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den Hollander, R.J.M. (author), van Rooij, S.B. (author), van den Broek, S.P. (author), Dijk, J. (author)An important surveillance task during naval military operations is early risk assessment of vessels. The potential risk that a vessel poses will depend on the vessel type, and vessel classification is therefore a basic technique in risk assessment. Although automatic identification by AIS is widely available, the AIS transponders can potentially...conference paper 2021
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- Dijk, J. (author), van den Broek, S.P. (author), den Hollander, R.J.M. (author), Baan, J. (author), ten Hove, J.M. (author), Oorbeek, D. (author) conference paper 2021
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Pruim, R.H.R. (author), van Opbroek, A. (author), Kruithof, M.C. (author), den Hollander, R.J.M. (author), Baan, J. (author), van den Broek, S.P. (author), van der Stap, N. (author), Dijk, J. (author)Automatic detection and tracking of maritime targets in imagery can greatly increase situation awareness on naval vessels. Various methods for detection and tracking have been proposed so far, both for reasoning as well as for learning approaches. Learning approaches have the promise to outperform reasoning approaches. They typically detect...conference paper 2019
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Huizinga, W. (author), van Opbroek, A.G. (author), Raimon, H.R. (author), Pruim, R.H.R. (author), den Hollander, R.J.M. (author), van den Broek, S.P. (author), van den Schook, E.S. (author), Schutte, K. (author), van den Stap, N. (author), Dijk, J. (author)Imaging systems can be used to obtain situational awareness in maritime situations. Important tools for these systems are automatic detection and tracking of objects in the acquired imagery, in which numerous methods are being developed. When designing a detection or tracking algorithm, its quality should be ensured by a comparison with existing...article 2019
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van der Stap, N. (author), van Opbroek, A.G. (author), Huizinga, W. (author), Wilmer, M.M.G. (author), van den Broek, S.P. (author), Pruim, R.H.R. (author), den Hollander, R.J.M. (author), Schutte, K. (author), Dijk, J. (author)Detecting maritime targets with electro-optical sensors is an active area of research. One current trend is to automate target detection through image processing or computer vision. Automation of target detection will decrease the number of people required for lower-level tasks, which frees capacity for higher-level tasks. A second trend is that...conference paper 2018
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Neumann, N.M.P. (author), Knegjens, R. (author), Den Hollander, R. (author), Oggero, S. (author), Burghouts, G.J. (author), Van Den Broek, S.P. (author)Algorithms for the detection and tracking of objects can be combined into a system that automatically extracts relevant events from a large amount of video data. Such a system , can be particularly useful in video surveillance applications, notably to support analysts in retrieving information from hours of video while working under strict time...conference paper 2018
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van den Broek, S.P. (author), Nieuwenhuizen, R.P.J. (author), Fischer, N.M. (author), ter Haar, F.B. (author), Baan, J. (author), Van Der Stap, N. (author), Dijk, J. (author), Schutte, K. (author)Naval ships have camera systems available to assist in performing their operational tasks. Some include automatic detection and tracking, assisting an operator by keeping a ship in view or by keeping collected information about ships. Tracking errors limit the use of camera information. When keeping a ship in view, an operator has to re-Target a...conference paper 2016
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Bouma, H. (author), Baan, J. (author), ter Haar, F.B. (author), Eendebak, P.T. (author), den Hollander, R.J.M. (author), Burghouts, G.J. (author), Wijn, R. (author), van den Broek, S.P. (author), van Rest, J.H.C. (author)In the security domain, cameras are important to assess critical situations. Apart from fixed surveillance cameras we observe an increasing number of sensors on mobile platforms, such as drones, vehicles and persons. Mobile cameras allow rapid and local deployment, enabling many novel applications and effects, such as the reduction of violence...conference paper 2015
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Dijk, J. (author), Bijl, P. (author), van den Broek, S.P. (author), van Eijk, A.M.J. (author)Our world is constantly changing, and this has its effect on worldwide military operations. For example, there is a change from conventional warfare into a domain that contains asymmetric threats as well. The availability of high-quality imaging information from Electro-Optical (EO) sensors is of high importance, for instance for timely...conference paper 2014
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van den Broek, S.P. (author), Bouma, H. (author), Veerman, H.E.T. (author), Benoist, K.W. (author), den Hollander, R.J.M. (author), Schwering, P.B.W. (author)Long-term tracking is important for maritime situational awareness to identify currently observed ships as earlier encounters. In cases of, for example, piracy and smuggling, past location and behavior analysis are useful to determine whether a ship is of interest. Furthermore, it is beneficial to make this assessment with sensors (such as...conference paper 2014
