Search For:

Displaying 1-34 out of 34 total
High-quality scanning using time-of-flight depth superresolution
Found in: Computer Vision and Pattern Recognition Workshop
By Sebastian Schuon, Christian Theobalt, James Davis, Sebastian Thrun
Issue Date:June 2008
pp. 1-7
Time-of-flight (TOF) cameras robustly provide depth data of real world scenes at video frame rates. Unfortunately, currently available camera models provide rather low X-Y resolution. Also, their depth measurements are starkly influenced by random and syst...
 
Real-time foreground segmentation via range and color imaging
Found in: Computer Vision and Pattern Recognition Workshop
By Ryan Crabb, Colin Tracey, Akshaya Puranik, James Davis
Issue Date:June 2008
pp. 1-5
This paper describes a real-time method for foreground/background segmentation of a color video sequence based primarily on range data of a time-of-flight sensor. This method uses depth information of a TOF-sensor paired with a high resolution color video ...
 
Fusion of time-of-flight depth and stereo for high accuracy depth maps
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Jiejie Zhu, Liang Wang, Ruigang Yang, James Davis
Issue Date:June 2008
pp. 1-8
Time-of-flight range sensors have error characteristics which are complementary to passive stereo. They provide real time depth estimates in conditions where passive stereo does not work well, such as on white walls. In contrast, these sensors are noisy an...
 
Automatic Natural Video Matting with Depth
Found in: Computer Graphics and Applications, Pacific Conference on
By Oliver Wang, Jonathan Finger, Qingxiong Yang, James Davis, Ruigang Yang
Issue Date:November 2007
pp. 469-472
Video matting is the process of taking a sequence of frames, isolating the foreground, and replacing the background in each frame. We look at existing single-frame matting techniques and present a method that improves upon them by adding depth information ...
 
Using Comprehensive Analysis for Performance Debugging in Distributed Storage Systems
Found in: Mass Storage Systems and Technologies, IEEE / NASA Goddard Conference on
By Andrew W. Leung, Eric Lalonde, Jacob Telleen, James Davis, Carlos Maltzahn
Issue Date:September 2007
pp. 281-286
Achieving performance, reliability, and scalability presents a unique set of challenges for large distributed storage. To identify problem areas, there must be a way for developers to have a comprehensive view of the entire storage system. That is, users m...
 
Viewpoint-Coded Structured Light
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Mark Young, Erik Beeson, James Davis, Szymon Rusinkiewicz, Ravi Ramamoorthi
Issue Date:June 2007
pp. 1-8
We introduce a theoretical framework and practical algorithms for replacing time-coded structured light patterns with viewpoint codes, in the form of additional camera locations. Current structured light methods typically use log(N) light patterns, encoded...
 
Spatial-Depth Super Resolution for Range Images
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Qingxiong Yang, Ruigang Yang, James Davis, David Nister
Issue Date:June 2007
pp. 1-8
We present a new post-processing step to enhance the resolution of range images. Using one or two registered and potentially high-resolution color images as reference, we iteratively refine the input low-resolution range image, in terms of both its spatial...
 
Improved Sub-pixel Stereo Correspondences through Symmetric Refinement
Found in: Computer Vision, IEEE International Conference on
By Diego Nehab, Szymon Rusinkiewicz, James Davis
Issue Date:October 2005
pp. 557-563
Most dense stereo correspondence algorithms start by establishing discrete pixel matches and later refine these matches to sub-pixel precision. Traditional sub-pixel refinement methods attempt to determine the precise location of points, in the secondary i...
 
Spacetime Stereo: A Unifying Framework for Depth from Triangulation
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By James Davis, Diego Nehab, Ravi Ramamoorthi, Szymon Rusinkiewicz
Issue Date:February 2005
pp. 296-302
Depth from triangulation has traditionally been investigated in a number of independent threads of research, with methods such as stereo, laser scanning, and coded structured light considered separately. In this paper, we propose a common framework called ...
 
Computing Depth under Ambient Illumination Using Multi-Shuttered Light
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Hector Gonzalez-Banos, James Davis
Issue Date:July 2004
pp. 234-241
Range imaging has become a critical component of many computer vision applications. The quality of the depth data is of critical importance, but so is the need for speed. Shuttered light-pulse (SLP) imaging uses active illumination hardware to provide high...
 
IEEE Workshop on Real-Time 3D Sensors and Their Use
Found in: Computer Vision and Pattern Recognition Workshop
By Salih Burak Gokturk, Carlo Tomasi, Abbas Rafii, James Davis
Issue Date:July 2004
pp. 27
The past few years have seen improvements in the frame rate, accuracy, cost, and size of 3D sensors, including systems based on stereo vision, time-of-flight, structured light, and depth-from-X methods. These exciting developments have sparked increasing i...
   
