A New Approach To The Design Of Very High Resolution, Wide Angle Imaging Systems -- Aspheric Correctors Without Rotational Symmetry For A One-Dimensional Field-Of-View System

1974 ◽  
Author(s):  
David L. Fried
Keyword(s):  
High Resolution ◽  
Rotational Symmetry ◽  
Field Of View ◽  
Imaging Systems ◽  
Wide Angle ◽  
New Approach ◽  
One Dimensional ◽  
Very High

Very High Resolution Analysis of the Dynamics of a Coronal Plasmoid

1994 ◽  
Vol 144 ◽  
pp. 593-596
Author(s):  
O. Bouchard ◽  
S. Koutchmy ◽  
L. November ◽  
J.-C. Vial ◽  
J. B. Zirker
Keyword(s):  
High Resolution ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Field Of View ◽  
Small Field ◽  
High Resolution Analysis ◽  
Ccd Observations ◽  
Resolution Analysis ◽  
Very High ◽  
Small Field Of View

AbstractWe present the results of the analysis of a movie taken over a small field of view in the intermediate corona at a spatial resolution of 0.5“, a temporal resolution of 1 s and a spectral passband of 7 nm. These CCD observations were made at the prime focus of the 3.6 m aperture CFHT telescope during the 1991 total solar eclipse.

scholarly journals Assessment of Stereoscopic Multi-resolution Images for a Virtual Reality System

2010 ◽  
Vol 9 (2) ◽  
pp. 31-37 ◽  
Author(s):  
Masahiko Ogawa ◽  
Kazunori Shidoji ◽  
Yuji Matsuki
Keyword(s):  
High Resolution ◽  
Field Of View ◽  
Monitor System ◽  
Wide Angle ◽  
Camera System ◽  
Technical Limitation ◽  
Resolution Image ◽  
The Gaze ◽  
High Resolution Image ◽  
Perceptual Characteristics

A camera and monitor system that projects actual real-world images has yet to be developed due to the technical limitation that the existing cameras cannot simultaneously acquire high-resolution and wide-angle images. In this research, we try to resolve this issue by superimposing images; a method which is effective because the entire wide-angle image does not necessarily need to be of high resolution because of perceptual characteristics of the human visual system. First, we examined the minimum resolution required for the field of view, which indicated that a triple-resolution image where positions more than 20 and 40 deg from the center of the visual field were decreased to 25% and approximately 11% of the resolution of the gaze point, respectively, was perceived as similar to a completely high-resolution image. Next, we investigated whether the participants could distinguish between the original completely high-resolution image and processed images, which included triple-resolution, dual-resolution, and low-resolution images. Our results suggested that the participants could not differentiate between the triple-resolution image and the original image. Finally, we developed a stereoscopic camera system based on our results

Developments of X-Ray Grating Imaging Technology

2014 ◽  
Vol 898 ◽  
pp. 614-617
Author(s):  
Rui Hong Li ◽  
Yue Ping Han
Keyword(s):  
High Resolution ◽  
Imaging System ◽  
Imaging Techniques ◽  
Field Of View ◽  
Imaging Systems ◽  
Large Field ◽  
X Ray ◽  
X Ray Imaging ◽  
Angle Scattering ◽  
Interferometry Method

The present paper reviews the X-ray grating imaging systems at home and abroad from the aspects of technological characterizations and the newest researching focus. First, not only the imaging principles and the frameworks of the typical X-ray grating imaging system based on Talbot-Lau interferometry method, but also the algorithms of retrieving the signals of attenuation, refraction and small-angle scattering are introduced. Second, the system optimizing methods are discussed, which involves mainly the relaxing the requirement of high positioning resolution and strict circumstances for gratings and designing large field of view with high resolution. Third, two and four-dimensional grating-based X-ray imaging techniques are introduced.

A new approach to wide-angle dynamical X-ray diffraction by deformed crystals

2006 ◽  
Vol 39 (5) ◽  
pp. 652-655 ◽  
Author(s):  
S. G. Podorov ◽  
N. N. Faleev ◽  
K. M. Pavlov ◽  
D. M. Paganin ◽  
S. A. Stepanov ◽  
...  
Keyword(s):  
High Resolution ◽  
Diffraction Data ◽  
Diffraction Theory ◽  
Simple Approach ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
New Approach ◽  
Dynamical Diffraction ◽  
X Ray ◽  
Distorted Waves

A new approach is proposed for X-ray dynamical diffraction theory in distorted crystals. The theory allows one to perform dynamical diffraction simulations between Bragg peaks for non-ideal crystals, using a simple approach of two distorted waves. It can be directly applied for reciprocal-space simulation. The formalism is used to analyse high-resolution X-ray diffraction data, obtained for an InSb/InGaSb/InSb/InAs superlattice grown on top of a GaSb buffer layer on a (001) GaSb substrate.

