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Camera-based detection and removal of shadows from interactive multiprojector displays.
IEEE Trans Vis Comput Graph. 2004 May-Jun; 10(3):290-301.IT

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.

Authors+Show Affiliations

Department of Computer Science, University of Kentucky, Lexington, KY 40506, USa. jaynes@uky.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

18579960

Citation

Jaynes, Christopher, et al. "Camera-based Detection and Removal of Shadows From Interactive Multiprojector Displays." IEEE Transactions On Visualization and Computer Graphics, vol. 10, no. 3, 2004, pp. 290-301.
Jaynes C, Webb S, Steele RM. Camera-based detection and removal of shadows from interactive multiprojector displays. IEEE Trans Vis Comput Graph. 2004;10(3):290-301.
Jaynes, C., Webb, S., & Steele, R. M. (2004). Camera-based detection and removal of shadows from interactive multiprojector displays. IEEE Transactions On Visualization and Computer Graphics, 10(3), 290-301. https://doi.org/10.1109/TVCG.2004.1272728
Jaynes C, Webb S, Steele RM. Camera-based Detection and Removal of Shadows From Interactive Multiprojector Displays. IEEE Trans Vis Comput Graph. 2004 May-Jun;10(3):290-301. PubMed PMID: 18579960.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Camera-based detection and removal of shadows from interactive multiprojector displays. AU - Jaynes,Christopher, AU - Webb,Stephen, AU - Steele,R Matt, PY - 2008/6/27/pubmed PY - 2008/8/1/medline PY - 2008/6/27/entrez SP - 290 EP - 301 JF - IEEE transactions on visualization and computer graphics JO - IEEE Trans Vis Comput Graph VL - 10 IS - 3 N2 - 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. SN - 1077-2626 UR - https://www.unboundmedicine.com/medline/citation/18579960/Camera_based_detection_and_removal_of_shadows_from_interactive_multiprojector_displays_ L2 - https://doi.ieeecomputersociety.org/10.1109/TVCG.2004.1272728 DB - PRIME DP - Unbound Medicine ER -