Searched for: subject:"Perception"
(1 - 10 of 10)
document
Hogervorst, M.A. (author), Eagle, R.A. (author)
It has been suggested that perceived three-dimensional (3D) structure-from-motion can be accounted for by a 2-frame orthographic approximation of the flow field. This study investigated the extent to which higher order cues (perspective and acceleration) are used in addition to first-order flow. Participants matched the 3D dihedral angle of a...
article 2000
document
Hogervorst, M.A. (author), Brenner, E. (author), TNO Technische Menskunde (author)
A common assumption in cue combination models is that small discrepancies between cues are due to the limited resolution of the individual cues. Whenever this assumption holds, information from the separate cues can best be combined to give a single, more accurate estimate of the property of interest. We examined whether information about the...
article 2004
document
Toet, A. (author), Hogervorst, M.A. (author), Bijl, P. (author), TNO Technische Menskunde (author)
We argue that visual conspicuity and identifiability are two efficient task-related measures that can be deployed to calibrate synthetic imagery that is intended to be used for human visual search and detection tasks. The conspicuity of a target is operationally defined as the region around the center of the visual field where the target is...
conference paper 2004
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Toet, A. (author), Hogervorst, M.A. (author), Nikolov, S.G. (author), Lewis, J. (author), Dixon, T. (author), Bull, D. (author), Canagarajah, N. (author), TNO Defensie en Veiligheid (author)
The increasing availability and deployment of imaging sensors operating in multiple spectral bands has led to a large research effort in image fusion, resulting in a plethora of pixel-level image fusion algorithms. However, the cognitive aspects of multisensor image fusion have not received much attention in the development of these methods. In...
conference paper 2007
document
Toet, A. (author), Hogervorst, M.A. (author), TNO Defensie en Veiligheid (author)
We developed a simple and fast lookup-table based method to derive and apply natural daylight colors to multi-band night-time images. The method deploys an optimal color transformation derived from a set of samples taken from a daytime color reference image. The colors in the resulting colorized multiband night-time images closely resemble the...
conference paper 2008
document
Salem, S. (author), Jacobs, E. (author), Moore, R. (author), Hogervorst, M.A. (author), Bijl, P. (author), TNO Defensie en Veiligheid (author)
Perception tests establish the effects of spatially band-limited noise and blur on human observer performance. Previously, Bijl showed that the contrast threshold of a target image with spatially band-limited noise is a function of noise spatial frequency. He used the method of adjustment to find the contrast thresholds for each noise frequency...
conference paper 2008
document
Hogervorst, M.A. (author), Toet, A. (author)
We present a fast and efficient method to derive and apply natural colors to nighttime imagery from multiband sensors. The color mapping is derived from the combination of a multiband image and a corresponding natural color reference image. The mapping optimizes the match between the multiband image and the reference image, and yields a...
conference paper 2008
document
Toet, A. (author), Hogervorst, M.A. (author), Nikolov, S.G. (author), Lewis, J.J. (author), Dixon, T.D. (author), Bull, D.R. (author), Canagarajah, C.N. (author), TNO Defensie en Veiligheid (author)
The increasing availability and deployment of imaging sensors operating in multiple spectral bands has led to a large research effort in image fusion, resulting in a plethora of pixel-level image fusion algorithms. However, the cognitive aspects of multisensor image fusion have not received much attention in the development of these methods. In...
article 2010
document
Bijl, P. (author), Reynolds, J.P. (author), Vos, W.K. (author), Hogervorst, M.A. (author), Fanning, J.D. (author)
The TTP (Targeting Task Performance) metric, developed at NVESD, is the current standard US Army model to predict EO/IR Target Acquisition performance. This model however does not have a corresponding lab or field test to empirically assess the performance of a camera system. The TOD (Triangle Orientation Discrimination) method, developed at TNO...
conference paper 2011
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Gosselink, G.A.B. (author), Anbeek, H. (author), Bijl, P. (author), Hogervorst, M.A. (author)
The Triangle Orientation Discrimination (TOD) test method was applied to characterize thermal and visual range performance of the Gatekeeper Electro Optical Security System. Gatekeeper developed by Thales Nederland BV, is currently in use with the Royal Netherlands Navy. The system houses uncooled infrared and colour TV cameras providing up to...
conference paper 2013
Searched for: subject:"Perception"
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