منابع مشابه
An investigation of lucky imaging techniques
We present an empirical analysis of the effectiveness of frame selection (also known as Lucky Imaging) techniques for high resolution imaging. A high-speed image recording system has been used to observe a number of bright stars. The observations were made over a wide range of values of D/r0 and exposure time. The improvement in Strehl ratio of the stellar images due to aligning frames and sele...
متن کاملAstraLux: the Calar Alto Lucky Imaging Camera
AstraLux is the Lucky Imaging camera for the Calar Alto 2.2-m telescope, based on an electron-multiplying high speed CCD. By selecting only the best 1-10% of several thousand short exposure frames, AstraLux provides nearly diffraction limited imaging capabilities in the SDSS i’ and z’ filters over a field of view of 24×24 arcseconds. By choosing commercially available components wherever possib...
متن کاملLucky imaging and aperture synthesis with low-redundancy apertures.
Lucky imaging, used with some success in astronomical and even horizontal-path imaging, relies on fleeting conditions of the atmosphere that allow momentary improvements in image quality, at least in portions of an image. Aperture synthesis allows a larger aperture and, thus, a higher-resolution imaging system to be synthesized through the superposition of image spatial-frequency components gat...
متن کاملAn Efficient Lucky Imaging System for Astronomical Image Restoration
The resolution of astronomical imaging from large optical telescopes is usually limited by the blurring effects of refractive index fluctuations in the Earth’s atmosphere. In this paper, we develop a lucky imaging system to restore astronomical images through atmosphere turbulence on 1.23m telescope. Our system takes very short exposures, on the order of the atmospheric coherence time. The rapi...
متن کاملLucky Factors
We propose a new method to select amongst a large group of candidate factors — many of which might arise as a result of data mining — that purport to explain the cross-section of expected returns. The method is robust to general distributional characteristics of both factor and asset returns. We allow for the possibility of time-series as well as cross-sectional dependence. The technique accomm...
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ژورنال
عنوان ژورنال: Perception
سال: 2008
ISSN: 0301-0066,1468-4233
DOI: 10.1068/p3709ed