Overview
The StubeRenA Website.

Calibration and Setup
We designed a software package to calibrate different setups.

A Seamless Tiled Displays
High-detailed scenery can be shown using seamless tiled displays .

Images
Images of a 2x2 projector setup.

StubeRena -
Calibration and Setup

We implemented a calibration software that handles any number of displays. This allows us to set up different types of displays.

Calibration

Our calibration software calibrates any number of displays. It computes the orientation of each display within the tiled display to find the geometrical relation of all displays using the techniques describeb by Raskar and his colleagues [1999,2000,2002]. We use an off-the-shelf camera to detect feature points of a calibration pattern shown by each display. With the detected feature points we can compute a homography (a collineation) between camera-display and display-display space to map the pixels of different displays.

With the "display to display"-homographies we can compute the blending masks needed to blend pixels in overlapping regions and undistort the oblique projection.

With this approach it is possible to achieved subpixel accuracy even in regions where multiple projectors overlap. The next images shows a 2x2 projector setup. The top left projector is brigther to highlight the overlapping regions.

Setup

We can set up a seamless tiled display using projectors as shown below (I), a monitor display wall (IIa), or a mixture of a tiled display and a monitor display wall. For each display a short description file characterizes the type and the resolution of the display. If a seamless tiled display is built even a passive stereo set up is possible.

By design any setup is possible and the user can choose between a mono and a stereo display. This allows a wide range of different setups. The calibration software is capable to produce the needed setup files for the Studierstube system to drive the tiled display. So the user is free from starting up the Studierstube framework on each station within the render cluster.

RASKAR, R. 1999. Oblique Projector Rendering on Planar Surfaces for a Tracked User, SIGGRAPH 1999 (1999), Sketch.
RASKAR, R. 2000. Immersive Planar Display using Roughly Aligned Projectors, In IEEE Virtual Reality (March 2000).
RASKAR, R. et al. 2002 A Low-Cost Projector Mosaic with Fast Registration, In Proceedings of Fifth Asian Conference on Computer Vision (January 2002).

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Interactive Media Systems Group
Institute for Software Technology and Interactive Systems
Vienna University of Technology

Favoritenstrasse 9-11/188/2
A-1040 Vienna, Austria

http://www.ims.tuwien.ac.at/