Results 21 to 30 of about 4,513 (162)
A sparsity-driven approach for joint SAR imaging and phase error correction [PDF]
, 2012 Image formation algorithms in a variety of applications have explicit or implicit dependence on a mathematical model of the observation process. Inaccuracies in the observation model may cause various degradations and artifacts in the reconstructed ...
Çetin, Müjdat, Önhon, Özben Naime
core +1 more source
Lightweight smart autofocusing eyeglasses
MOEMS and Miniaturized Systems XVII, 2018 More than 100 million people in the United States of America alone suffer from age-related presbyopia caused by a loss of focal accommodation of the eye crystalline lens as the lens stiffens with age. The resulting accommodative error or lag produces blurred images of objects placed at different distances.
N, Hasan +6 more
openaire +3 more sources
Temporal cloaking with accelerating wave packets
, 2014 We theoretically propose a temporal cloaking scheme based on accelerating wave packets. A part of a monochromatic lightwave is endowed with a discontinuous nonlinear frequency chirp, so that two opposite accelerating caustics are created in space-time as
Chremmos, Ioannis
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Joint sparsity-driven inversion and model error correction for radar imaging [PDF]
, 2009 Solution of inverse problems in imaging requires the use of a mathematical model of the observation process. However such models often involve errors and uncertainties themselves. The application of interest in this paper is synthetic aperture radar (SAR)
Cetin, Mujdat +3 more
core +2 more sources
Pre-engineered abruptly autofocusing beams [PDF]
Optics Letters, 2011 We introduce a new family of (2+1)D light beams with pre-engineered abruptly autofocusing properties. These beams have a circularly symmetric input profile that develops outward of a dark disk and oscillates radially as a sublinear-chirp signal, creating a series of concentric intensity rings with gradually decreasing width.
Chremmos, Ioannis +2 more
openaire +3 more sources
Accelerating and abruptly-autofocusing beam waves in the Fresnel zone of antenna arrays [PDF]
, 2013 We introduce the concept of spatially accelerating (curved) beam waves in the Fresnel region of properly designed antenna arrays. These are transversely localized EM waves that propagate in free space in a diffraction-resisting manner, while at the same ...
Chremmos, Ioannis +2 more
core +1 more source
ChemMedChem, Volume 21, Issue 10, 27 May 2026.A comparison of two structurally related prostate specific membrane antigen (PSMA)‐targeted fluorophores revealed that the substitution of the urea motif lysine‐urea‐glutamate (KuE) by a phosphinate leads to probes with low nanomolar PSMA‐affinity, good and specific tumor uptake, and low off‐target tissue retention in mice.
Lennart F. V. Spickschen +10 more
wiley +1 more source
Autofocusing algorithm selection in computer microscopy [PDF]
2005 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2005 Autofocusing is a fundamental technology for automated biological and biomedical analyses and is indispensable for routine use of microscopes on a large scale. This paper presents a comprehensive comparison study of 18 focus algorithms in which a total of 139,000 microscope images are analyzed.
Yu Sun 0001 +2 more
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Airy beam induced optical routing
, 2013 We present an all-optical routing scheme based simultaneously on optically induced photonic structures and the Airy beam family. The presented work utilizes these accelerating beams for the demonstration of an all-optical router with individually ...
Agrawal G. P. +4 more
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Multi-spot live-image autofocusing for high-throughput microscopy of fluorescently stained bacteria [PDF]
, 2009 Screening by automated high-throughput microscopy has become a valuable research tool. An essential component of such systems is the autonomous acquisition of focused images.
Pernthaler, J, Zeder, M
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