Results 1 to 10 of about 30,402 (119)
Imaging Stars with Quantum Error Correction
Physical Review Letters, 2022 comments are ...
Huang, Z., Brennen, G.K., Ouyang, Y.
openaire +4 more sources
Quantum-accelerated imaging of N stars [PDF]
Optics Letters, 2021 Imaging point sources with low angular separation near or below the Rayleigh criterion are important in astronomy, e.g., in the search for habitable exoplanets near stars. However, the measurement time required to resolve stars in the sub-Rayleigh region via traditional direct imaging is usually prohibitive. Here we propose quantum-accelerated imaging (
Fanglin Bao +3 more
openaire +3 more sources
Blurred Star Image Processing for Star Sensors under Dynamic Conditions [PDF]
Sensors, 2012 The precision of star point location is significant to identify the star map and to acquire the aircraft attitude for star sensors. Under dynamic conditions, star images are not only corrupted by various noises, but also blurred due to the angular rate of the star sensor.
Weina Zhang, Wei Quan, Lei Guo
openaire +3 more sources
Infrared imaging of late-type stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1996 Infrared imaging properties of dusty winds around late-type stars are investigated in detail, employing a self-consistent model that couples the equations of motion and radiative transfer. Because of general scaling properties, the angular profiles of surface brightness are self-similar. In any given star, the profile shape is determined essentially by
Ivezic, Zeljko, Elitzur, Moshe
openaire +2 more sources
Processing Centroids of Smearing Star Image of Star Sensor [PDF]
Mathematical Problems in Engineering, 2014 A novel method was presented for increasing the accuracy of subpixel centroid estimation for smearing star image. Model of the smearing trajectory of smearing star was built. It helped to study the analytical form of the errors, caused by image smearing, for centroid estimation.
Yufu Liao +3 more
openaire +1 more source
Star test image-sampling polarimeter
Optics Express, 2016 We present an analysis and test of an image sampling polarimeter based on the concept of Star Test Polarimetry first introduced by Ramkhalawon. The method makes use of a stress engineered optical element (SEO) placed in the pupil plane of an optical system to induce a polarization dependent point spread function (PSF) at the detector.
Brandon G, Zimmerman, Thomas G, Brown
openaire +2 more sources
Imaging the Secondary Stars in Cataclysmic Variables [PDF]
, 2001 The secondary, Roche-lobe filling stars in cataclysmic variables (CVs) are key to our understanding of the origin, evolution and behaviour of this class of interacting binary. We review the basic properties of the secondary stars in CVs and the observational and analysis methods required to detect them.
Dhillon, V.S., Watson, C.A.
openaire +3 more sources
Single TrAjectory Radial (STAR) imaging [PDF]
Magnetic Resonance in Medicine, 2004 AbstractThe number of MRI applications that use radial k‐space data acquisition have been increasing because of their inherent robustness to motion‐induced reconstruction image artifacts relative to Cartesian acquisition methods. However, images reconstructed from radial data are more prone to image degrading effects due to magnetic field ...
openaire +2 more sources
Polarization images of solitonic boson stars
The European Physical Journal CAbstract This study investigates the polarization characteristics of solitonic boson stars surrounded by a thin accretion disk. By comparing their polarization images with corresponding optical images, we find a positive correlation between the polarization intensity distribution in the polarization images and the brightness in the ...
Xiao-Xiong Zeng +3 more
openaire +2 more sources
Geodesic star convexity for interactive image segmentation
2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2010 In this paper we introduce a new shape constraint for interactive image segmentation. It is an extension of Veksler's [25] star-convexity prior, in two ways: from a single star to multiple stars and from Euclidean rays to Geodesic paths. Global minima of the energy function are obtained subject to these new constraints.
Gulshan, V +5 more
openaire +1 more source