Projection systems have become the ubiquitous infrastructure for presentation technology. However, unless the projector is precisely aligned to the presentation screen, the resulting image suffers from perspective (keystone) distortions requiring manual optical or digital correction. This tedious process must be repeated whenever the projector or screen is moved and is increasingly relevant giv...

Projection systems have become the ubiquitious infrastructure for presentation technology. How-ever, unless the projector is precisely aligned to the presentation screen, the resulting image suffersfrom perspective (keystone) distortions requiring manual optical or digital correction. This tediousprocess must be repeated whenever the projector or screen is moved and is increasingly ...

The interaction vertex for a fermionic first order system of weights (1, 0) such as the twisted bc system, the fermionic part of N=2 string field theory and the auxiliary ηξ system of N=1 strings is formulated in the Moyal basis. In this basis, the Neumann matrices are diagonal; as usual, the eigenvectors are labeled by κ ∈ R. Oscillators constructed from these eigenvectors make up two Clifford...

Alain Pagani Didier Stricker Abstract — A major issue when setting up multi-projector tiled displays is the spatial non-uniformity of the color throughout the display’s area. Indeed, the chromatic properties do not only vary between two different projectors, but also between different spatial locations inside the displaying area of one single projector. A new method for calibrating the colors o...

A typical video projector has three fixed primaries, typically red, green and blue, and operates by showing a sub-frame consisting of a single color primary at a time. In order to improve the color gamut the projector can cover, one could add more color primaries (e.g. yellow, magenta), however, this would require the projector to be able to operate at higher speeds to show more primaries. Here...

-Recently, portable LCD projectors have become increasingly popular for various usages. However a careful aligning to the projection surface or a flat screen are necessary for getting a good projection effect. If a projector can display an undistorted image on an unknown geometry surface, more and more applications can be expected. In this paper, we present a new new approach allowing a project...

The image generated by an off-center projector appears distorted (Figure 1, left). Using an uncalibrated camera pointed at the presentation screen, our system automatically recovers the projector-to-screen homography and pre-warps the computer output to produce a keystone-corrected image (Figure 1, right). This allows the presenter to place the microportable projector anywhere in the room witho...

Projector phones are starting to be marketed for business presentations and media viewing, and we have begun to document how people use them "in the wild." We have observed that, in addition to the expected uses, projector phones afford novel interaction modalities. A key observation is that users can readily exploit projector phones' new facilities to author effects employing superimposition, ...