Results 1 - 10 of 1,244

Surround-screen projection-based virtual reality: The design and implementation of the CAVE

by Carolina Cruz-neira, Daniel J. Sandin, Thomas A. Defanti , 1993
"... Abstract Several common systems satisfy some but not all of the VR This paper describes the CAVE (CAVE Automatic Virtual Environment) virtual reality/scientific visualization system in detail and demonstrates that projection technology applied to virtual-reality goals achieves a system that matches ..."
Abstract - Cited by 725 (27 self) - Add to MetaCart
the quality of workstation screens in terms of resolution, color, and flicker-free stereo. In addition, this format helps reduce the effect of common tracking and system latency errors. The off-axis perspective projection techniques we use are shown to be simple and straightforward. Our techniques for doing

FAST VOLUME RENDERING USING A SHEAR-WARP FACTORIZATION OF THE VIEWING TRANSFORMATION

by Philippe G. Lacroute , 1995
"... Volume rendering is a technique for visualizing 3D arrays of sampled data. It has applications in areas such as medical imaging and scientific visualization, but its use has been limited by its high computational expense. Early implementations of volume rendering used brute-force techniques that req ..."
Abstract - Cited by 542 (2 self) - Add to MetaCart
casting algorithms because the latter must perform analytic geometry calculations (e.g. intersecting rays with axis-aligned boxes). The new scanline-order algorithm simply streams through the volume and the image in storage order. We describe variants of the algorithm for both parallel and perspective

Post-correlation filtering techniques for off-axis source and RFI removal

by A. R. Offringa, A. G. De Bruyn, S. Zaroubi
"... Techniques to improve the data quality of interferometric radio observations are considered. Fundaments of fringe frequencies in the uv-plane are discussed and filters are used to attenuate radio-frequency interference (RFI) and off-axis sources. Several new applications of filters are introduced an ..."
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Techniques to improve the data quality of interferometric radio observations are considered. Fundaments of fringe frequencies in the uv-plane are discussed and filters are used to attenuate radio-frequency interference (RFI) and off-axis sources. Several new applications of filters are introduced

Vehicle segmentation and tracking from a low-angle off-axis camera

by Neeraj K. Kanhere, Shrinivas J. Pundlik, Stanley T. Birchfield - In IEEE Conference on Computer Vision and Pattern Recognition , 2005
"... We present a novel method for visually monitoring a highway when the camera is relatively low to the ground and on the side of the road. In such a case, occlusion and the perspective effects due to the heights of the vehicles cannot be ignored. Features are detected and tracked throughout the image ..."
Abstract - Cited by 28 (7 self) - Add to MetaCart
, a key part of the technique. Experimental results on several different highways demonstrate the system’s ability to successfully segment and track vehicles at low angles, even in the presence of severe occlusion and significant perspective changes. 1

Single-Image Calibration of Off-Axis Catadioptric Cameras Using Lines

by Vincenzo Caglioti, Pierluigi Taddei, Giacomo Boracchi, Simone Gasparini, Ro Giusti
"... We present a novel calibration method for off-axis catadioptric cameras, i.e. standard perspective cameras placed in a generic position w.r.t. an axial-symmetric mirror of unknown shape. The proposed method estimates the intrinsic parameters of the natural perspective camera, the 3D shape of the mir ..."
Abstract - Cited by 10 (0 self) - Add to MetaCart
We present a novel calibration method for off-axis catadioptric cameras, i.e. standard perspective cameras placed in a generic position w.r.t. an axial-symmetric mirror of unknown shape. The proposed method estimates the intrinsic parameters of the natural perspective camera, the 3D shape

Supporting Multiple Off-Axis Viewpoints at a Tabletop Display

by Mark Hancock, Sheelagh Carpendale - 2007. Second IEEE International Workshop on Horizontal Interactive HumanComputer Systems
"... A growing body of research is investigating the use of tabletop displays, in particular to support collaborative work. People often interact directly with these displays, typically with a stylus or touch. The current common focus of limiting interaction to 2D prevents people from performing actions ..."
Abstract - Cited by 6 (2 self) - Add to MetaCart
that compensates for off-axis viewing for a single user and extend this technique for multiple viewers interacting with the same large display. We describe several implications of our approach to collaborative activities. We also describe other display configurations for which our technique may prove useful

Outlier detection for high dimensional data

by Charu C. Aggarwal , 2001
"... The outlier detection problem has important applications in the eld of fraud detection, netw ork robustness analysis, and intrusion detection. Most suc h applications are high dimensional domains in whic hthe data can con tain hundreds of dimensions. Many recen t algorithms use concepts of pro ximit ..."
Abstract - Cited by 235 (4 self) - Add to MetaCart
outlier from the perspective ofproximity-based de nitions. Consequently, for high dimensional data, the notion of nding meaningful outliers becomes substantially more complex and non-obvious. In this paper, w e discuss new techniques for outlier detection whic h nd the outliers by studying the behavior

Recovering 3D Shape and Motion from Image Streams using Non-Linear Least Squares

by Richard Szeliski, Sing Bing Kang , 1993
"... The simultaneous recovery of 3D shape and motion from image sequences is one of the more difficult problems in computer vision. Classical approaches to the problem rely on using algebraic techniques to solve for these unknowns given two or more images. More recently, a batch analysis of image stream ..."
Abstract - Cited by 215 (33 self) - Add to MetaCart
streams (the temporal tracks of distinguishable image features) under orthography has resulted in highly accurate reconstructions. We generalize this approach to perspective projection and partial or uncertain tracks by using a non-linear least squares technique. While our approach requires iteration

DOI: 10.1109/ICCV.2007.4409192 Single-Image Calibration of Off-Axis Catadioptric Cameras Using Lines

by Vincenzo Caglioti, Pierluigi Taddei, Giacomo Boracchi, Simone Gasparini, Ro Giusti , 2011
"... We present a novel calibration method for off-axis catadioptric cameras, i.e. standard perspective cameras placed in a generic position w.r.t. an axial-symmetric mirror of unknown shape. The proposed method estimates the intrinsic parameters of the natural perspective camera, the 3D shape of the mir ..."
Abstract - Add to MetaCart
We present a novel calibration method for off-axis catadioptric cameras, i.e. standard perspective cameras placed in a generic position w.r.t. an axial-symmetric mirror of unknown shape. The proposed method estimates the intrinsic parameters of the natural perspective camera, the 3D shape

Pose estimation from corresponding point data

by Robert M. Haralick, Fellow Ieee, Hyonam Joo, Chung-nan Lee, Xinhua Zhuang, Vinay G. Vaidya, Man, Bae Kim - IEEE Transactions on Systems, Man and Cybernetics , 1989
"... Abstracr--Solutions for four different pose estimation problems are presented. Closed form least-squares solutions are given to the over constrained ZD-ZD and 3-D-3-D pose estimation problems. A globally convergent iterative technique is given for the 2-D perspective projec-tion-3-D pose estimation ..."
Abstract - Cited by 199 (2 self) - Add to MetaCart
Abstracr--Solutions for four different pose estimation problems are presented. Closed form least-squares solutions are given to the over constrained ZD-ZD and 3-D-3-D pose estimation problems. A globally convergent iterative technique is given for the 2-D perspective projec-tion-3-D pose estimation
Results 1 - 10 of 1,244