Optical Tracking using ARToolkit provides us with the base technology for a wealth of Augmented Reality applications. However, marker-based optical tracking using a single camera has some drawbacks. Markers must be fully visible to the camera all the time to produce tracking output – occlusion by other objects and limited camera field of view constrain the area that can be effectively tracked b...

In this paper, we present an observation model based on the Lucas and Kanade algorithm for computing optical flow, to track objects using particle filter algorithms. Although optical flow information enables us to know the displacement of objects present in a scene, it cannot be used directly to displace an object model since flow calculation techniques lack the necessary precision. In view of ...

We are investigating the application of CCD camera based optical beacon tracking systems in d interactive environments An optical tracking system has been developed which serves as a testbed for tracking algorithms and accuracy investigations The d interactive environment fea tures tracking of the observer s viewpoints stereo scopic visualization and direct d pointing The focus is set on high a...

Optical tracking is often combined with conventional flat panel solar cells to maximize electrical power generation over the course of a day. However, conventional trackers are complex and often require costly and cumbersome structural components to support system weight. Here we use kirigami (the art of paper cutting) to realize novel solar cells where tracking is integral to the structure at ...

Introduction One of the main goals for the UbiCom position tracking system is an accuracy in the centimeter range and a latency of 2 ms. We planned to use inertial tracking to reach the latency requirements, but inertial trackers have drift. The main job of the additional tracking system is to resolve this drift problem. We chose to use a camerabased tracker for this. Depending on the drift of ...

Motion tracking has been employed by industry for many years but has remained an expensive and difficult process. Specialist equipment and the requirement for a highly controlled environment are obstacles stopping tracking from breaking into the consumer market. This project aims to demonstrate that high accuracy optical tracking can be achieved using inexpensive video cameras in an unconstrain...

Two difficult issues in optical flow are motion discontinuities and large interframe motion. We present an algorithm that addresses both issues by first performing feature tracking and motion segmentation and then warping one of the images to reduce the interframe motion and avoid the motion discontinuities. The algorithm consists of three major phases: 1) feature selection, 2) feature tracking...

Tracking a randomly varying optical phase is a key task in metrology, with applications in optical communication. The best precision for optical-phase tracking has until now been limited by the quantum vacuum fluctuations of coherent light. Here, we surpass this coherent-state limit by using a continuous-wave beam in a phase-squeezed quantum state. Unlike in previous squeezing-enhanced metrolog...

Active image stabilization for an adaptive optics scanning laser ophthalmoscope (AOSLO) was developed and tested in human subjects. The tracking device, a high speed, closed-loop optical servo which uses retinal features as tracking target, is separate from AOSLO optical path. The tracking system and AOSLO beams are combined via a dichroic beam splitter in front of the eye. The primary tracking...