Calibrating pan-tilt cameras in wide-area surveillance networks
Found in: Computer Vision, IEEE International Conference on
By James Davis, Xing Chen
Issue Date:October 2003
pp. 144
Pan-tilt cameras are often used as components of wide-area surveillance systems. It is necessary to calibrate these cameras in relation to one another in order to obtain a consistent representation of the entire space. Existing methods for calibrating pan-...
 
Spacetime Stereo: A Unifying Framework for Depth from Triangulation
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By James Davis, Ravi Ramamoorthi, Szymon Rusinkiewicz
Issue Date:June 2003
pp. 359
Depth from triangulation has traditionally been treated in a number of separate threads in the computer vision literature, with methods like stereo, laser scanning, and coded structured light considered separately. In this paper, we propose a common framew...
 
Filling Holes in Complex Surfaces using Volumetric Diffusion
Found in: 3D Data Processing Visualization and Transmission, International Symposium on
By James Davis, Stephen R. Marschner, Matt Garr, Marc Levoy
Issue Date:June 2002
pp. 428
We address the problem of building watertight 3D models from surfaces that contain holes -for example, sets of range scans that observe most but not all of a surface. We specifically address situations in which the holes are too geometrically and topologic...
 
Wearable Computers as Packet Transport Mechanisms in Highly-Partitioned Ad-Hoc Networks
Found in: Wearable Computers, IEEE International Symposium
By James A. Davis, Andrew H. Fagg, Brian N. Levine
Issue Date:October 2001
pp. 141
The decreasing size and cost of wearable computers and mobile sensors is presenting new challenges and opportunities for deploying networks. Existing network routing protocols provide reliable communication between nodes and allow for mobility and even ad-...
 
A Graduate-Level Course on CBS Design Tool Development
Found in: Engineering of Computer-Based Systems, IEEE International Conference on the
By Greg Nordstrom, James Davis, Mark Briski
Issue Date:April 2001
pp. 0269
Abstract: A graduate-level course addressing the design and development of modeling tools for computer-based systems (CBS) is described. A Model Integrated Computing (MIC) approach to the design of CBS is taught wherein domain applications are automaticall...
 
Motion Segmentation and Pose Recognition with Motion History Gradients
Found in: Applications of Computer Vision, IEEE Workshop on
By Gary R. Bradski, James Davis
Issue Date:December 2000
pp. 238
This paper uses a simple method for representing motion in successively layered silhouettes that directly encode system time termed the timed Motion History Image (tMHI). This representation can be used to both (a) determine the current pose of the object ...
 
Categorical Representation and Recognition of Oscillatory Motion Patterns
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By James Davis, Whitman Richards, Aaron Bobick
Issue Date:June 2000
pp. 1628
Many communicative behaviors in the animal kingdom consist of performing and recognizing specialized patterns of oscillatory motion. Here we present an approach to the representation and recognition of these oscillatory motions based on the categorical org...
 
Wide Area Camera Calibration Using Virtual Calibration Objects
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Xing Chen, James Davis, Philipp Slusallek
Issue Date:June 2000
pp. 2520
This paper introduces a method to calibrate a wide area system of unsynchronized cameras with respect to a single global coordinate system. The method is simple and does not require the physical construction of a large calibration object. The user need onl...
 
Situation Assessment and Decision Making Integrated into the Process Centered Environment
Found in: Engineering of Computer-Based Systems, IEEE International Conference on the
By Stephanie White, Susan Dorchak, John Keane, William Pallack, Jerry Owens, Jerzy Rozenblit, James Davis, Janos Sztipanovits
Issue Date:March 1999
pp. 129
Researchers have defined a number of process modeling methods and have developed in-roads to process-centered environments that support process modeling and project control. However, there is little research that incorporates variability of the human condi...
 
Multi-Domain Surety Modeling and Analysis for High Assurance Systems
Found in: Engineering of Computer-Based Systems, IEEE International Conference on the
By James Davis, Jason Scott, Janos Sztipanovits, Marcus Martinez
Issue Date:March 1999
pp. 254
Engineering systems are becoming increasingly complex as state of the art technologies are incorporated into designs. Surety modeling and analysis is an emerging science that permits an engineer to qualitatively and quantitatively predict and assess the co...
 
Personal Photograph Enhancement Using Internet Photo Collections
Found in: IEEE Transactions on Visualization and Computer Graphics
By Chenxi Zhang, Jizhou Gao,Oliver Wang,Pierre Georgel, Ruigang Yang,James Davis,Jan-Michael Frahm,Marc Pollefeys
Issue Date:February 2014
pp. 262-275
Given the growth of Internet photo collections, we now have a visual index of all major cities and tourist sites in the world. However, it is still a difficult task to capture that perfect shot with your own camera when visiting these places, especially wh...
 
Facial type, expression, and viseme generation
Found in: ACM SIGGRAPH 2007 posters on XX (SIGGRAPH '07)
By James Davis, James Skorupski, Jerry Yee, Josh McCoy
Issue Date:August 2007
pp. 34-es
The process of generating facial models and various poses of these models is a necessary part of most present-day movies, and usually required for any interactive game which features humans as a primary character. The generation of this face data can be ap...
     