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Burghouts, G.J (author), Schutte, K (author), ten Hove, R.J.M. (author), van den Broek, S.P. (author), Baan, J. (author), Rajadell, O. (author), van Huis, J.R. (author), van Rest, J.H.C. (author), Hanckmann, P. (author), Bouma, H. (author), Sanroma, G. (author), Evans, M. (author), Ferryman, J. (author)Threat detection is a challenging problem, because threats appear in many variations and differences to normal behaviour can be very subtle. In this paper, we consider threats on a parking lot, where theft of a truck’s cargo occurs. The theft takes place in very different forms, in the midst of many people who pose no threat. The threats range...article 2014
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van den Broek, S.P. (author), Bouma, H. (author), den Hollander, R.J.M. (author), Veerman, H.E.T. (author), Benoist, K.W. (author), Schwering, P.B.W. (author)For maritime situational awareness, it is important to identify currently observed ships as earlier encounters. For example, past location and behavior analysis are useful to determine whether a ship is of interest in case of piracy and smuggling. It is beneficial to verify this with cameras at a distance, to avoid the costs of bringing an own...conference paper 2014
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Burghouts, G.J. (author), de Penning, H.L.H. (author), ten Hove, R.J.M. (author), Landsmeer, S. (author), van den Broek, S.P. (author), Hollander, R.J.M. (author), Hanckmann, P. (author), Kruithof, M.C. (author), van Leeuwen, C.J. (author), Korzec, S. (author), Bouma, H. (author), Schutte, K. (author)The contribution of this paper is a search engine that recognizes and describes 48 human actions in realistic videos. The core algorithms have been published recently, from the early visual processing (Bouma, 2012), discriminative recognition (Burghouts, 2012) and textual description (Hankmann, 2012) of 48 human actions. We summarize the key...conference paper 2013
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Burghouts, G.J. (author), van den Broek, S.P. (author), ten Hove, R.J.M. (author)Human actions are spatio-temporal patterns. A popular representation is to describe the action by features at interest points. Because the interest point detection and feature description are generic processes, they are not tuned to discriminate one particular action from the other. In this paper we propose a saliency measure for each individual...conference paper 2013
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Ditzel, M. (author), Kester, L.J.H.M. (author), van den Broek, S.P. (author), van Rijn, M. (author)Multilevel fusion systems need provisions to optimally schedule scarce processing and communication resources. To this end, we explore the idea of using utility-based metrics to optimize the run-time operation of a computation and communication constrained multilevel system, including automatic decision support measures such as course of action...conference paper 2013
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Bouma, H. (author), Burghouts, G.J. (author), de Penning, H.L.H. (author), Hanckmann, P. (author), ten Hove, R.J.M. (author), Korzec, S. (author), Kruithof, M.C. (author), Landsmeer, S. (author), van Leeuwen, C.J. (author), van den Broek, S.P. (author), Halma, A.H.R. (author), den Hollander, R.J.M. (author), Schutte, K. (author)Ground surveillance is normally performed by human assets, since it requires visual intelligence. However, especially for military operations, this can be dangerous and is very resource intensive. Therefore, unmanned autonomous visual-intelligence systems are desired. In this paper, we present an improved system that can recognize actions of a...conference paper 2013
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- Schwering, P.B.W. (author), van den Broek, S.P. (author), Liem, K.D. (author), Schleijpen, H.M.A. (author) conference paper 2012
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Burghouts, G.J. (author), Bouma, H. (author), den Hollander, R.J.M. (author), van den Broek, S.P. (author), Schutte, K. (author)We have developed a system that recognizes 48 human behaviors from video. The essential elements are (i) inference of the actors in the scene, (ii) assessment of event-related properties of actors and between actors, (iii) exploiting the event properties to recognize the behaviors. The performance of our recognizer approaches human performance,...conference paper 2012
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Bouma, H. (author), Hanckmann, P. (author), Marck, J.W. (author), de Penning, H.L.H. (author), den Hollander, R.J.M. (author), ten Hove, R.J.M. (author), van den Broek, S.P. (author), Schutte, K. (author), Burghouts, G.J. (author)Surveillance is normally performed by humans, since it requires visual intelligence. However, it can be dangerous, especially for military operations. Therefore, unmanned visual-intelligence systems are desired. In this paper, we present a novel system that can recognize human actions. Central to the system is a break-down of high-level...conference paper 2012
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van den Broek, S.P. (author), Schwering, P.B.W. (author), Liem, K.D. (author), Schleijpen, H.M.A. (author)In maritime operational scenarios, such as smuggling, piracy, or terrorist threats, it is not only relevant who or what an observed object is, but also where it is now and in the past in relation to other (geographical) objects. In situation and impact assessment, this information is used to determine whether an object is a threat. Single...conference paper 2012