Jeroen van Baar

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Surface elements (surfels) are a powerful paradigm to efficiently render complex geometric objects at interactive frame rates. Unlike classical surface discretizations, i.e., triangles or quadrilateral meshes, surfels are point primitives without explicit connectivity. Surfel attributes comprise depth, texture color, normal, and others. As a pre-process, an(More)
Modern laser range and optical scanners need rendering techniques that can handle millions of points with high resolution textures. This paper describes a point rendering and texture filtering technique called <i>surface splatting</i> which directly renders opaque and transparent surfaces from point clouds without connectivity. It is based on a novel screen(More)
Projectors are currently undergoing a transformation as they evolve from static output devices to portable, environment-aware, communicating systems. An enhanced projector can determine and respond to the geometry of the display surface, and can be used in an ad-hoc cluster to create a self-configuring display. Information display is such a prevailing part(More)
Handheld projection lets users create opportunistic displays on any suitable nearby surface. This projection method is a practical and useful addition to mobile computing. Incorporating a projector into a handheld device raises the issue of how to interact with a projection. The focus of the article is interactive projection: a technique for moving a cursor(More)
This paper describes how to instrument the physical world so that objects become self-describing, communicating their identity, geometry, and other information such as history or user annotation. The enabling technology is a wireless tag which acts as a radio frequency identity and geometry (RFIG) transponder. We show how addition of a photo-sensor to a(More)
In this paper we present a novel framework for direct volume rendering using a splatting approach based on elliptical Gaussian kernels. To avoid aliasing artifacts, we introduce the concept of a resampling filter combining a reconstruction with a low-pass kernel. Because of the similarity to Heckbert's EWA (elliptical weighted average) filter for texture(More)
With the increase in popularity of stereoscopic 3D imagery for film, TV, and interactive entertainment, an urgent need for editing tools to support stereo content creation has become apparent. In this paper we present an end-to-end system for object copy & paste in a stereoscopic setting to address this need. There is no straightforward extension of 2D copy(More)
Designing interfaces for interactive handheld projectors is an exiting new area of research that is currently limited by two problems: hand jitter resulting in poor input control, and possible reduction of image resolution due to the needs of image stabilization and warping algorithms. We present the design and evaluation of a new interaction technique,(More)
Curved screens are increasingly being used for high-resolution immersive visualization environments. We describe a new technique to display seamless images using overlapping projectors on curved quadric surfaces such as spherical or cylindrical shape. We exploit a quadric image transfer function and show how it can be used to achieve sub-pixel registration(More)