Tracking of a see-through head-mounted display is a necessary precondition for proper overlay of virtual data and real scenes within the display. In our contribution, the intention and technique for Intraoperative Presentation will be presented. Focus will be the tracking of the display device. We will illustrate and compare three different optical tracking approaches and the results achieved b...

Tracking of objects in the spatiotemporal volume is a recent approach to solving the tracking problem. Graph cut based tools exist for tracking objects in the spatiotemporal volume, but these algorithms are still in the rudimentary stage and they require user interaction for successful tracking. In this paper an attempt to automate the tracking process is done by choosing appropriate energy fun...

An essential impact which can improve the indoor environment and save on power consumption for artificial lighting is utilization of daylight. Optical fiber daylighting technology offers a way to use direct daylight for remote spaces in a building. However, the existing paradigm based on the precise orientation of sunlight concentrator toward the Sun is very costly and difficult to install on t...

The effect of Earth albedo variation on the pointing and tracking subsystem of a planetaly optical communication package is analyzed. By studying the Cramer-Rao bound of the tracking error variance, it is shown that, when the Earth albedo is precisely known, the variance in spatial tracking error is inversely proportional to the total signal count. In contrast, a small uncertainty in the Earth ...

We have developed a new, unified implementation of the adaptive optics scanning laser ophthalmoscope (AOSLO) incorporating a wide-field line-scanning ophthalmoscope (LSO) and a closed-loop optical retinal tracker. AOSLO raster scans are deflected by the integrated tracking mirrors so that direct AOSLO stabilization is automatic during tracking. The wide-field imager and large-spherical-mirror o...

Optical tracking is a technology to localize the position and rotation of objects continuously with the help of optical cameras. Optical tracking is a basic technology used inmany applications. In augmented reality tracking is used to augment real objects with virtual informations. To place the informations at the right position, the position and viewing direction of the observer and that of th...

Free-space laser communication is a promising technology to meet the demand for cost-effective wideband support for future NASA missions. JPL has begun construction at the Table Mountain Facility in California of a 1-meter telescope system, known as the Optical Communication Telescope Laboratory (OCTL) and capable of tracking spacecraft from low Earth orbit to deep space, for development and va...

In this paper, a new concept for markerless optical tracking called “tracking with reference images” is introduced . This concept provides a flexible and praticable framework and is especially relevant for outdoor augmented-reality applications, for which no tracking solution currently exists. The implementation is achieved using an image matching technique, which compares the current live vide...

Optical tracking systems are widely adopted in surgical navigation. An optical tracking system is designed based on the principle of stereo vision with high-precision and low cost. This system uses optical infrared LEDs that are installed on the surgical instrument as markers and a near-infrared filter is added in front of the Bumblebee2 stereo camera lens to eliminate the interference of ambie...

This survey paper presents a classification of different challenges and tracking techniques in the field of augmented reality. The challenges in augmented reality are categorized into performance challenges, alignment challenges, interaction challenges, mobility/portability challenges and visualization challenges. Augmented reality tracking techniques are mainly divided into sensor-based tracki...