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Schoemaker, R.M. (author), de Leeuw, G. (author), TNO Defensie en Veiligheid (author)Aerosol properties are retrieved from ATSR-2 data (ERS-2 satellite) by utilizing the dual view for application over land and the single view for application over water. These two algorithms have been merged into a fast and efficient algorithm that allows for near real-time processing and which is suitable for operational use. It includes...conference paper 2005
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TNO Defensie en Veiligheid (author), van den Hengel, E.I.V. (author), Deen, N.G. (author), Kuipers, J.A.M. (author)In this work, a discrete bubble model (DBM) is used to investigate the hydrodynamics, coalescence, and breakup occurring in a bubble column. The DBM, originally developed by Delnoij et al. (Chem. Eng. Sci. 1997, 52, 1429-1458; Chem. Eng. Sci. 1999, 54, 2217-2226),1-2 was extended to incorporate models describing the breakup and coalescence along...article 2005
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Risk assessment of silicosis and lung cancer among construction workers exposed to respirable quartzTNO Kwaliteit van Leven TNO Voeding (author), Tjoe Nij, E. (author), Heederik, D. (author)Objectives: The aim of this study was to assess the magnitude of the silicosis and cancer risk among construction workers. Methods: In 1998, 1335 of 4173 invited construction workers with expected high cumulative exposure to quartz were studied for early signs of silicosis. In 2002 the study was repeated for 96 persons. Exposure measurements...article 2005
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TNO Kwaliteit van Leven TNO Voeding (author), Garosi, P. (author), de Filippo, C. (author), van Erk, M. (author), Rocca-Serra, P. (author), Sansone, S.A. (author), Elliott, R. (author)Microarrays represent a powerful tool for studies of diet-gene interactions. Their use is, however, associated with a number of technical challenges and potential pitfalls. The cost of microarrays continues to drop but is still comparatively high. This, coupled with the complex logistical issues associated with performing nutritional microarray...article 2005
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Greidanus, H. (author), Clayton, P. (author), Indregard, M. (author), Staples, G. (author), Suzuki, N. (author), Vachon, P. (author), Wackerman, C. (author), Tennvassas, T. (author), Mallorqui, J. (author), Kourti, N. (author), Ringrose, R. (author), Melief, H. (author), TNO Fysisch en Elektronisch Laboratorium (author)The performances of eight satellite SAR ship detection systems (most of them operational) are compared, by running a benchmark test on RADARSAT images of various modes. No single system is best under all circumstances.conference paper 2004
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Carton, E.P. (author), Prins Maurits Laboratorium TNO (author)Experimental results of wavy metal interfaces obtained by explosive welding are presented and used to determine which wave forming mechanism occurred. It was found that for small collision angles (smaller than about 20°) the Von Karman or jet indentation mechanism occurs, while for large collision angles a straight metal interface is obtained....conference paper 2004
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de Jong, A.N. (author)When images are made of distant targets over long atmospheric paths, local variations of the refractive index of the air may lead to severe optical distortions and aberrations. An extreme example of such variations is the stream of hot exhaust gases on ships. The performance of infrared and optical sensors, mounted on elevated platforms on board...conference paper 2004
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Leifer, I. (author), de Leeuw, G. (author), Kunz, G. (author), Cohen, L.H. (author)Bubble sizing by optical means is very common, but requires calibration by non-optical means. This is particularly important since apparent bubble size increases with decreasing threshold intensity. A calibration experiment was conducted comparing the displaced water mass from captured bubbles with backlit optical bubble size. The results showed...article 2003
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van Erp, J.B.F. (author), Padmos, P. (author)Indirect viewing systems such as tv cameras can potentially support drivers under low visibility conditions or when the driver's field of view (FOV) is restricted. In three experiments, we identified the critical image parameters of such systems on vehicle control. We used a taskbattery that measured lateral and longitudinal vehicle control in...article 2003
