As users pan and zoom, display content can disappear into off-screen space, particularly on small-screen devices. The clipping of locations, such as relevant places on a map, can make spatial cognition tasks harder. Halo is a visualization technique that supports spatial cognition by showing users the location of off-screen objects. Halo accomplishes this by surrounding off-screen objects with ...

Research has shown that two popular forms of wearable tactile displays, a back array and a waist belt, can aid pedestrian navigation by indicating direction. Each type has its proponents and each has been reported as successful in experimental trials, however, no direct experimental comparisons of the two approaches have been reported. We have therefore conducted a series of experiments directl...

As users pan and zoom, display content can disappear into off-screen space, particularly on small-screen devices. The clipping of locations, such as relevant places on a map, can make spatial cognition tasks harder. Halo is a visualization technique that supports spatial cognition by showing users the location of offscreen objects. Halo accomplishes this by surrounding off-screen objects with r...

We describe a new method for accurately measuring the relationship between pixel coordinates of neighboring projectors in a tiled projection display. The method can be used to calibrate the alignment and distortions in the tiled display and to touch up existing calibrations with local corrections. Additionally, by simultaneously measuring the characteristic spacing of textural features on the s...

so that the display can be updated to maintain the illusion. Looking at a picture on a screen is very different from looking at a solid object. But ifthe picture changes correctly as the observer moves, we can create the illusion that there is a solid object “just behind” the screen. We have built such a display using only a domestic quality video camera and a Macintosh PowerPC computer The use...

A European Community directive issued in 1990 set down minimum requirements for health and safety of visual display equipment users. These requirements have now become a legal reality in the UK with the Parliamentary approval of the Health and Safety (Display Screen Equipment) Regulations 1992. While only a relatively small section of the legislation is directly relevant to optometric and dispe...

In the general aviation (GA) community, an automated aircraft is generally comprised of an integrated advanced avionics system consisting of a primary flight display (PFD), a multifunction display (MFD) including an instrumentcertified global positioning system (GPS) with traffic and terrain graphics, and a fully integrated autopilot. This type of aircraft is commonly known as an advanced avion...