Surround-screen projection-based virtual reality: the design and implementation of the CAVE
SIGGRAPH '93 Proceedings of the 20th annual conference on Computer graphics and interactive techniques
Three-dimensional computer vision: a geometric viewpoint
Three-dimensional computer vision: a geometric viewpoint
The ImmersaDesk and Infinity Wall projection-based virtual reality displays
ACM SIGGRAPH Computer Graphics
Emancipated pixels: real-world graphics in the luminous room
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
Multi-projector displays using camera-based registration
VIS '99 Proceedings of the conference on Visualization '99: celebrating ten years
Automatic alignment of high-resolution multi-projector display using an un-calibrated camera
Proceedings of the conference on Visualization '00
WireGL: a scalable graphics system for clusters
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Pre-emptive shadows: eliminating the blinding light from projectors
CHI '02 Extended Abstracts on Human Factors in Computing Systems
PixelFlex: a reconfigurable multi-projector display system
Proceedings of the conference on Visualization '01
Dynamic shadow removal from front projection displays
Proceedings of the conference on Visualization '01
Guest Editors' Introduction: Large-Format Displays
IEEE Computer Graphics and Applications
Tutorial: Introduction to Building Projection-based Tiled Display Systems
IEEE Computer Graphics and Applications
Projected Imagery in Your "Office of the Future"
IEEE Computer Graphics and Applications
The Metaverse: a networked collection of inexpensive, self-configuring, immersive environments
EGVE '03 Proceedings of the workshop on Virtual environments 2003
Color gamut matching for tiled display walls
EGVE '03 Proceedings of the workshop on Virtual environments 2003
iLamps: geometrically aware and self-configuring projectors
ACM SIGGRAPH 2003 Papers
Scalable self-calibrating display technology for seamless large-scale displays
Scalable self-calibrating display technology for seamless large-scale displays
Computer graphics optique optical superposition of projected computer graphics
EGVE'01 Proceedings of the 7th Eurographics conference on Virtual Environments & 5th Immersive Projection Technology
Multifocal Projection: A Multiprojector Technique for Increasing Focal Depth
IEEE Transactions on Visualization and Computer Graphics
Rapidly deployable multiprojector immersive displays
Presence: Teleoperators and Virtual Environments - Special issue: Immersive projection technology
GVU-PROCAMS: enabling novel projected interfaces
MULTIMEDIA '06 Proceedings of the 14th annual ACM international conference on Multimedia
Shadow Elimination and Blinding Light Suppression for Interactive Projected Displays
IEEE Transactions on Visualization and Computer Graphics
Calibrating multi-projector cylindrically curved displays for "wallpaper" projection
PROCAMS '08 Proceedings of the 5th ACM/IEEE International Workshop on Projector camera systems
The visual computing of projector-camera systems
ACM SIGGRAPH 2008 classes
Defocus Blur Correcting Projector-Camera System
ACIVS '08 Proceedings of the 10th International Conference on Advanced Concepts for Intelligent Vision Systems
Shadow removal in sole outdoor image
PCM'06 Proceedings of the 7th Pacific Rim conference on Advances in Multimedia Information Processing
Shadow removal in gradient domain
ICIAR'05 Proceedings of the Second international conference on Image Analysis and Recognition
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Abstract--Front-projection displays are a cost-effective and increasingly popular method for large format visualization and immersive rendering of virtual models. New approaches to projector tiling, automatic calibration, and color balancing have made multiprojector display systems feasible without undue infrastructure changes and maintenance. As a result, front-projection displays are being used to generate seamless, visually immersive worlds for virtual reality and visualization applications with reasonable cost and maintenance overhead. However, these systems suffer from a fundamental problem: Users and other objects in the environment can easily and inadvertently block projectors, creating shadows on the displayed image. Shadows occlude potentially important information and detract from the sense of presence an immersive display may have conveyed. We introduce a technique that detects and corrects shadows in a multiprojector display while it is in use. Cameras observe the display and compare observations with an expected image to detect shadowed regions. These regions are transformed to the appropriate projector frames, where corresponding pixel values are increased and/or attenuated. In display regions where more than one projector contributes to the image, shadow regions are eliminated.