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TNO Fysisch en Elektronisch Laboratorium (author), van der Mark, W. (author), van den Heuvel, J.C. (author), den Breejen, E. (author), Groen, F.C.A. (author)Vehicles that serve in the role as landmine detection robots could be an important tool for demining former conflict areas. On the LOTUS platform for humanitarian demining, different sensors are used to detect a wide range of landmine types. Reliable and accurate detection depends on correctly combining the observations from the different...conference paper 2003
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TNO Fysisch en Elektronisch Laboratorium (author), Schutte, K. (author), de Lange, D.J. (author), van den Broek, S.P. (author)In tactical sensor imagery there always is a need for less noise, higher dynamic range and more resolution. Although recent developments lead to better and better Focal Plane Array (FPA) camera systems, modern infrared FPA camera system are still hindered by non-uniformities, a limited signal-to-noise ratio and a limited spatial resolution. The...conference paper 2003
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TNO Technische Menskunde (author), Kooi, F.L. (author), Toet, A. (author)Image fusion is the generally preferred method to combine two or more images for visual display on a single screen. We demonstrate that perceptual image separation may be preferable over perceptual image fusion for the combined display of enhanced and synthetic imagery. In this context image separation refers to the simultaneous presentation of...conference paper 2003
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Riecke, B.E. (author), van Veen, H.A.H.C. (author), Bulthoff, H.H. (author), TNO Technische Menskunde (author)The literature often suggests that proprioceptive and especially vestibular cues are required for navigation and spatial orientation tasks involving rotations of the observer. To test this notion, we conducted a set of experiments in virtual environments in which only visual cues were provided. Participants had to execute turns, reproduce...article 2002
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Zagers, N.P.A. (author), van de Kraats, J. (author), Berendschot, T.T.J.M. (author), van Norren, D. (author)An instrument for simultaneous measurement of foveal spectral reflectance and cone-photoreceptor directionality is described. The key element is an imaging spectrograph (spectral range of 420–790 nm) with its entrance slit conjugate to the pupil plane of a human eye. A 1.9-deg spot on the retina is sampled in 1 s. Video observation of the retina...article 2002
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TNO Fysisch en Elektronisch Laboratorium (author), Kemp, R.A.W. (author)The analysis of video observation tapes can be tedious and tiring work. An analysis system can relieve this burden and create a compilation tape autonomously. Working unattended AVACS creates a tape and a Compact Disk (CD) with only the images-of-interest.conference paper 2002
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Toet, A. (author), IJspeert, J.K. (author), TNO Technische Menskunde (author)Human perceptual performance was tested with images of nighttime outdoor scenes. The scenes were registered both with a dual band (visual and near infrared) image intensified low-light CCD camera (DII) and with a thermal middle wavelength band (3-5 μm) infrared (IR) camera. Fused imagery was produced through a pyramid image merging scheme, in...conference paper 2001
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Malakar, P.K. (author), Brocklehurst, T.F. (author), Mackie, A.R. (author), Wilson, P.D.G. (author), Zwietering, M.H. (author), van 't Riet, K. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Fluorescence ratio imaging is a non-invasive technique for studying the formation of microgradients in immobilised bacterial colonies. These gradients can be quantified easily when combined with the gel cassette system designed at the Institute of Food Research, Norwich, UK. Colonies of Lactobacillus curvatus were observed using this technique...article 2000
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Fdez-Vidal, X.R. (author), Toet, A. (author), Garcia, J.A. (author), Fdez-Valdivia, J. (author)This paper presents three computational visual distinctness measures, computed from image representational models based on selective filtering, statistical features, and visual patterns, respectively. They are applied to quantify the visual distinctness of targets in complex natural scenes. The measure that applies a simple decision rule to the...article 2000
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- Riecke, B.E. (author), van Veen, H.A.H.C. (author), Bulthoff, H.H. (author), Max Planck Institut fur biologische Kybernetik (author) report 2000
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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