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Smeelen, M.A. (author), Schwering, P.B.W. (author), Toet, A. (author), Loog, M. (author)The defense and security community have to cope with threats in complex environments that are merged in the scene context. The aim of this study is to investigate if fusion of Gated Viewer images with traditional thermal IR images provides a solution for threat recognition (with context understanding) in complex environments; and if contextual...conference paper 2014
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Santini, F. (author), Palombo, A. (author), Dekker, R.J. (author), Pignatti, S. (author), Pascucci, S. (author), Schwering, P.B.W. (author)Anomalous pixel responses often seriously affect remote sensing applications, especially in the thermal spectral range. In this paper, a new method to identify and correct anomalous pixel responses is presented. The method was specifically developed to handle with hyperspectral data and is based on the statistical analysis of a gray scale RX...article 2014
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van Eekeren, A.W.M. (author), Huebner, C.S. (author), Dijk, J. (author), Schutte, K. (author), Schwering, P.B.W. (author)Atmospheric turbulence is a well-known phenomenon that diminishes the recognition range in visual and infrared image sequences. There exist many different methods to compensate for the effects of turbulence. This paper focuses on the performance of two software-based methods to mitigate the effects of low-And medium turbulence conditions. Both...conference paper 2014
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de Jong, A.N. (author), Schwering, P.B.W. (author), Benoist, K.W. (author), Gunter, W.H. (author), Vrahimis, G. (author), October, F.J. (author)For users of Electro-Optical (EO) sensors at sea, knowledge on their resolution is of key operational importance for the prediction of the obtainable classification ranges. Small targets may be located at ranges of 20 km and more and the present day sensor pixel size may be as small as 10 μrad. In this type of scenarios, sensor resolution will...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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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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Smeelen, M.A. (author), Schwering, P.B.W. (author), Toet, A. (author), Loog, M. (author)Defense and security surveillance scenarios typically involve the detection and classification of targets in complex and dynamic backgrounds. Imaging systems deployed for this purpose should therefore provide imagery that enables optimal simultaneous recognition of both targets and their context. Here we investigate the recognition of semi...article 2013
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Dekker, R.J. (author), Schwering, P.B.W. (author), Benoist, K.W. (author), Pignatti, S. (author), Santini, F. (author), Friman, O. (author)This paper studies change detection of LWIR (Long Wave Infrared) hyperspectral imagery. Goal is to improve target acquisition and situation awareness in urban areas with respect to conventional techniques. Hyperspectral and conventional broadband high-spatial-resolution data were collected during the DUCAS trials in Zeebrugge, Belgium, in June...conference paper 2013
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Schwering, P.B.W. (author), Kemp, R.A.W. (author), Schutte, K. (author)Recognition and identification ranges are limited to the quality of the images. Both the received contrast and the spatial resolution determine if objects are recognizable. Several aspects affect the image quality. First of all the sensor itself. The image quality depends on the size of the infrared detector array and the sensitivity. Second,...conference paper 2013
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van Eekeren, A.W.M. (author), Schutte, K. (author), Dijk, J. (author), Schwering, P.B.W. (author)A well-known phenomena that diminishes the recognition range in infrared imagery is atmospheric turbulence. In literature many methods are described that try to compensate for the distortions caused by atmospheric turbulence. Most of these methods use a global processing approach in which they assume a global shift and a uniform blurring in all...conference paper 2013
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de Jong, A.N. (author), Schwering, P.B.W. (author), van Eijk, A.M.J. (author), Gunter, W.H. (author)Various atmospheric propagation effects are limiting the long range performance of electro-optical imaging systems. These effects include absorption and scattering by molecules and aerosols, refraction due to vertical temperature gradients and scintillation and blurring due to turbulence. In maritime and coastal areas, ranges up to 25 km are...article 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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van Eekeren, A.W.M. (author), Schutte, K. (author), Dijk, J. (author), Schwering, P.B.W. (author)To compensate for visual artifacts due to atmospheric turbulence is of key importance for the task of visual identification over long distances. In this paper we propose a new method to compensate the visual effects of turbulence, which makes identification possible over larger distances. Our method is based on applying phase diversity imaging...conference paper 2012
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de Jong, A.N. (author), Schwering, P.B.W. (author), Benoist, K.W. (author), Gunter, W.H. (author), Vrahimis, G. (author), October, F.J. (author)During the FATMOSE trial, held over the False Bay (South Africa) from November 2009 until October 2010, day and night (24/7) high resolution images were collected of point sources at a range of 15.7 km. Simultaneously, data were collected on atmospheric parameters, as relevant for the turbulence conditions: air- and sea temperature, windspeed,...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
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Velluet, M.T. (author), Vorontsov, M. (author), Schwering, P.B.W. (author), Marchi, G. (author), Nicolas, S. (author), Riker, J. (author)The performance of optical systems is degraded by atmospheric turbulence. Over propagation distances that exceed several kilometers, it is difficult to evaluate its impact because of terrain variability - a factor that should be taken into account. However, to optimize performance, the turbulence characteristics and its effect on optical wave...conference paper 2012
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Renhorn, I. (author), Axelsson, M. (author), Benoist, K.W. (author), Bourghys, D. (author), Boucher, Y. (author), Xavier Briottet, X. (author), De Sergio De CeglieD, S. (author), Dekker, R.J. (author), Dimmeler, A. (author), Dost, R. (author), Friman, O. (author), Kåsen, I. (author), Maerker, J. (author), van Persie, M. (author), Resta, S. (author), Schwering, P.B.W. (author), Shimoni, M. (author), Vegard Haavardsholm, T. (author)The EDA project “Detection in Urban scenario using Combined Airborne imaging Sensors” (DUCAS) is in progress. The aim of the project is to investigate the potential benefit of combined high spatial and spectral resolution airborne imagery for several defense applications in the urban area. The project is taking advantage of the combined...conference paper 2012
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van Eekeren, A.W.M. (author), Schutte, K. (author), Schwering, P.B.W. (author)A novel software method enhances camera images blurred by the atmospherearticle 2012
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Schutte, K. (author), van Eekeren, A.W.M. (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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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