A flexible projector-camera system for multi-planar displays

Ashdown, Mark; Flagg, Matthew; Sukthankar, Rahul; Rehg, James M.

doi:10.1109/cvpr.2004.1315159

Cited by 47 publications

(37 citation statements)

References 14 publications

(21 reference statements)

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“…Since all prior methods can achieve geometric registration only with precise physical fiducials or complete 3D reconstruction, it is difficult to find a fair comparison to our method that does not use either of them. In the absence of fiducials, we compare our method with a naive homography-based registration [29], [16] and the registration with respect to a single viewpoint of the calibrating camera [9]. In addition to the obvious misregistrations, the shape of the display shows that wallpapering cannot be achieved on the curved surface without recovering the 3D geometry of the screen.…”

Section: Resultsmentioning

confidence: 99%

Autocalibrating Tiled Projectors on Piecewise Smooth Vertically Extruded Surfaces

Sajadi

Majumder

2011

IEEE Trans. Visual. Comput. Graphics

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Abstract-In this paper, we present a novel technique to calibrate multiple casually aligned projectors on fiducial-free piecewise smooth vertically extruded surfaces using a single camera. Such surfaces include cylindrical displays and CAVEs, common in immersive virtual reality systems. We impose two priors to the display surface. We assume the surface is a piecewise smooth vertically extruded surface for which the aspect ratio of the rectangle formed by the four corners of the surface is known and the boundary is visible and segmentable. Using these priors, we can estimate the display's 3D geometry and camera extrinsic parameters using a nonlinear optimization technique from a single image without any explicit display to camera correspondences. Using the estimated camera and display properties, the intrinsic and extrinsic parameters of each projector are recovered using a single projected pattern seen by the camera. This in turn is used to register the images on the display from any arbitrary viewpoint making it appropriate for virtual reality systems. The fast convergence and robustness of this method is achieved via a novel dimension reduction technique for camera parameter estimation and a novel deterministic technique for projector property estimation. This simplicity, efficiency, and robustness of our method enable several coveted features for nonplanar projection-based displays. First, it allows fast recalibration in the face of projector, display or camera movements and even change in display shape. Second, this opens up, for the first time, the possibility of allowing multiple projectors to overlap on the corners of the CAVE-a popular immersive VR display system. Finally, this opens up the possibility of easily deploying multiprojector displays on aesthetic novel shapes for edutainment and digital signage applications.

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Section: Resultsmentioning

confidence: 99%

Autocalibrating Tiled Projectors on Piecewise Smooth Vertically Extruded Surfaces

Sajadi

Majumder

2011

IEEE Trans. Visual. Comput. Graphics

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“…Since all prior methods can achieve geometric registration only with precise physical fiducials or complete 3D reconstruction, it is difficult to find a fair comparison to our method that does not use either of them. In the absence of fiducials, we compare our method with a naive homography-based registration [3,7] and the registration with respect to a single view-point of the calibrating camera [25]. In addition to the obvious misregistrations, the shape of the display shows that wall-papering cannot be achieved on the curved surface without recovering the 3D geometry of the screen.…”

Section: Resultsmentioning

confidence: 99%

Auto-calibration of cylindrical multi-projector systems

Sajadi

Majumder

2010

2010 IEEE Virtual Reality Conference (VR)

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In this paper we present a novel technique to calibrate multiple casually aligned projectors on a fiducial-free cylindrical curved surface using a single camera. We impose two priors to the cylindrical display: (a) cylinder is a vertically extruded surface; and (b) the aspect ratio of the rectangle formed by the four corners of the screen is known. Using these priors, we can estimate the display's 3D surface geometry and camera extrinsic parameters using a single image without any explicit display to camera correspondences. Using the estimated camera and display properties, we design a novel deterministic algorithm to recover the intrinsic and extrinsic parameters of each projector using a single projected pattern seen by the camera which is then used to register the images on the display from any arbitrary viewpoint making it appropriate for virtual reality systems. Finally, our method can be extended easily to handle sharp corners -making it suitable for the common CAVE like VR setup. To the best of our knowledge, this is the first method that can achieve accurate geometric auto-calibration of multiple projectors on a cylindrical display without performing an extensive stereo reconstruction.

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“…The implementation of most SAR systems involves multiple automatically-calibrated cameras and projectors [14]. The projectors may also be used to generate patterns of structured light to reconstruct the geometry of a multi-planar display [15], [16]. Different mechanisms for interacting with these projected user interfaces have been proposed, prototyped, and evaluated for effectiveness.…”

Section: Virtual Environmentsmentioning

confidence: 99%

A Spatially Augmented Reality Sketching Interface for Architectural Daylighting Design

Sheng

Yapo

Young

et al. 2011

IEEE Trans. Visual. Comput. Graphics

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Abstract-We present an application of interactive global illumination and spatially augmented reality to architectural daylight modeling that allows designers to explore alternative designs and new technologies for improving the sustainability of their buildings. Images of a model in the real world, captured by a camera above the scene, are processed to construct a virtual 3D model. To achieve interactive rendering rates, we use a hybrid rendering technique, leveraging radiosity to simulate the inter-reflectance between diffuse patches and shadow volumes to generate per-pixel direct illumination. The rendered images are then projected on the real model by four calibrated projectors to help users study the daylighting illumination. The virtual heliodon is a physical design environment in which multiple designers, a designer and a client, or a teacher and students can gather to experience animated visualizations of the natural illumination within a proposed design by controlling the time of day, season, and climate. Furthermore, participants may interactively redesign the geometry and materials of the space by manipulating physical design elements and see the updated lighting simulation.

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A flexible projector-camera system for multi-planar displays

Cited by 47 publications

References 14 publications

Autocalibrating Tiled Projectors on Piecewise Smooth Vertically Extruded Surfaces

Autocalibrating Tiled Projectors on Piecewise Smooth Vertically Extruded Surfaces

Auto-calibration of cylindrical multi-projector systems

A Spatially Augmented Reality Sketching Interface for Architectural Daylighting Design

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