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Alferdinck, J.W.A.M. (author), Kroon, E.C.M. (author), Hogervorst, M.A. (author), van der Horst, A.R.A. (author)
report 2013
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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
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Alferdinck, J.W.A.M. (author), Hogervorst, M.A. (author)
Light sources that are optimized for mesopic vision contain a relatively high amount of bluish light (high S/P-ratio) and are therefore effective for peripheral visual tasks at mesopic light levels. Since the spectra of these light sources differ strongly from the common public lighting there were doubts on the performance of these light sources...
conference paper 2013
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Alferdinck, J.W.A.M. (author), Hogervorst, M.A. (author)
Purpose : According to international legislation pilothouse windows of inland vessels should have a minimum light transmission of 75%. The shipping sector is wondering whether this requirement can be reduced since a large portion of the fleet is equipped with green tinted windows panes with a lower light transmission. In this study, we answer...
report 2013
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Hogervorst, M.A. (author), Toet, A. (author), Bijl, P. (author)
We investigate how human visual search performance with field of view (FOV) restrictions depends on scan speed, zoom factor, target location, and conspicuity. First, observers search a FOV that moves at a constant speed along a predefined path over a visual search scene (the field of regard, or FOR), and we measure the effects of scan speed,...
article 2013
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Toet, A. (author), Hogervorst, M.A. (author)
We present a new method to derive a multiscale urban camouflage pattern from a given set of background image samples. We applied this method to design a camouflage pattern for a given (semi-arid) urban environment. We performed a human visual search experiment and a computational evaluation study to assess the effectiveness of this multiscale...
article 2013
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Bijl, P. (author), Hogervorst, M.A. (author)
The MRTD and MRC end-to-end EO/IR system tests and corresponding models, described in NATO STANAGs 4347-4351, lead to incorrect Target Acquisition (TA) range predictions for modern imaging systems that are 1) usually under-sampled and/or 2) contain complex signal processing. Considerable efforts have been made to develop tests and models that...
conference paper 2012
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Toet, A. (author), Hogervorst, M.A. (author)
We present an overview of our recent progress and the current state-of-the-art techniques of color image fusion for night vision applications. Inspired by previously developed color opponent fusing schemes, we initially developed a simple pixel-based false color-mapping scheme that yielded fused false color images with large color contrast and...
article 2012
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Brouwer, A.M. (author), Hogervorst, M.A. (author), van Erp, J.B.F. (author), Heffelaar, T. (author), Zimmerman, P.H. (author), Oostenveld, R. (author)
Previous studies indicate that both EEG spectral power (in particular the alpha and theta band) and ERPs (in particular the P300) can be used as a measure of mental work or memory load. We compare their ability to estimate workload level in a well-controlled task. In addition, we combine both types of measures in a single classification model to...
article 2012
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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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Hogervorst, M.A. (author), Toet, A. (author), Jacobs, P. (author), TNO Defensie en Veiligheid (author)
An international group consisting of several NATO nations participated in a trial in which urban camouflage was developed and compared. First, photographs were taken in and around a small town (arid climate). Next, the different groups derived urban camouflage patterns from these photographs. We applied our method for deriving a camouflage...
conference paper 2010
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Toet, A. (author), Hogervorst, M.A. (author), TNO Defensie en Veiligheid (author)
bookPart 2010
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