Dr. Gregory F. Welch – Publications

@incollection{Raskar1999a,

title = {Mutli-Projector Displays Using Camera-Based Registration},

author = {Ramesh Raskar and Michael Brown and Ruigang Yang and Wei-Chao Chen and Greg Welch and Herman Towles and Brent Seales and Henry Fuchs },

url = {https://sreal.ucf.edu/wp-content/uploads/2017/02/Raskar1999a.pdf},

year  = {1999},

date = {1999-01-01},

booktitle = {Proceedings of the Conference on Visualization 99: Celebrating Ten Years},

pages = {161-168},

address = {San Francisco, CA, USA (October 24 - 29)},

series = {IEEE Visualization},

abstract = {Conventional projector-based display systems are typically designed around precise and regular configurations of projectors and display surfaces. While this results in rendering simplicity and speed,it also means painstaking construction and ongoing maintenance. In previously published work, we introduced a vision of projector-based displays constructed from a collection of casually-arranged projectors and display surfaces.parIn this paper,we present flexible yet practical methods for realizing this vision, enabling low-cost mega-pixel display systems with large physical dimensions, higher resolution, or both. The techniques afford new opportunities to build personal 3D visualization systems in offices, conference rooms, theaters, or even your living room. As a demonstration of the simplicity and effectiveness of the methods that we continue to perfect, we show in the included video that a 10-year old child can construct and calibrate a two-camera, two-projector, head-tracked display system, all in about 15 minutes.},

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}

@incollection{Raskar1999b,

title = {Table-Top Spatially-Augmented Reality: Bringing Physical Models to Life with Projected Imagery},

author = {Ramesh Raskar and Greg Welch and Wei-Chao Chen},

url = {https://sreal.ucf.edu/wp-content/uploads/2017/02/Raskar1999b.pdf},

year  = {1999},

date = {1999-01-01},

booktitle = {Second International Workshop on Augmented Reality (IWAR'99)},

pages = {64-71},

address = {San Francisco, CA, USA},

keywords = {},

pubstate = {published},

tppubtype = {incollection}

}

@incollection{Raskar1998a,

title = {The Office of the Future: A Unified Approach to Image-Based Modeling and Spatially Immersive Displays},

author = {Ramesh Raskar and Gregory Welch and Matthew Cutts and Adam Lake and Lev Stesin and Henry Fuchs},

editor = {Michael F. Cohen},

url = {https://sreal.ucf.edu/wp-content/uploads/2017/02/Raskar1998a.pdf},

doi = {10.1145/280814.280861},

year  = {1998},

date = {1998-01-01},

booktitle = {Computer Graphics},

pages = {179-188},

publisher = {ACM Press, Addison-Wesley},

address = {Orlando, FL, USA (July 19 - 24)},

edition = {SIGGRAPH Conference Proceedings},

series = {Annual Conference on Computer Graphics & Interactive Techniques},

abstract = {We introduce ideas, proposed technologies, and initial results for an office of the future that is based on a unified application of computer vision and computer graphics in a system that combines and builds upon the notions of the CAVE, tiled display systems, and image-based modeling. The basic idea is to use real-time computer vision techniques to dynamically extract per-pixel depth and reflectance information for the visible surfaces in the office including walls, furniture, objects, and people, and then to either project images on the surfaces, render images of the surfaces, or interpret changes in the surfaces. In the first case, one could designate every-day (potentially irregular) real surfaces in the office to be used as spatially immersive display surfaces, and then project high-resolution graphics and text onto those surfaces. In the second case, one could transmit the dynamic image-based models over a network for display at a remote site. Finally, one could interpret dynamic changes in the surfaces for the purposes of tracking, interaction, or augmented reality applications.parTo accomplish the simultaneous capture and display we envision an office of the future where the ceiling lights are replaced by computer controlled cameras and smart projectors that are used to capture dynamic image-based models with imperceptible structured light techniques, and to display high-resolution images on designated display surfaces. By doing both simultaneously on the designated display surfaces, one can dynamically adjust or autocalibrate for geometric, intensity, and resolution variations resulting from irregular or changing display surfaces, or overlapped projector images.parOur current approach to dynamic image-based modeling is to use an optimized structured light scheme that can capture per-pixel depth and reflectance at interactive rates. Our system implementation is not yet imperceptible, but we can demonstrate the approach in the laboratory. Our approach to rendering on the designated (potentially irregular) display surfaces is to employ a two-pass projective texture scheme to generate images that when projected onto the surfaces appear correct to a moving head-tracked observer. We present here an initial implementation of the overall vision, in an office-like setting, and preliminary demonstrations of our dynamic modeling and display techniques.},

