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Chen, Y. (author)This thesis presents the development of low-noise CMOS image sensors for radio-molecular imaging. The development is described in two directions: firstly, from the technology point of view to reduce the pixel noise level, and secondly from the design point of view to reduce the pixel readout circuits noise level. With respect to the SNR and...doctoral thesis 2012
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Lynch, K.P. (author), Fahringer, T. (author), Thurow, B. (author)A novel 3-D, 3-C PIV technique is described, based on volume illumination and a plenoptic camera to measure a velocity field. The technique is based on plenoptic photography, which uses a dense microlens array mounted near a camera sensor to sample the spatial and angular distribution of light entering the camera. Various algorithms are then...conference paper 2012
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Korkiakoski, V. (author), Keller, C.U. (author), Doelman, N. (author), Fraanje, P.R. (author), Verhaegen, M.H.G. (author)We study different possibilities to use adaptive optics (AO) and phase diversity (PD) together in a jointly optimized system. The potential of the joint system is demonstrated through numerical simulations. We find that the most significant benefits are obtained from the improved deconvolution of AO-corrected wavefronts and the additional...journal article 2011
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Ellenbroek, R.M.L. (author)The refractive index of air varies a.o. with temperature, humidity, pressure and the CO2 concentration. Due to atmospheric turbulence this refractive index varies both in space and in time, leading to aberrations in images of light having passed though it. These aberrations limit the achievable resolution of optical telescopes such that the...doctoral thesis 2011
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Chen, Y. (author), Theuwissen, A.J.P. (author), Chae, Y. (author)This paper presents a low noise CMOS image sensor (CIS) using 10/12 bit configurable column-parallel single slope ADCs (SS-ADCs) and digital correlated multiple sampling (CMS). The sensor used is a conventional 4T active pixel with a pinned-photodiode as photon detector. The test sensor was fabricated in a 0.18 colonm CMOS image sensor process...journal article 2011
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Xie, N. (author), Theuwissen, A.J.P. (author)Micro-Digital Sun Sensor (?DSS) is a sun detector which senses the respective angle between a satellite and the sun. It is composed of a solar cell power supply, a RF communication block and a CMOS Image Sensor (CIS) chip, which is called APS+. The paper describes the implementation of a prototype of the ?DSS APS+ processed in a standard 0.18?m...conference paper 2011
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Carvalho, D.D.B. (author), Klein, S. (author), Akkus, Z. (author), Ten Kate, G.L. (author), Schinkel, A.F.L. (author), Bosch, J.G. (author), Van der Lugt, A. (author), Niessen, W.J. (author)Purpose The purpose of this paper is to present a methodology to estimate the carotid artery lumen centerlines in ultrasound (US) images obtained in a free-hand examination. Challenging aspects here are speckle noise in US images, artifacts, and the lack of contrast in the direction orthogonal to the US beam direction. Method An algorithm based...journal article 2011
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Mata Pavia, J. (author), Charbon, E. (author), Wolf, M. (author)An imager for optical tomography was designed based on a detector with 128x128 single-photon pixels that included a bank of 32 time-to-digital converters. Due to the high spatial resolution and the possibility of performing time resolved measurements, a new contact-less setup has been conceived in which scanning of the object is not necessary....conference paper 2011
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Song, H. (author)Adaptive optics (AO), also called as Smart Optics, has received increasing attention in the past decades. The main idea behind AO is to actively sense and compensate the optical aberration in the system such that the image resolution is improved or the light beam is well focused. The applications of AO include ground-based telescopes, scanning...doctoral thesis 2011
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Arslan, A. (author), Ishihara, R. (author), Derakhshandeh, J. (author), Beenakker, C.I.M. (author)Design, fabrication and measurement results of single grain (SG) lateral PIN photodiodes and SG thin film transistors (TFT) are reported in this paper. Devices were developed to be used in indirect X-ray image sensor pixel design. We have controlled position of 6 ?m x 6 ?m silicon grains with excimer-laser crystallization of a-Si film. Lateral...conference paper 2011