Integrated Analysis Environment for High Impact Systems
Found in: Engineering of Computer-Based Systems, IEEE International Conference on the
By James Davis, Jason Scott, Janos Sztipanovits, Gabor Karsai, Marcus Martinez
Issue Date:April 1998
pp. 0218
Modeling and analysis of high consequence, high assurance systems requires special modeling considerations. System safety and reliability information must be captured in the models. Previously, high consequence systems were modeled using separate, disjoint...
   
Practical 3D+2D displays
Found in: ACM SIGGRAPH 2013 Posters (SIGGRAPH '13)
By James Davis, Jing Liu
Issue Date:July 2013
pp. 1-1
High-end televisions, monitors and gaming laptop screens are shifting from 2D to 3D. Most commercially available 3D displays show stereoscopic images to viewers wearing special glasses, while showing incomprehensible ghosted images to viewers without glass...
     
3D+2DTV: 3D displays with no ghosting for viewers without glasses
Found in: ACM Transactions on Graphics (TOG)
By James Davis, Jing Liu, Prabath Gunawardane, Rajan Vaish, Steven Scher
Issue Date:June 2013
pp. 1-10
3D displays are increasingly popular in consumer and commercial applications. Many such displays show 3D images to viewers wearing special glasses, while showing an incomprehensible double image to viewers without glasses. We demonstrate a simple method th...
     
Wally: crowd powered image matching on tablets
Found in: Proceedings of the First International Workshop on Crowdsourcing and Data Mining (CrowdKDD '12)
By Deepak Pai, James Davis
Issue Date:August 2012
pp. 10-14
In this paper we propose a crowd sourced approach for solving large scale object retrieval. We have built a tablet application which displays a query image and a database image. The crowd provides their input to indicate, if there is a match between the qu...
     
Printing reflectance functions
Found in: ACM Transactions on Graphics (TOG)
By Adam Crume, Douglas Dunn, James Davis, Ramin Samadani, Steven Scher, Tom Malzbender
Issue Date:May 2012
pp. 1-11
The reflectance function of a scene point captures the appearance of that point as a function of lighting direction. We present an approach to printing the reflectance functions of an object or scene so that its appearance is modified correctly as a functi...
     
Measuring water collection times in Kenyan informal settlements
Found in: Proceedings of the Fifth International Conference on Information and Communication Technologies and Development (ICTD '12)
By Ben Crow, James Davis, Julio Miles
Issue Date:March 2012
pp. 114-121
This paper uses GPS loggers and interviews to measure the time taken to collect water in two Kenyan informal settlements. The time devoted to water collection is widely believed to prevent women and girls, who do most of this work, from undertaking more cr...
     
Best document selection based on approximate utility optimization
Found in: Proceedings of the 34th international ACM SIGIR conference on Research and development in Information (SIGIR '11)
By Hungyu Henry Lin, James Davis, Yi Zhang
Issue Date:July 2011
pp. 1215-1216
This poster describes an alternative approach to handling the best document selection problem. Best document selection is a common problem with many real world applications, but is not a well studied problem by itself; a simple solution would be to treat i...
     
Alice and robotics in introductory CS courses
Found in: The Fifth Richard Tapia Celebration of Diversity in Computing Conference: Intellect, Initiatives, Insight, and Innovations (TAPIA '09)
By Briana Lowe Wellman, James Davis, Monica Anderson
Issue Date:April 2009
pp. 1-29
Statistics for underrepresented minority groups and women continue to show low numbers in enrollment and rates of retention in academic computer science programs. A new approach to increase student interest in computer science in a first year program is in...
     
Keyframe animation using an artist's doll
Found in: ACM SIGGRAPH 2007 posters on XX (SIGGRAPH '07)
By Eddy Chandra, James Davis, Prabath Gunawardane, Tien-Chieng Jack Feng
Issue Date:August 2007
pp. 93-es
Keyframe animation of an articulated human figure is a difficult task due to the large number of degrees of freedom inherent in the model's 3D joints, the complex range of motion and the vast amount of possible interpolations between keyframes. Existing so...
     
Modeling methodology for integrated simulation of embedded systems
Found in: ACM Transactions on Modeling and Computer Simulation (TOMACS)
By Aditya Agrawal, Akos Ledeczi, James Davis, Sandeep Neema
Issue Date:January 2003
pp. 82-103
Developing a single embedded application involves a multitude of different development tools including several different simulators. Most tools use different abstractions, have their own formalisms to represent the system under development, utilize differe...
     
Copy detection mechanisms for digital documents
Found in: Proceedings of the 1995 ACM SIGMOD international conference on Management of data (SIGMOD '95)
By Hector Garcia-Molina, James Davis, Sergey Brin
Issue Date:May 1995
pp. 219-230
In a digital library system, documents are available in digital form and therefore are more easily copied and their copyrights are more easily violated. This is a very serious problem, as it discourages owners of valuable information from sharing it with a...
     
 1