- document
-
TNO Defensie en Veiligheid (author), Hogervorst, M.A. (author), Toet, A. (author)We have tested a prototype dual-band NVG system consisting of two NVGs fitted with filters that split the NVG sensitive range into a short (visual) and a long wavelength (NIR) band. The Color-the-night technique (see Hogervorst & Toet, SPIE D&S ‘08) was used to fuse the images of the two sensors. We designed a color scheme especially optimized...conference paper 2009
- document
- Toet, L. (author), TNO Defensie en Veiligheid (author) article 2008
- document
-
TNO Defensie en Veiligheid (author), de Jong, A.N. (author), Schwering, P.B.W. (author), Fritz, P.J. (author)Complementary to a measurement campaign of small surface targets in the False Bay, South Africa [1], a set-up could be arranged of atmospheric propagation experiments. This opportunity allowed us to collect another set of transmission data in a coastal area, where the environmental conditions are generally non-homogeneous and rapidly changing....conference paper 2008
- document
-
TNO Defensie en Veiligheid (author), Toet, A. (author), Wu, T. (author)We present an algorithm that produces a fused false color representation of a combined multiband IR and visual imaging system for maritime applications. Multispectral IR imaging techniques are increasingly deployed in maritime operations, to detect floating mines or to find small dinghies and swimmers during search and rescue operations. However...conference paper 2008
- document
-
TNO Defensie en Veiligheid (author), Toet, A. (author), Groen, E.l. (author), Oosterbeek, M.T.J. (author), Hooge, I.T.C. (author)We tested the saliency of a single vibrotractile target (T) among 2 to 7 nontargets (N), presented by 8 tactors that were equally distributed over a horizontal band around the torso. Targets and nontargets had different pulse duration, but the same activation period and no onset asynchrony. T-N similarity was varied by changing the difference...conference paper 2008
- document
-
TNO Defensie en Veiligheid (author), de Jong, A.N. (author), Schwering, P.B.W. (author), Fritz, P.J. (author)Complementary to a measurement campaign of small surface targets in the False Bay, South Africa [1], a set-up could be arranged of atmospheric propagation experiments. This opportunity allowed us to collect another set of transmission data in a coastal area, where the environmental conditions are generally non-homogeneous and rapidly changing....conference paper 2008
- document
-
TNO Defensie en Veiligheid (author), de Lange, D.J.J. (author), Dijk, J. (author), van Eekeren, A.W.M. (author), Schutte, K. (author)Surveillance applications are primarily concerned with detection of targets. In electro-optical surveillance systems, missiles or other weapons coming towards you are observed as moving points. Typically, such moving targets need to be detected in a very short time. One of the problems is that the targets will have a low signal-to-noise ratio...conference paper 2007
- document
-
TNO Defensie en Veiligheid (author), Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author)We developed four new techniques to visualize hyper spectral image data for man-in-the-loop target detection. The methods respectively: (1) display the subsequent bands as a movie (movie), (2) map the data onto three channels and display these as a colour image (colour), (3) display the correlation between the pixel signatures and a known...conference paper 2007
- document
-
Alferdinck, J.W.A.M. (author), TNO Defensie en Veiligheid (author)During night-time driving hazardous objects often appear at mesopic light levels, which are typically measured using light meters with a spectral sensitivity that is only valid for photopic light levels. In order to develop suitable mesopic models a target detection experiment was performed in a driving simulator. While subjects drove along a...article 2006
- document
-
TNO Defensie en Veiigheid (author), Kunz, G.J. (author), Bekman, H.H.P.T. (author), Benoist, K.W. (author), Cohen, L.H. (author), van den Heuvel, J.C. (author), Putten, F.J.M. (author)Small maritime targets, e.g., periscope tubes, jet skies, swimmers and small boats, are potential threats for naval ships under many conditions, but are difficult to detect with current radar systems due to their limited radar cross section and the presence of sea clutter. On the other hand, applications of lidar systems have shown that the...conference paper 2005
- document
-