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Nampoothiri, G.G. (author), Horemans, M.L.R. (author), Theuwissen, A.J.P. (author)We analyze the “ageing” effect on image sensors introduced by neutrons present in natural (terrestrial) cosmic environment. The results obtained at sea level are corroborated for the first time with accelerated neutron beam tests and for various image sensor operation conditions. The results reveal many fascinating effects that these rays...conference paper 2011
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Sarkar, M. (author)Biological systems are a source of inspiration in the development of small autonomous sensor nodes. The two major types of optical vision systems found in nature are the single aperture human eye and the compound eye of insects. The latter are among the most compact and smallest vision sensors. The eye is a compound of individual lenses with...doctoral thesis 2011
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Gersbach, M. (author), Trimananda, R. (author), Maruyama, Y. (author), Fishburn, M. (author), Cahrbon, E. et al (author)Imaging techniques based on time-correlated single photon counting (TCSPC), such as fluorescence lifetime imaging microscopy (FLIM), rely on fast single-photon detectors as well as timing electronics in the form of time-to-digital or time-to-analog converters. Conventional systems rely on stand-alone or small arrays (up to 32) of detectors and...conference paper 2010
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Sarkaer, M. (author), San Segundo Bello, D. (author), Van Hoof, C. (author), Theuwissen, A. (author)The navigational strategies of insects using skylight polarization are interesting for applications in autonomous agent navigation because they rely on very little information for navigation. A polarization navigation sensor using the Stokes parameters to determine the orientation is presented. The working principle of the sensor is based on...journal article 2010
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Song, H. (author), Fraanje, R. (author), Schitter, G. (author), Kroese, H. (author), Vdovin, G. (author), Verhaegen, M. (author)In many scientific and medical applications, such as laser systems and microscopes, wavefront-sensor-less (WFSless) adaptive optics (AO) systems are used to improve the laser beam quality or the image resolution by correcting the wavefront aberration in the optical path. The lack of direct wavefront measurement in WFSless AO systems imposes a...journal article 2010
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Moens, E. (author), Meuret, Y. (author), Ottevaere, H. (author), Sarkar, M. (author), San Segundo Bello, D. (author), Merken, P. (author), Thienpont, H. (author)In this paper we discuss the design of a novel miniaturized image sensor based on the working principle of insect facet eyes. The main goals are to design an imaging system which captures a large field of view (FOV) and to find a good trade-off between image resolution and sensitivity. To capture a total FOV of 124°, we split up this FOV into 25...conference paper 2010
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Chen, Y. (author), Wang, X. (author), Mierop, A.J. (author), Theuwissen, A.J.P. (author)This paper presents a CMOS imager sensor with pinned-photodiode 4T active pixels which use in-pixel buried-channel source followers (SFs) and optimized row selectors. The test sensor has been fabricated in a 0.18-mum CMOS process. The sensor characterization was carried out successfully, and the results show that, compared with a regular imager...journal article 2009
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Caarls, J. (author)In this thesis we introduce the reader to the field of Augmented Reality (AR) and describe aspects of an AR system. We show the current uses in treatment of phobias, games, sports and industry. We present the challenges for Optical See-Through Augmented Reality in which the real world is perceived normally by the user and is augmented with...doctoral thesis 2009
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Ramachandra Rao, P. (author)The aim of this thesis was twofold: investigating the effect of ionizing radiation on 4-T CMOS image sensors and the possibility of realizing a CCD like sensor in standard 0.18-?m CMOS technology (for medical applications). Both the aims are complementary; borrowing and lending many aspects of radiation and device physics amongst each other.doctoral thesis 2009
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Dijk, J. (author), Van Eekeren, A.W.M. (author), Schutte, K. (author), De Lange, D.J.J. (author), Van Vliet, L.J. (author)When bright moving objects are viewed with an electro-optical system at very long range, they will appear as small slightly blurred moving points in the recorded image sequence. Detection of point targets is seriously hampered by structure in the background, temporal noise and aliasing artifacts due to undersampling by the infrared (IR) sensor....conference paper 2009