Tools
Sorted by:
Try your query at:
 |
 |
 |
 |
 |
 |
Results 1 - 10
of
181
DYNAMICS AND CONTROL OF A 25-METER APERTURE VIRTUAL STRUCTURE GOSSAMER TELESCOPE IN GEO*
"... This paper presents an architecture and case study for a large 24 meter aperture telescope concept based on separate free-flying telescope elements orbiting in GEO. An architecture is first given for the overall end-to-end guidance and control system. The integrated dynamics, estimation and control ..."
Abstract
- Add to MetaCart
This paper presents an architecture and case study for a large 24 meter aperture telescope concept based on separate free-flying telescope elements orbiting in GEO. An architecture is first given for the overall end-to-end guidance and control system. The integrated dynamics, estimation and control
Aperture Based Selection for Immersive Virtual Environments
"... We present two novel techniques for effectively selecting objects in immersive virtual environments using a single 6 DOF magnetic tracker. These techniques advance the state of the art in that they exploit the participant's visual frame of reference and fully utilize the position and orientatio ..."
Abstract
-
Cited by 69 (1 self)
- Add to MetaCart
-manipulation, 3D widgets. INTRODUCTION Selection techniques indicate to an application which object or objects a participant wishes to interact with in a virtual environment (VE). We present two novel techniques for selecting objects in a VE called aperture and orientation. The techniques apply to our test
High Directive Antenna with Virtual Aperture
"... Title High directive antenna with virtual aperture ..."
Lensless imaging with a controllable aperture
- In CVPR
, 2006
"... In this paper we propose a novel, highly flexible camera. The camera consists of an image detector and a special aperture, but no lens. The aperture is a set of parallel light attenuating layers whose transmittances are controllable in space and time. By applying different transmittance patterns to ..."
Abstract
-
Cited by 37 (2 self)
- Add to MetaCart
of lensless imaging using controllable apertures. 1. Lensless Imaging with Apertures Virtually all cameras today have lenses. Lenses are useful as they focus the light from the scene on the image plane to form bright and sharp images. We are so accustomed to cameras with lenses that we often overlook
Synthetic Aperture Techniques with a Virtual Source Element
"... Abstract-A new imaging technique has been proposed that combines conventional B-mode and synthetic aperture imaging techniques to overcome the limited depth of field for a highly focused transducer. The new technique improves lateral resolution beyond the focus of the transducer by considering the ..."
Abstract
- Add to MetaCart
the focus a virtual element and applying synthetic aperture focusing techniques. In this paper, the use of the focus as a virtual element is examined, considering the issues that are of concern when imaging with an array of actual elements: the tradeoff between lateral resolution and sidelobe level
Improving the virtual source method by wavefield separation
- Geophysics
, 2007
"... The virtual source method has recently been proposed to image and monitor below complex and time-varying over-burden. The method requires surface shooting recorded at downhole receivers placed below the distorting or changing part of the overburden. Redatuming with the measured Green’s function allo ..."
Abstract
-
Cited by 95 (20 self)
- Add to MetaCart
allows the reconstruction of a complete downhole survey as if the sources were also buried at the re-ceiver locations. There are still some challenges that need to be addressed in the virtual source method, such as limited ac-quisition aperture and energy coming from the overburden. We demonstrate
Synthetic Aperture Confocal Imaging
- ACM Trans. Graph
, 2004
"... Confocal microscopy is a family of imaging techniques that employ focused patterned illumination and synchronized imaging to create cross-sectional views of 3D biological specimens. In this paper, we adapt confocal imaging to large-scale scenes by replacing the optical apertures used in microscopy w ..."
Abstract
- Add to MetaCart
Confocal microscopy is a family of imaging techniques that employ focused patterned illumination and synchronized imaging to create cross-sectional views of 3D biological specimens. In this paper, we adapt confocal imaging to large-scale scenes by replacing the optical apertures used in microscopy
Synthetic Aperture Confocal Imaging
"... Figure 1: The techniques in this paper employ two computer-assisted optical effects: synthetic aperture photography and synthetic aperture illumination. On the left, we aim a camera at an array of planar mirrors, yielding 22 different views of a statuette partially obscured by a plant. By rectifying ..."
Abstract
- Add to MetaCart
Figure 1: The techniques in this paper employ two computer-assisted optical effects: synthetic aperture photography and synthetic aperture illumination. On the left, we aim a camera at an array of planar mirrors, yielding 22 different views of a statuette partially obscured by a plant
CWP-798 Optimized 3D synthetic aperture CSEM
"... Locating hydrocarbon reservoirs has become more challenging with smaller, deeper or shallower targets in complicated environments. Controlled-source elec-tromagnetics (CSEM) is one geophysical method used by industry to find and derisk reservoirs in marine settings. The diffusive nature of CSEM fiel ..."
Abstract
- Add to MetaCart
fields means the signal from the target is only a small part of the total field. To reduce the impact of the complicated settings and improve the detecting capabilities of CSEM, we apply synthetic aperture to CSEM data. Synthetic aperture virtually increases the length and width of the CSEM source
Optimized 3D synthetic aperture for controlled-source electromagnetics
"... Locating offshore hydrocarbon reservoirs has become more challenging with smaller, deeper, or shallow-water targets in complicated environments. Controlled-source electromag-netics (CSEM) is a geophysical method used to find reservoirs in marine settings. The diffusive nature of CSEM fields means th ..."
Abstract
- Add to MetaCart
that the signal from the target is only a small part of the total field. To reduce the impact of the complicated settings and to improve the detecting capabilities of CSEM, we have applied a synthetic aperture to CSEM data. The synthetic aperture vir-tually increased the length and width of the CSEM source
Results 1 - 10
of
181