TNO Defensie en Veiligheid (author), Hogervorst, M.A. (author), Toet, A. (author), Bijl, P. (author)We determined the relationship between search performance with a limited field of view (FOV) and several scanning- and scene parameters in human observer experiments. The observers (38 trained army scouts) searched through a large search sector for a target (a camouflaged person) on a heath. From trial to trial the target appeared at a different...conference paper 2005
- document
-
TNO Fysisch en Elektronisch Laboratorium (author), de Jong, A.N. (author)The sensitivity of modern infrared sensors, using cooled Focal Plane Arrays (FPA's), allows the detection of small incoming airborne targets at sea as soon as they pop-up over the horizon. Experiments show strong fluctuations of the contrast-irradiance level of target and background at the entrance pupil of the sensor. The characteristics of...conference paper 2004
- document
-
van IJsselmuide, S.P. (author), Beerens, S.P. (author), Doisy, Y. (author), Deruaz, L. (author), TNO Fysisch en Elektronisch Laboratorium (author)Low Frequency Active Sonar (LFAS) systems are originally designed for ASW purposes. Although their main purpose is detection of submarines, they can, if adjusted waveforms are transmitted, also be used for detection of small fast moving targets (torpedoes). In this study the Detection, Classification and Localisation performance of classical HFM...conference paper 2003
- document
-
Toet, A. (author), TNO Technische Menskunde (author)Multispectral IR imaging techniques are frequently deployed in maritime operations, for instance to detect floating mines or to find small dinghies and swimmers during search and rescue operations. However, maritime backgrounds usually contain a large amount of clutter that severely hampers the detection of dim point targets. Here we present a...conference paper 2002
- document
-
Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author), Valeton, J.M. (author)In order to find an optimal scanning strategy we determined the relationship between search performance and several scanning- and scene parameters in human observer experiments. The observers searched with a limited field of view (FOV) through a large search sector for a target (a camouflaged person) on a heath. From trial to trial the target...conference paper 2002
- document
-
TNO Fysisch en Elektronisch Laboratorium (author), van Koersel, A.C. (author), Beerens, S.P. (author)Measurements of different types of aircraft are performed and used to obtain information on target characteristics and develop an algorithm to perform classification between jet aircraft, propeller aircraft and helicopters. To obtain a larger detection range, reduce background noise and to reduce classification errors in a multi-target...conference paper 2002
- document
-
Toet, A. (author), Bijl, P. (author), Valeton, J.M. (author)The TNO Human Factors Searchû2 image dataset consists of: a set of 44 high-resolution digital color images of different complex natural scenes, the ground truth corresponding to each of these scenes, and the results of psychophysical experiments on each of these images. The images in the Searchû2 dataset are a subset of a larger set that has...article 2001
- document
-
TNO Fysisch en Elektronisch Laboratorium (author), Dekker, R.J. (author), van den Broek, A.C. (author)Target detection and recognition using polarimetric SAR data has been studied by using PHARUS and RAMSES data collected during the MIMEX campaign. Additionally very high-resolution ISAR data was used. A basic detection and recognition scheme has been developed, which includes polarimetric speckle-filtering, CFAR detection and the extraction of...conference paper 2000
- document
-
de Jong, A.N. (author), Kemp, R.A.W. (author), TNO Fysisch en Elektronisch Laboratorium (author)The detection of small surface targets at sea is an increasing requirement for warships. The present sensors on board do not provide the required detection probabilities for these low observable targets like small rubber boats, floating mines, periscopes, people etc. The reason for the low probability of detection is not only the low contrast...conference paper 1998
- document
-
Toet, A. (author), IJspeert, J. (author), Waxman, A.M. (author), Aguilar, M. (author), TNO Human Factors Research Institute (author)Two recently developed color image fusion techniques, the TNO fusion scheme and the MIT fusion scheme, are applied to visible and thermal images of military relevant scenarios. An observer experiment is performed to test if the increased amount of detail in the fused images can yield an improved observer performance in a task that requires...conference paper 1997