Near-IR Observations of Vega-like Stars with the VLTI: β Pic, α PsA, ∊ Eri and τ Cet

2004 ◽  
Vol 219 ◽  
pp. 75-79 ◽  
Author(s):  
Emmanuel Di Folco ◽  
Pierre Kervella ◽  
Frédéric Thévenin ◽  
Pierre Morel ◽  
Armando Domiciano de Suza ◽  
...  
Keyword(s):  
High Resolution ◽  
Main Sequence ◽  
High Accuracy ◽  
Field Of View ◽  
Circumstellar Material ◽  
Near Ir ◽  
Long Baselines ◽  
Very High ◽  
Innermost Region ◽  
K Band

We have conducted K band interferometric observations of four nearby main-sequence Vega-like stars at the VLTI with very long baselines. The very high resolution allowed us to probe the innermost region of the disks, where planets are supposed to be formed. The diameters of three bright and nearby prototypes β Pictoris, Fomalhaut (α PsA) and ∊ Eridani as well as τ Ceti have been measured with VINCI, the VLTI commissioning instrument, with a high accuracy. The derived diameters were used to constrain their age with help of the evolution code CESAM. The precision achieved with VINCI allowed us to discuss the shape of their photosphere and the possible detection of warm circumstellar material within the narrow interferometric field of view.

A new approach to very high resolution mini-brain PET using a small number of large detectors

1990 ◽  
Vol 37 (2) ◽  
pp. 842-851 ◽  
Author(s):  
Z.H. Cho ◽  
S.C. Juh ◽  
R.M. Friedenberg ◽  
W. Bunney ◽  
M. Buchsbaum ◽  
...  
Keyword(s):  
High Resolution ◽  
New Approach ◽  
Brain Pet ◽  
Very High

scholarly journals Context for the ESA ExoMars rover: the Panoramic Camera (PanCam) instrument

2006 ◽  
Vol 5 (3) ◽  
pp. 269-275 ◽  
Author(s):  
Andrew D. Griffiths ◽  
Andrew J. Coates ◽  
Ralf Jaumann ◽  
Harald Michaelis ◽  
Gerhard Paar ◽  
...  
Keyword(s):  
High Resolution ◽  
Water Vapour ◽  
Field Of View ◽  
High Resolution Imaging ◽  
Wide Angle ◽  
Terrain Mapping ◽  
Camera System ◽  
Digital Terrain ◽  
Panoramic Images ◽  
Resolution Imaging

The recently approved ExoMars rover is the first element of the ESA Aurora programme and is scheduled to deliver the Pasteur exobiology payload to Mars by 2015. The 0.7 kg Panoramic Camera will provide multi-spectral stereo images with 65 ° field-of-view (1.1 mrad/pixel) and high-resolution (85 μrad/pixel) monoscopic ‘zoom’ images with 5 ° field-of-view. The stereo wide-angle cameras (WAC) are based on the Beagle 2 Stereo Camera System heritage (Griffiths et al. (2005). Planet. Space Sci. 53, 1466–1488). The Panoramic Camera instrument is designed to fulfil the digital terrain mapping requirements of the mission as well as to provide multi-spectral geological imaging, colour and stereo panoramic images, water vapour abundance and dust optical depth measurements. It can also be used for high-resolution imaging of inaccessible locations on crater walls and to observe retrieved subsurface samples before ingestion into the rest of the Pasteur payload.

scholarly journals iGen: a program for the automated generation of models and parameterisations

2011 ◽  
Vol 4 (2) ◽  
pp. 843-868 ◽  
Author(s):  
D. F. Tang ◽  
S. Dobbie
Keyword(s):  
High Resolution ◽  
Source Code ◽  
Model Development ◽  
New Approach ◽  
Physical Systems ◽  
Automated Generation ◽  
Resolution Model ◽  
High Resolution Model ◽  
High Resolution Models ◽  
Very High

Abstract. Complex physical systems can often be simulated using very high-resolution models but this is not always practical because of computational restrictions. In this case the model must be simplified or parameterised, but this is a notoriously difficult process that often requires the introduction of "model assumptions" that are hard or impossible to justify. Here we introduce a new approach to parameterising models. The approach makes use of a newly developed computer program, which we call iGen, that analyses the source code of a high-resolution model and formally derives a much faster parameterised model that closely approximates the original, reporting bounds on the error introduced by any approximations. These error bounds can be used to formally justify use of the parameterised model in subsequent numerical experiments. Using increasingly complex physical systems as examples we illustrate that iGen has the ability to produce parameterisations that run typically orders of magnitude faster than the underlying, high-resolution models from which they are derived and show that iGen has the potential to become an important tool in model development.

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