We have designed, developed, and tested a three-dimensional tracking and imaging system that uses a novel optical layout to acquire both en-face confocal images by scanning laser imaging (e.g. scanning laser ophthalmoscopy, SLO) and high-resolution depth sections by optical coherence tomography (OCT). The present application for this system is retinal imaging. The instrument is capable of seque...

This paper presents a feature point tracking algorithm using optical flow under the non-prior training active feature model (NPTAFM) framework. The proposed algorithm mainly focuses on analysis of deformable objects, and provides real-time, robust tracking. The proposed object tracking procedure can be divided into two steps: (i) optical flow-based tracking of feature points and (ii) NPT-AFM fo...

Interaction in Virtual Reality is accomplished through ”tracking devices”. These devices follow the position and orientation of real life objects, such as the user’s head and hands but also of other objects in order to provide a way to interact with virtual objects through objects in the real world. In this thesis we evaluate an optical tracking system for the Personal Space Station (PSS), a de...

PURPOSE Commercial optical tracking system such as BrainLab ExacTrac© suffers from ambiguous markers which can cause significant delay in patient treatment. We developed an ambiguity-free optical tracking system for high precision SBRT. METHODS The optical tracking system consists of a pair of camera sensors, 4∼8 infra-red (IR) reflective markers affixed on patient skin and in-house developed...

Optical tracking provides relatively high accuracy over a large workspace but requires line-of-sight between the camera and the markers, which may be difficult to maintain in actual applications. In contrast, inertial sensing does not require line-of-sight but is subject to drift, which may cause large cumulative errors, especially during the measurement of position. To handle cases where some ...

The Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research (4STAR) combines airborne sun tracking and sky scanning with diffraction spectroscopy to improve knowledge of atmospheric constituents and their links to air-pollution/climate. Direct beam hyper-spectral measurement of optical depth improves retrievals of gas constituents and determination of aerosol properties. Sky scanning e...

This paper explores the potential of near-field optical reflective sensing for musical instrument gesture capture. Near-field optical sensors are inexpensive, portable and nonintrusive, and their high spatial and temporal resolution makes them ideal for tracking the finer motions of instrumental performance. The paper discusses general optical sensor performance with detailed investigations of ...

Optical tracking has a great future in applications of virtual and augmented reality. It will assist to enhance the acceptance of virtual reality user interfaces, since optical tracking allows wireless interaction and precise tracking. Existing commercial motion capture systems are neither working reliably in real-time. Additionally, only few optical trackers can smooth and predict motion and i...

There are a large number of different approaches to vehicle tracking currently available. In this report we look at different problems faced when tracking vehicles, such as background subtraction and vehicle recognition, and look at possible solutions to these. We present a layered approach to vehicle tracking, which includes the use of background subtraction based on a statistical colour model...