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Effect Of Changing Patient Position From Supine To Prone On The Accuracy Of A Brown-Roberts-Wells Stereotactic Head Frame System

by Torsten Rohlfing, Calvin R. Maurer, Department Of Neurosurgery, Department Of Neurosurgery, David Dean Ph. D, Robert J. Maciunas, Wells Stereotactic, Head Frame System , 2003
"... on and one in the prone position. The prone images were registered to the respective supine images by use of an intensity-based registration algorithm, once using only the frame and once using only the head. The difference between the transformations produced by these two registrations describes ..."
Abstract - Cited by 3 (1 self) - Add to MetaCart
of the difference transformation for most patients. In general, the magnitude of the movement increased with brain volume, which is an index of head weight. CONCLUSION: To minimize frame-based registration error caused by a change in the mechanical load on the frame, stereotactic procedures should be performed

unknown title

by unknown authors
"... The effect of changing patient position from supine to prone on the accuracy of a Cosman-Roberts-Wells (CRW) stereotactic head frame system ..."
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The effect of changing patient position from supine to prone on the accuracy of a Cosman-Roberts-Wells (CRW) stereotactic head frame system

W4: Real-time surveillance of people and their activities

by Ismail Haritaoglu, David Harwood, Larry S. Davis - IEEE Transactions on Pattern Analysis and Machine Intelligence , 2000
"... w4 is a real time visual surveillance system for detecting and tracking multiple people and monitoring their activities in an outdoor environment. It operates on monocular gray-scale video imagery, or on video imagery from an infrared camera. W4 employs a combination of shape analysis and tracking t ..."
Abstract - Cited by 709 (9 self) - Add to MetaCart
w4 is a real time visual surveillance system for detecting and tracking multiple people and monitoring their activities in an outdoor environment. It operates on monocular gray-scale video imagery, or on video imagery from an infrared camera. W4 employs a combination of shape analysis and tracking

Visual Odometry

by David Nistér, Oleg Naroditsky, James Bergen - Proc. IEEE Conf. Computer Vision and Pattern Recognition (CVPR’04 , 2004
"... We present a system that estimates the motion of a stereo head or a single moving camera based on video input. The system operates in real-time with low delay and the motion estimates are used for navigational purposes. The front end of the system is a feature tracker. Point features are matched bet ..."
Abstract - Cited by 299 (5 self) - Add to MetaCart
We present a system that estimates the motion of a stereo head or a single moving camera based on video input. The system operates in real-time with low delay and the motion estimates are used for navigational purposes. The front end of the system is a feature tracker. Point features are matched

Color-Based Tracking of Heads and Other Mobile Objects at Video Frame Rates

by Paul Fieguth, Demetri Terzopoulos - in Proc. IEEE Conf. on Computer Vision and Pattern Recognition , 1997
"... We develop a simple and very fast method for object tracking based exclusively on color information in digitized video images. Running on a Silicon Graphics R4600 Indy system with an IndyCam, our algorithm is capable of simultaneously tracking objects at full frame size (640 \Theta 480 pixels) and v ..."
Abstract - Cited by 95 (0 self) - Add to MetaCart
We develop a simple and very fast method for object tracking based exclusively on color information in digitized video images. Running on a Silicon Graphics R4600 Indy system with an IndyCam, our algorithm is capable of simultaneously tracking objects at full frame size (640 \Theta 480 pixels

Tracking Loose-limbed People

by Leonid Sigal, Sidharth Bhatia, Stefan Roth, Michael J. Black, Michael Isard , 2004
"... We pose the problem of 3D human tracking as one of inference in a graphical model. Unlike traditional kinematic tree representations, our model of the body is a collection of loosely-connected limbs. Conditional probabilities relating the 3D pose of connected limbs are learned from motioncaptured tr ..."
Abstract - Cited by 191 (7 self) - Add to MetaCart
and aid recovery from transient tracking failures. We illustrate the method by automatically tracking a walking person in video imagery using four calibrated cameras. Our experimental apparatus includes a marker-based motion capture system aligned with the coordinate frame of the calibrated cameras

Reaching for objects in VR displays: Lag and frame rate

by Colin Ware, Ravin Balakrishnan - ACM Transactions on Computer-Human Interaction , 1994
"... This article reports the results from three experimental studies of reaching behavior in a head-coupled stereo display system with a hand-tracking subsystem for object selection. It is found that lag in the head-tracking system is relatively unimportant in predicting performance, whereas lag in the ..."
Abstract - Cited by 105 (4 self) - Add to MetaCart
This article reports the results from three experimental studies of reaching behavior in a head-coupled stereo display system with a hand-tracking subsystem for object selection. It is found that lag in the head-tracking system is relatively unimportant in predicting performance, whereas lag

A Corpus-based Conceptual Clustering Method for Verb Frames and Ontology Acquisition

by David Faure, Claire Nédellec - In LREC workshop on , 1998
"... We describe in this paper the ML system, ASIUM, which learns subcategorization frames of verbs and ontologies from syntactic parsing of technical texts in natural language. The restrictions of selection in the subcategorization frames are filled by the concepts of the ontology. Applications requiri ..."
Abstract - Cited by 108 (7 self) - Add to MetaCart
We describe in this paper the ML system, ASIUM, which learns subcategorization frames of verbs and ontologies from syntactic parsing of technical texts in natural language. The restrictions of selection in the subcategorization frames are filled by the concepts of the ontology. Applications

Visual odometry for ground vehicle applications

by David Nistér, Oleg Naroditsky, James Bergen - Journal of Field Robotics , 2006
"... We present a system that estimates the motion of a stereo head or a single moving camera based on video input. The system operates in real-time with low delay and the motion estimates are used for navigational purposes. The front end of the system is a feature tracker. Point features are matched bet ..."
Abstract - Cited by 155 (7 self) - Add to MetaCart
We present a system that estimates the motion of a stereo head or a single moving camera based on video input. The system operates in real-time with low delay and the motion estimates are used for navigational purposes. The front end of the system is a feature tracker. Point features are matched

Multi-Modal System for Locating Heads and Faces

by Hans Peter Graf, Eric Cosatto, Dave Gibbon, Michael Kocheisen, Eric Petajan - In Proc. 2nd Int. Conf. on Automatic Face and Gesture Recognition , 1996
"... We designed a modular system using a combination of shape analysis, color segmentation and motion information for locating reliably heads and faces of different sizes and orientations in complex images. The first of the system's three channels does a shape analysis on gray-level images to de ..."
Abstract - Cited by 65 (5 self) - Add to MetaCart
We designed a modular system using a combination of shape analysis, color segmentation and motion information for locating reliably heads and faces of different sizes and orientations in complex images. The first of the system's three channels does a shape analysis on gray-level images
Results 1 - 10 of 652