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van der Burg, E. (author), Hogervorst, M.A. (author), Toet, A. (author)Natural scenes are typically highly heterogeneous, making it difficult to assess camouflage effectiveness for moving objects since their local contrast varies with their momentary position. Camouflage performance is usually assessed through visual search and detection experiments involving human observers. However, such studies are time...conference paper 2022
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van der Waa, J. (author), Nieuwburg, E. (author), Cremers, A. (author), Neerincx, M. (author)Current developments in Artificial Intelligence (AI) led to a resurgence of Explainable AI (XAI). New methods are being researched to obtain information from AI systems in order to generate explanations for their output. However, there is an overall lack of valid and reliable evaluations of the effects on users' experience of, and behavior in...article 2021
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- Piras, D. (author), van Neer, P.L.M.J. (author), Thijssen, R.M.T. (author), Sadeghian, H. (author) article 2020
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van Kooten, M.A.M. (author), Doelman, N.J. (author), Kenworthy, M. (author)For high-contrast imaging systems, such as VLT/SPHERE, the performance of the system at small angular separations is contaminated by the wind-driven halo in the science image. This halo is a result of the servo-lag error in the adaptive optics (AO) system due to the finite time between measuring the wavefront phase and applying the phase...article 2020
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van Kooten, M. (author), Doelman, N.J. (author), Kenworthy, M. (author)For high-contrast imaging systems, the time delay is one of the major limiting factors for the performance of the extreme adaptive optics (AO) sub-system and, in turn, the final contrast. The time delay is due to the finite time needed to measure the incoming disturbance and then apply the correction. By predicting the behavior of the...article 2019
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van Kooten, M.A.M. (author), Doelman, N.J. (author), Kenworthy, M. (author)In an adaptive optics (AO) system, finite time delays contribute a relatively large amount to the overall wavefront error. The temporal error, due to the time delays, adds to the speckle halo which is visible in the science plane of a high contrast imaging (HCI) instrument. The halo limits the inner working angle, preventing HCI from probing...conference paper 2018
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van Kooten, M. (author), Doelman, N.J. (author), Kenworthy, M. (author)Current high contrast imaging systems are limited at small angular separations, preventing the direct imaging of Earth-size exoplanets close to their host stars. One primary cause of this is the performance of the extreme adaptive optics (AO) system which is dominated by the servo-lag error at small angular separations. Prediction can be used to...conference paper 2017
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Silvestri, F. (author), Gerini, G. (author), Bäumer, S.M.B. (author)In the last years, much interest has grown around the concept of optical surfaces employing high contrast dielectric resonators. However, a systematic approach for the design of this optical surfaces under particular requirements has never been proposed. In this contribution, we describe this approach applied to the robust design of an array of...conference paper 2017
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de Lange-Brokaar, B.J.E. (author), Ioan-Facsinay, A. (author), Yusuf, E. (author), Visser, A.W. (author), Kroon, H.M. (author), van Osch, G.J.V.M. (author), Zuurmond, A.M. (author), Stojanovic-Susulic, V. (author), Bloem, J.L. (author), Nelissen, R.G.H.H. (author), Huizinga, T.W. (author), Kloppenburg, M. (author)Objective To determine possible patterns of synovitis on contrast-enhanced magnetic resonance imaging (CE-MRI) and its relation to pain and severity in patients with radiographic knee osteoarthritis (OA). Methods In total, 86 patients (mean age 62 years, 66% women, median body mass index 29 kg/m2) with symptomatic knee OA (Kellgren/Lawrence...article 2015
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Tsai, M.Y. (author), Hoek, G. (author), Eeftens, M. (author), de Hoogh, K. (author), Beelen, R. (author), Beregszászi, T. (author), Cesaroni, G. (author), Cirach, M. (author), Cyrys, J. (author), de Nazelle, A. (author), de Vocht, F. (author), Ducret-Stich, R. (author), Eriksen, K. (author), Galassi, C. (author), Gražuleviciene, R. (author), Gražulevicius, T. (author), Grivas, G. (author), Gryparis, A. (author), Heinrich, J. (author), Hoffmann, B. (author), Iakovides, M. (author), Keuken, M. (author), Krämer, U. (author), Künzli, N. (author), Lanki, T. (author), Madsen, C. (author), Meliefste, K. (author), Merritt, A.S. (author), Mölter, A. (author), Mosler, G. (author), Nieuwenhuijsen, M.J. (author), Pershagen, G. (author), Phuleria, H. (author), Quass, U. (author), Ranzi, A. (author), Schaffner, E. (author), Sokhi, R. (author), Stempfelet, M. (author), Stephanou, E. (author), Sugiri, D. (author), Taimisto, P. (author), Tewis, M. (author), Udvardy, O. (author), Wang, M. (author), Brunekreef, B. (author)An increasing number of epidemiological studies suggest that adverse health effects of air pollution may be related to particulate matter (PM) composition, particularly trace metals. However, we lack comprehensive data on the spatial distribution of these elements.We measured PM<inf>2.5</inf> and PM<inf>10</inf> in twenty study areas across...article 2015
