Wearable computers are the most recent generation of portable machines. Worn on the body, they provide constant access to computing and communications resources. In general, a wearable computer may be defined as a computer that is subsumed into the personal space of the user, controlled by the wearer and has both operational and interactional constancy, i.e. is always on and always accessible [...

Introductions are given to key technologies of various Mixed and Augmented Reality systems developed and realized at Beijing Institute of Technology. The automatic calibration method for the multi-projector systems is studied and a new constrained color-matching algorithm has been investigated to remove the color variations. The optical see-through head-mounted display (OST-HMD) utilizing an ul...

We propose a new scheme to recover the eye-contact between multiple users in a Shared Mixed-Reality Space. The eye-contact in a shared mixed-reality space is lost as the side effect of wearing head-mounted displays. We synthesize facial images in real-time with arbitrary poses and eye expressions by using several photographs of the user. The face images are overlaid in order to diminish the HMD...

Healthy participants are able to move forward within a virtual environment (VE) by the imagination of foot movement. This is achieved by using a brain-computer interface (BCI) that transforms thought-modulated electroencephalogram (EEG) recordings into a control signal. A BCI establishes a communication channel between the human brain and the computer. The basic principle of the Graz-BCI is the...

One potential application for virtual environments (VEs) is the training of spatial knowledge. A critical question is what features the VE should have in order to facilitate this training. Previous research has shown that people rely on environmental features, such as sockets and wall decorations, when learning object locations. The aim of this study is to explore the effect of varied environme...

Recovering the projection geometry of an X-ray system or an augmented reality video see-through Head Mounted Display (HMD) are mathematically quite similar. Recent work in both medical imaging and augmented reality use external optical sensors in order to recover the motion of the imaging system. In this paper, we take the example of the recovery of an X-ray projection geometry. We show that th...

This paper proposes a new method to design an optically-fabricated holographic element, where the construction optical system and the playback system can be optimized jointly. The method was driven by the use of a new holographic recording material – the photo-thermo-refractive (PTR) glass that can only be written at 325nm, while its playback takes place in the visible part of the spectrum. App...

Let’s commemorate the 100th anniversary of “pervaporation” by committing ourselves to position it as it deserves. Dear editor, this Submission is a letter to the Editor, and thus, a abstract does not apply.Therefore, this section will be used as a space for my comment or suggestion because it is needed for the next step. When we submit a letter to the editor,...

As monocular head-mounted displays (HMDs) are introduced into existing flight simulators for training and mission rehearsal it will be important to determine whether binocular rivalry affects the visibility of HMD presented symbology or the out-the-window (OTW) flight simulator display imagery. In the present study, we examined whether rivalry suppression could be objectively measured under con...

This paper describes a fast method of correcting for optical distortion in head-mounted displays (HMDs). Since the distorted display surface in an HMD is not rectilinear, the shape and location of the graphics window used with the display must be chosen carefully, and some corrections made to the predistortion model. A distortion correction might be performed with optics that reverse the distor...