Searched for: subject%3A%22Image%255C%2Benhancement%22
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Mirahmadi, F. (author), Koolstra, J.H. (author), Fazaeli, S. (author), Lobbezoo, F. (author), van Lenthe, G.H. (author), Snabel, J. (author), Stoop, R. (author), Everts, V. (author)
Nutrition of articular cartilage relies mainly on diffusion and convection of solutes through the interstitial fluid due to the lack of blood vessels. The diffusion is controlled by two factors: steric hindrance and electrostatic interactions between the solutes and the matrix components. Aging comes with changes in the cartilage structure and...
article 2019
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Khenkin, M.V. (author), Anoop, K.M. (author), Visoly-Fisher, I. (author), Galagan, Y. (author), Di Giacomo, F. (author), Patil, B.R. (author), Sherafatipour, G. (author), Turkovic, V. (author), Rubahn, H.G. (author), Madsen, M. (author), Merckx, T. (author), Uytterhoeven, G. (author), Bastos, J.P.A. (author), Aernouts, T. (author), Brunetti, F. (author), Lira-Cantu, M. (author), Katz, E.A. (author)
The development of hybrid organic-inorganic halide perovskite solar cells (PSCs) that combine high performance and operational stability is vital for implementing this technology. Recently, reversible improvement and degradation of PSC efficiency have been reported under illumination-darkness cycling. Quantifying the performance and stability of...
article 2018
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Nieuwenhuizen, R.P.J. (author), Bouwman, D.D. (author), Schutte, K. (author)
High resolution images are critical for a wide variety of military detection, recognition and identification tasks. Super-resolution reconstruction algorithms aim to enhance the image resolution beyond the capability of the imaging system being used. Until recently, undersampling of the optical signal on the image sensor has been the key factor...
conference paper 2018
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Nieuwenhuizen, R.P.J. (author), Kruithof, M. (author), Schutte, K. (author)
High resolution imagery is of crucial importance for the performance on visual recognition tasks. Super-resolution (SR) reconstruction algorithms aim to enhance the image resolution beyond the capability of the image sensor being used. Traditional SR algorithms approach this inverse problem using physical models for the image formation combined...
conference paper 2017
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Toet, A. (author)
Edge preserving filters aim to simplify the representation of images (e.g., by reducing
article 2016
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Toet, A. (author), Wu, T. (author)
A simple power-logarithm histogram modification operator is proposed to enhance infrared (IR) image contrast. The algorithm combines a logarithm operator that smoothes the input image histogram while retaining the relative ordering of the original bins, with a power operator that restores the smoothed histogram to an approximation of the original...
article 2015
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Dijk, J. (author), van Eekeren, A.W.M. (author), Toet, A. (author), den Hollander, R.J.M. (author), Schutte, K. (author), van Heijningen, A.W.P. (author), Bijl, P. (author)
For many military operations, situational awareness is of great importance. During night conditions, this situational awareness can be improved using both analog and digital image-intensified cameras. The quality of image intensifiers is a topic of interest. One of the differences between a digital and analog system is noise behavior. For...
article 2013
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Tchebotareva, A. (author), Schols, R.M. (author), Wieringa, F.P. (author), Alić, L. (author), Bouvy, N. (author), Stassen, L.P.S. (author), van de Steeg, E. (author), Klomp, D. (author), Baumer, S. (author), Statham, A. (author), Dunias, P. (author)
One of the challenges during surgery is to make a proper distinction between vital tissues, structures and organs, both at the surface of the exposed area and beneath it. Currently, identification of different tissue types relies either on the skills and anatomical knowledge of the surgeon (e.g., nerves, blood vessels, different tissue types),...
conference paper 2013
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Dijk, J. (author), van Eekeren, A.W.M. (author), Rajadell Rojas, O. (author), Burghouts, G.J. (author), Schutte, K. (author)
Surveillance and reconnaissance tasks are currently often performed using an airborne platform such as a UAV. The airborne platform can carry different sensors. EO/IR cameras can be used to view a certain area from above. To support the task from the sensor analyst, different image processing techniques can be applied on the data, both in real...
conference paper 2013
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Schwering, P.B.W. (author), Kemp, R.A.W. (author), Schutte, K. (author)
Recognition and identification ranges are limited to the quality of the images. Both the received contrast and the spatial resolution determine if objects are recognizable. Several aspects affect the image quality. First of all the sensor itself. The image quality depends on the size of the infrared detector array and the sensitivity. Second,...