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Toet, A. (author), Wu, T. (author)A simple power-logarithm histogram modification operator is proposed to enhance infrared (IR) image contrast. The algorithm combines a logarithm operator that smoothes the input image histogram while retaining the relative ordering of the original bins, with a power operator that restores the smoothed histogram to an approximation of the original...article 2015
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Wu, T. (author), Toet, A. (author)A simple power-logarithm histogram modification operator is proposed to enhance digital image contrast. First a logarithm operator reduces the effect of spikes and transforms the image histogram into a smoothed one that approximates a uniform histogram while retaining the relative size ordering of the original bins. Then a power operator...conference paper 2014
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Dijk, J. (author), van Eekeren, A.W.M. (author), Toet, A. (author), den Hollander, R.J.M. (author), Schutte, K. (author), van Heijningen, A.W.P. (author), Bijl, P. (author)For many military operations, situational awareness is of great importance. During night conditions, this situational awareness can be improved using both analog and digital image-intensified cameras. The quality of image intensifiers is a topic of interest. One of the differences between a digital and analog system is noise behavior. For...article 2013
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Alić, L. (author), van Vliet, M. (author), Wielopolski, P.A. (author), ten Hagen, T.L.M. (author), van Dijke, C.F. (author), Niessen, W.J. (author), Veenland, J.F. (author)Experimental evidence supports an association between heterogeneity in tumor perfusion and response to chemotherapy/radiotherapy, disease progression and malignancy. Therefore, changes in tumor perfusion may be used to assess early effects of tumor treatment. However, evaluating changes in tumor perfusion during treatment is complicated by...article 2013
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George, A. (author), Stawski, T.M. (author), Unnikrishnan, S. (author), Veldhuis, S.A. (author), ten Elshof, J.E. (author)A simple and cost effective methodology for large area micro and nanopatterning of a wide range of functional materials on flexible substrates is presented. A hydrophobic-hydrophilic chemical contrast was patterned on surfaces of various flexible plastic substrates using molds and shadow masks with which selected areas of the substrate surface...article 2012
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Schols, R.M. (author), Bouvy, N.D. (author), Wieringa, F.P. (author), Alić, L. (author), Stassen, L.P.S. (author)INTRODUCTION: In thyroid and parathyroid surgery iatrogenic injury of the parathyroid glands or the recurrent laryngeal nerve (RLN) is a possible complication that needs to be prevented. The visible contrast between thyroid and parathyroid tissue is delicate to observe. The aim of this pilot study was to collect in vivo spectral reflectance...conference paper 2012
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Bijl, P. (author), Beintema, J.A. (author), Dijk, J. (author), van der Leden, N. (author)Moving imagery from a static scene was recorded with an uncooled thermal imager at nine different angular velocities ranging from 0 (static) to 1 pixel∕frame (3.75 deg ∕s) using a tilted rotating mirror. The scene contained a thermal acuity test chart with triangular test patterns based on the triangle orientation discrimination (TOD) test...article 2012
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Weiss, A.R. (author), Adomeit, U. (author), Chevalier, P. (author), Landeau, S. (author), Bijl, P. (author), Champagnat, F. (author), Dijk, J. (author), Göhler, B. (author), Landini, S. (author), Reynolds, J.P. (author), Smith, L.N. (author)Modern IR cameras are increasingly equipped with built-in advanced (often non-linear) image and signal processing algorithms (like fusion, super-resolution, dynamic range compression etc.) which can tremendously influence performance characteristics. Traditional approaches to range performance modeling are of limited use for these types of...conference paper 2012
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Toet, A. (author)The predictions of 13 computational bottom-up saliency models and a newly introduced Multiscale Contrast Conspicuity (MCC) metric are compared with human visual conspicuity measurements. The agreement between human visual conspicuity estimates and model saliency predictions is quantified through their rank order correlation. The maximum of the...article 2011
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Westerveld, W.J. (author), Harmsma, P.J. (author), Schmits, R. (author), Tabak, E. (author), Pozo Torres, J.M. (author), Urbach, H.P. (author), Yousefi, M. (author)Silicon-on-insulator (SOI) technology has become one of the focus platforms for photonic integrated circuits (PICs). The CMOS technology opens the possibility for reliable mass fabrication of cost-effective photonic circuits. Recently there has been a growing interest in direct optical sensing of, for example, temperature, pressure or strain,...conference paper 2011