Searched for: subject%3A%22colour%22
(1 - 20 of 59)

Pages

document
Theelen, M.J. (author), Hagedoorn, C. (author), Götz-Köhler, M. (author), Weeber, A. (author), Neugebohn, N. (author)
Oxide/metal/oxide (OMO) layer stacks are promising replacements for conventional transparent conductive oxides in thin-film photovoltaics. They can provide colouration of the solar cells by adjusting their thickness to optimised optical resonances. Green OMO multistacks were deposited on glass by subsequent sputtering of aluminium doped zinc...
article 2021
document
Hogervorst, M.A. (author), Toet, A. (author)
Previously, we presented a method for applying daytime colours to fused nighttime (e.g., intensified and LWIR) imagery (Toet and Hogervorst, Opt.Eng. 51(1), 2012). Our colour mapping not only imparts a natural daylight appearance to multiband nighttime images but also enhances the contrast and visibility of otherwise obscured details. As a...
conference paper 2016
document
Hogervorst, M.A. (author), Kooi, F.L. (author)
Current night-time training using (flight-, driving-) simulators is hindered by the lack of realism. Effective night-time training requires the simulation of the illusions and limitations experienced while wearing Night Vision Goggles during the night. Various methods exist that capture certain sensor effects such as noise and the characteristic...
conference paper 2014
document
Torres, J. (author), Schutte, K. (author), Bouma, H. (author), Menendez, J.M. (author)
Many image processing methods, such as techniques for people re-identification, assume photometric constancy between different images. This paper addresses the correction of photometric variations based upon changes in background areas to correct foreground areas. We assume a multiple light source model where all light sources can have different...
article 2014
document
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
document
Hogervorst, M.A. (author), Jansen, C. (author), Toet, A. (author), Bijl, P. (author), Bakker, P.J. (author), Hiddema, A.C. (author), van Vliet, S.F. (author)
We present the design and evaluation of a new demonstrator rifle sight viewing system containing direct view, red aim point and fusion of an (uncooled, LWIR) thermal sensor with a digital image intensifier. Our goal is to create a system that performs well under a wide variety of (weather) conditions during daytime and nighttime and combines the...
conference paper 2012
document
Köppen, M. (author), Hirsch, M. (author), Ernst, J. (author), Vliegenthart, W.A. (author), Ye, M.Y. (author), Bykov, V. (author), Schauer, F. (author)
The stellarator Wendelstein 7-X (W7-X) is presently under construction at the Max-Planck-Institut für Plasmaphysik in Greifswald, Germany. The plasma density profile will be measured by two-colour interferometry where for each line of sight through the plasma the phase shifts of two far-infrared laser beams are compared. Due to the 3D shape of...
article 2011
document
Toet, A. (author), Hogervorst, M.A. (author), van Son, R. (author), Dijk, J. (author)
We present the design and first field trial results of an all-day all-weather enhanced and synthetic-fused multi-band colour night vision surveillance and observation system. The system augments a fused and dynamic three-band natural-colour night vision image with synthetic 3D imagery in real-time. The night vision sensor suite consists of three...
article 2011
document
de Kok, M.M. (author), Sarfert, W. (author), Paetzold, R. (author), TNO Industrie en Techniek (author)
Colour tuning of white polymer light emitting diode (LED) light sources can be attained by various methods at various stages in the production process of the lamps and/or by the design of the active material incorporated in the LEDs. In this contribution we will describe the methods and discuss the physical background of colour tuning....
article 2010
document
Burghouts, G.J. (author), Geusebroek, J.M. (author), TNO Defensie en Veiligheid (author)
In this paper, we compare local colour descriptors to grey-value descriptors. We adopt the evaluation framework of Mikolayzcyk and Schmid. We modify the framework in several ways. We decompose the evaluation framework to the level of local grey-value invariants on which common region descriptors are based. We compare the discriminative power and...
article 2009
document
Lucassen, M.P. (author), Bijl, P. (author), Roelofsen, J. (author), TNO Defensie en Veiligheid (author)
We present psychophysical data on the perception of static colored noise. In our experiments, we use the CIE94 color difference formula to quantify the noise strength and for describing our threshold data. In Experiment 1 we measure the visual detection thresholds for fixed pattern noise on a uniform background color. The noise was present in...
article 2008
document
Hogervorst, M.A. (author), Toet, A. (author), TNO Defensie en Veiligheid (author)
We present a fast and efficient method to derive and apply natural colours to nighttime imagery from multiband sensors. The colour mapping is derived from the combination of a multiband image and a corresponding daytime colour reference. The mapping optimizes the match between the multiband image and the reference, and yields a nightvision image...
conference paper 2008
document
Hogervorst, M.A. (author), Alferdinck, J.W.A.M. (author), TNO Defensie en Veiligheid (author)
Problem: colour perception of dichromats (colour-blind persons) Background: Various models have been proposed (e. g. Walraven & Alferdinck, 1997; Brettel et al. , 1997) to model reduced colour vision of colour-blind people. It is clear that colour-blind people cannot distinguish certain object colours that appear different to people with normal...
conference paper 2008
document
Huisman, D.J. (author), Pols, S. (author), Joosten, I. (author), van Os, B.J.H. (author), Smit, A. (author), TNO Bouw en Ondergrond (author)
A group of Roman glass objects from the Bocholtz burial in the SW of Limburg (The Netherlands) was found to have been subject to varying degrees of degradation. Many of the 25 colourless glass objects were fragmented to pieces <0.1 cm ("sugared"), whereas the three transparent blue-green glass objects were in near-pristine state. Analyses using...
article 2008
document
TNO Defensie en Veiligheid (author), Dijk, J. (author), den Hollander, R.J.M. (author)
Recently new techniques for night vision cameras are developed. So-called EMCCD cameras are able to record color information about the scene. However, in low-light situations this imagery becomes noisy. This is also the case for normal CCD cameras in dark situations or in shadowed areas. In this paper we present image enhancement techniques for...
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
Toet, A. (author), Hogervorst, M.A. (author), TNO Defensie en Veiligheid (author)
Recently we introduced a method for applying natural daytime colors to multi-band night-time images. In this method statistical properties of a reference daytime color image are transferred to the multi-band image. Although the method yields nice results, its practical value is limited since it is computationally expensive, and it does not...
conference paper 2007
document
Hogervorst, M.A. (author), Toet, A. (author), TNO Defensie en Veiligheid (author)
We developed a fast and efficient method to derive and apply a natural colour mapping for night-time imagery from multi-band sensors. The colour mapping is derived from the combination of a multi-band image and a corresponding natural colour reference image. The mapping optimizes the match between the multi-band image and the reference image,...
conference paper 2007
document
Lucassen, M.P. (author), Alferdinck, J.W.A.M. (author), TNO Defensie en Veiligheid (author)
We report on a dynamic simulation of defective color vision. Using an RGB video camera connected to a PC or laptop, the captured and displayed RGB colors are translated by our software into modified RGB values that simulate the color appearance of a person with a color deficiency. Usually, the simulation of deficient color vision is restricted...
conference paper 2006
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
Searched for: subject%3A%22colour%22
(1 - 20 of 59)

Pages