conference paper 2013
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Bouma, H. (author), Dijk, J. (author), van Eekeren, A.W.M. (author)
Blur estimation is an important technique for super resolution, image restoration, turbulence mitigation, deblurring and autofocus. Low-cost methods have been proposed for blur estimation. However, they can have large stochastic errors when computed close to the edge location and biased estimates at other locations. In this paper, we define an...
conference paper 2012
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TNO Defensie en Veiligheid (author), Dijk, J. (author), Bijl, P. (author), van Eekeren, W.M. (author)
Recently new techniques for night-vision cameras are developed. Digital image-intensifiers are becoming available on the market. Also, so-called EMCCD (electro-magnified) cameras are developed, which can also record imagery in dim conditions. In this paper we present data recorded with both types of cameras (image-intensifiers and EMCCD cameras)...
conference paper 2010
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TNO Defensie en Veiligheid (author), Schwering, P.B.W. (author), van den Broek, S.P. (author), Kemp, R.A.W. (author), Lensen, H.A. (author)
Present-day naval operations take place in coastal environments as well as narrow straits all over the world. Coastal environments around the world are exhibiting a number of threats to naval forces. In particular, a large number of asymmetric threats can be present in environments with cluttered backgrounds as well as rapidly varying...
conference paper 2010
document
TNO Defensie en Veiligheid (author), Toet, A. (author), Hogervorst, M.A. (author), Dijk, J. (author), van Son, R. (author)
We present the design and first field trial results of the all-day all-weather INVIS Integrated Night Vision surveillance and observation System. The INVIS augments a dynamic three-band false-color nightvision image with synthetic 3D imagery in a real-time display. The night vision sensor suite consists of three cameras, respectively sensitive...
conference paper 2010
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TNO Defensie en Veiligheid (author), Dijk, J. (author), Schutte, K. (author), Toet, A. (author), Hogervorst, M.A. (author)
We present the design and first field trial results of the INVIS integrated night vision surveillance and observation system, in particular for the image enhancement techniques implemented. The INVIS is an all-day-andnight all-weather navigation and surveillance tool, combining three-band cameras. We present a processing pipeline for this system...
conference paper 2010
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TNO Defensie en Veiligheid (author), Pinkus, A.R. (author), Toet, A. (author), Task, H.L. (author)
This effort we acquired and registered a multi-spectral dynamic image test set with the intent of using the imagery to assess the operational effectiveness of static and dynamic image fusion techniques for a range of relevant military tasks. This paper describes the image acquisition methodology, the planned human visual performance task...
conference paper 2009
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TNO Defensie en Veiligheid (author), Strijbosch, V. (author), Schwering, P.B.W. (author), Kemp, R. (author)
In de Golf van Aden nabij de kust van Somalië vaart een bootje richting Hr.Ms. Evertsen die op dat moment net buiten de territoriale wateren patrouilleert. Door het slechte weer en de afstand van enkele kilometers kunnen de operators lastig zien om wat voor vaartuig het gaat. Zijn het piraten of is het gewoon een vissersbootje? Dragen de...
article 2009
document
TNO Defensie en Veiligheid (author), Dijk, J. (author), Bijl, P. (author), Bouma, H. (author)
Recently new techniques for night-vision cameras are developed. Digital image-intensifiers are becoming available on the market. Also, so-called EMCCD cameras are developed, which may even be able to record color information about the scene. However, in low-light situations all night-vision imagery becomes noisy. In this paper we evaluate the...
conference paper 2009
document
TNO Defensie en Veiligheid (author), Schwering, P.B.W. (author), Lensen, H.A. (author), van den Broek, S.P. (author), den Hollander, R.J.M. (author), van der Mark, W. (author), Bouma, H. (author), Kemp, R.A.W. (author)
In a harbor environment threats like explosives-packed rubber boats, mine-carrying swimmers and divers must be detected in an early stage. This paper describes the integration and use of a heterogeneous multiple camera system with panoramic observation capabilities for detecting these small vessels in the Den Helder New Harbor in the Netherlands...
conference paper 2009
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Hogervorst, M.A. (author), van Damme, W.J.M. (author), TNO Defensie en Veiligheid (author)
Purpose. The purpose of our study was to develop a tool to visualize the limitations posed by visual impairments in detecting small and low-contrast elements in natural images. This visualization tool incorporates existing models of several aspects of visual perception, such as the band-limited contrast model of Peli (J Opt Soc Am A 1996;13:1131...
article 2008
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