Practical Methods for Geometric and Photometric Correction of Tiled Projector

Harville, M.; Culbertson, Bruce; Sobel, Irwin; Gelb, Dan; Fitzhugh, Andrew; Tanguay, Donald

doi:10.1109/cvprw.2006.161

Cited by 50 publications

(68 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Unlike any existing method that use a single camera to register multiple projectors on a non-planar display [25,11,22], we can reconstruct the shape of the 3D display. This enables us to parametrize the display directly in a 3D coordinate system, rather than in the camera image space, to achieve a view-independent geometric registration.…”

Section: Main Contributionsmentioning

confidence: 99%

“…Though there is a large body of literature that addresses such a reconstruction and registration [19,8,9,12,27,13,11,22], these are complex procedures requiring camera calibration and multiple physical fiducials on the display surface. Hence, many methods try to avoid the complexity of using multiple cameras when using non-planar screens.…”

Section: Introductionmentioning

confidence: 99%

“…So, this registration is particularly unsuitable for VR applications where the user moves around deviating considerably from the position of the calibrating camera. [11,22] try to avoid the view-dependency for cylindrical surfaces by relating the camera coordinates to the physical coordinates of the display by pasting special fiducials on the two rims of the display surface. Though this 'wall-papers' the imagery on the display, lack of a 3D display reconstruction does not allow registration from arbitrary viewpoints.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Auto-calibration of cylindrical multi-projector systems

Sajadi

Majumder

2010

2010 IEEE Virtual Reality Conference (VR)

View full text Add to dashboard Cite

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.

show abstract

Section: Main Contributionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Auto-calibration of cylindrical multi-projector systems

Sajadi

Majumder

2010

2010 IEEE Virtual Reality Conference (VR)

View full text Add to dashboard Cite

show abstract

“…These masks are generated according to the data obtained in the geometric correction process of the projectors. The same correction function ) ( i p G  is used as presented in [12] and is expressed as follows:…”

Section: A Correcting the Overlapping Zones For Bright Scenesmentioning

confidence: 99%

Tiled Projector Displays Correction for Dark Scenes in Railway Simulators

Zoido

Maroto

Romero

et al. 2011

2011 UKSim 5th European Symposium on Computer Modeling and Simulation

View full text Add to dashboard Cite

Abstract-Tiled projector displays are a common choice for training simulators, where a high resolution output image is required. They are cheap for the resolution that they can reach and can be configured in many different ways. Nevertheless, such kinds of displays require geometric and color correction so that the composite image looks seamless. Display correction is an even bigger challenge when the projected images include dark scenes combined with brighter scenes. This is usually a problem for railway simulators when the train is positioned inside a tunnel and the black offset effect becomes noticeable. In this paper, a method for fast photometric and geometric correction of tiled display systems where dark and bright scenes are combined is presented. The image correction is carried out in two steps. First, geometric alignment and overlapping areas attenuation for brighter scenes is applied. Second, in the event of being inside a tunnel, the brightness of the scene is increased in certain areas using light sources in order to create the impression of darkness but minimizing the effect of the black offset.

show abstract

“…Structured light patterns are used to compute the relative geometries between camera and projector, and thus no explicit calibration is used. In Harville et al [21], a method is proposed to project imagery without distortion onto a developable surface-e.g., flat walls, piecewise-planar shapes, cylindrical and conical sections-in such a way that the images to be displayed appear like a wallpaper on the display surface. Camera-projector correspondences are obtained by using a structured light approach that is based on projecting a sequence of bar images (8 to 12 images) of increasingly fine spatial frequency to temporally encode the projector coordinates corresponding to various camera pixels.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens

et al. 2017

View full text Add to dashboard Cite

Abstract:The geometric calibration of projectors is a demanding task, particularly for the industry of virtual reality simulators. Different methods have been developed during the last decades to retrieve the intrinsic and extrinsic parameters of projectors, most of them being based on planar homographies and some requiring an extended calibration process. The aim of our research work is to design a fast and user-friendly method to provide multi-projector calibration on analytically defined screens, where a sample is shown for a virtual reality Formula 1 simulator that has a cylindrical screen. The proposed method results from the combination of surveying, photogrammetry and image processing approaches, and has been designed by considering the spatial restrictions of virtual reality simulators. The method has been validated from a mathematical point of view, and the complete system-which is currently installed in a shopping mall in Spain-has been tested by different users.

show abstract

Practical Methods for Geometric and Photometric Correction of Tiled Projector

Cited by 50 publications

References 4 publications

Auto-calibration of cylindrical multi-projector systems

Auto-calibration of cylindrical multi-projector systems

Tiled Projector Displays Correction for Dark Scenes in Railway Simulators

A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens

Contact Info

Product

Resources

About