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@incollection{Raskar1998c,

title = {Efficient Image Generation for Multiprojector and Multisurface Displays},

author = {Ramesh Raskar and Matthew Cutts and Greg Welch and Wolfgang Stüerzlinger},

editor = {George Drettakis and Nelson Max},

url = {https://sreal.ucf.edu/wp-content/uploads/2017/02/Raskar1998c.pdf},

year  = {1998},

date = {1998-01-01},

booktitle = {Proceedings of the Eurographics Workshop in Vienna, Austria},

pages = {139-144},

publisher = {Springer Verlag},

address = {Vienna, Austria (June 29 - July 1)},

edition = {Rendering Techniques 98},

note = {ISBN 3-211-83213-0},

keywords = {},

pubstate = {published},

tppubtype = {incollection}

}

@incollection{Raskar1998d,

title = {Spatially Augmented Reality},

author = {Ramesh Raskar and Greg Welch and Henry Fuchs},

editor = {Reinhold Behringer and Gudrun Klinker and David Mizell},

url = {https://sreal.ucf.edu/wp-content/uploads/2017/02/Raskar1998d-IWAR_SAR.pdf},

year  = {1998},

date = {1998-01-01},

booktitle = {Augmented Reality; Placing Artificial Objects in Real ScenesProceedings of the First IEEE Workshop on Augmented Reality (IWAR'98). Long lasting Impact Paper Award},

pages = {63-72},

publisher = {A.K. Peters Ltd.},

address = {San Francisco, CA, USA (November 1, 1998)},

note = {ISBN 1-56881-098-9},

keywords = {},

pubstate = {published},

tppubtype = {incollection}

}

@incollection{Welch1997,

title = {SCAAT: Incremental Tracking with Incomplete Information},

author = {Greg Welch and Gary Bishop},

editor = {Turner Whitted},

url = {https://sreal.ucf.edu/wp-content/uploads/2017/02/Welch1997.pdf},

year  = {1997},

date = {1997-01-01},

booktitle = {Computer Graphics},

pages = {333--344},

publisher = {ACM Press, Addison-Wesley},

address = {Los Angeles, CA, USA (August 3--8)},

edition = {SIGGRAPH 97 Conference Proceedings},

series = {Annual Conference on Computer Graphics & Interactive Techniques},

abstract = {We present a promising new mathematical method for tracking a user's pose (position and orientation) for interactive computer graphics. The method, which is applicable to a wide variety of both commercial and experimental systems, improves accuracy by properly assimilating sequential observations, filtering sensor measurements, and by concurrently autocalibrating source and sensor devices. It facilitates user motion prediction, multisensor data fusion, and higher report rates with lower latency than previous methods.parTracking systems determine the user's pose by measuring signals from low-level hardware sensors. For reasons of physics and economics, most systems make multiple sequentialnewlinemeasurements which are then combined to produce a single tracker report. For example, commercial magnetic trackers using the SPASYN (Space Synchro) system sequentially measure three magnetic vectors and then combine them mathematically to produce a report of the sensor pose.parOur new approach produces tracker reports as each new low-level sensor measurement is made rather than waiting to form a complete collection of observations. Because single observationsnewlineunder-constrain the mathematical solution, we refer to our approach as single-constraint-at-a-time or SCAAT tracking. The key is that the single observations provide some information about the user's state, and thus can be used to incrementally improve anewlineprevious estimate. We recursively apply this principle, incorporating new sensor data as soon as it is measured. With this approach we are able to generate estimates more frequently, withnewlineless latency, and with improved accuracy. We present results from both an actual implementation, and from extensive simulations.},

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