Fitch, S. (author), Gearey, B.R. (author), Paap, B.F. (author)The North Sea subsurface shows the marks of long-term tectonic subsidence. Much of it contains a thick record of glacial and interglacial deposits and landscapes, formed during multiple glacial cycles and the associated regressions and transgressions during the past two million years. At times of lower sea level than today, areas that are...article 2014
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Wieringa, F.P. (author), Bouma, H. (author), Eendebak, P.T. (author), van Basten, J.P.A. (author), Beerlage, H.P. (author), Smits, G.A.H.J. (author), Bos, J.E. (author)In comparison to open surgery, endoscopic surgery offers impaired depth perception and narrower field-of-view. To improve depth perception, the Da Vinci robot offers three-dimensional (3-D) video on the console for the surgeon but not for assistants, although both must collaborate. We improved the shared perception of the whole surgical team by...article 2014
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Anitori, L. (author), Maleki, A. (author), Otten, M.P.G. (author), Baraniuk, R.G. (author), Hoogeboom, P. (author)We consider the problem of target detection from a set of Compressed Sensing (CS) radar measurements corrupted by additive white Gaussian noise. We propose two novel architectures and compare their performance by means of Receiver Operating Characteristic (ROC) curves. Using asymptotic arguments and the Complex Approximate Message Passing (CAMP)...article 2013
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Maleki, A. (author), Anitori, L. (author), Yang, Z. (author), Baraniuk, R.G. (author)Recovering a sparse signal from an undersampled set of random linear measurements is the main problem of interest in compressed sensing. In this paper, we consider the case where both the signal and the measurements are complex-valued. We study the popular recovery method of l1- regularized least squares or LASSO.While several studies have shown...article 2013
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Rudneva, M. (author), van Veldhoven, E. (author), Malladi, S.K. (author), Maas, D.J. (author), Zandbergen, H.W. (author)In this article, we present novel sample preparation methods using a helium ion microscope (HIM). We report the possibility of reshaping, at room temperature, thin metal lines on an electron-transparent membrane: A set of platinum bridges with standard geometry (300 × 200 × 15 nm) was modified at room temperature into different shapes using...article 2013
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Bonnett, B. (author), Hayes, M. (author), Hunter, A. (author)Coherent change detection between multiple synthetic aperture sonar (SAS) images is reliant on the images being co-registered with sub-pixel accuracy. In this paper we suggest a technique using available navigation data to reconstruct the images onto a common grid. Data obtained using the MUD SAS system is used to demonstrate this method. We...conference paper 2013
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van Rossum, W.L. (author), de Wit, J.J.M. (author), Tan, R.G. (author)At TNO an innovative concept to obtain inside building awareness with stand-off, through-the-wall radar has been developed: SAPPHIRE. The system concept exploits particular phase behavior in the 3D radar data to extract dominant scatterers inside a building. These scatterers can be reconstructed from the data using an overcomplete dictionary and...conference paper 2012
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Anitori, L. (author), Otten, M.P.G. (author), Hoogeboom, P. (author)In this paper we present results on application of Compressive Sensing (CS) to high resolution radar imaging and pro- pose the adaptive Complex Approximate Message Passing (CAMP) algorithm for image reconstruction. CS provides a theoretical framework that guarantees, under certain assumptions, reconstruction of sparse signals from many fewer...conference paper 2012
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Mulckhuyse, W.F.W. (author), Lahaye, D. (author), Belitskaya, A. (author)In 3D reconstruction problems the number of design variables is large and the forward model is typically computationally expensive. Reconstruction using gradient-based optimization algorithms requires many gradient computations. For such problems the computational cost of a finite difference approach to gradient calculation is prohibitive since...conference paper 2012
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van Eekeren, A.W.M. (author), Schutte, K. (author), Dijk, J. (author), Schwering, P.B.W. (author), van Iersel, M. (author), Doelman, N.J. (author)In general, long range visual detection, recognition and identification are hampered by turbulence caused by atmospheric conditions. Much research has been devoted to the field of turbulence compensation. One of the main advantages of turbulence compensation is that it enables visual identification over larger distances. In many (military)...conference paper 2012
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Kruithof, M.C. (author), van Eekeren, A.W.M. (author), Dijk, J. (author), Schutte, K. (author)High resolution sensors are required for recognition purposes. Low resolution sensors, however, are still widely used. Software can be used to increase the resolution of such sensors. One way of increasing the resolution of the images produced is using multi-frame super resolution algorithms. Limitation of these methods are that the...conference paper 2012
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Mora, A. (author), Vosteen, L.L.A. (author)The ESA Gaia spacecraft has two Shack-Hartmann wavefront sensors (WFS) on its focal plane. They are required to refocus the telescope in-orbit due to launch settings and gravity release. They require bright stars to provide good signal to noise patterns. The centroiding precision achievable poses a limit on the minimum stellar brightness...conference paper 2012