The basic free-space optical communication system includes at least two satellites. To communicate between them, the transmitter satellite must track the beacon of the receiver satellite and point the information optical beam in its direction. Optical tracking and pointing systems for free space suffer during tracking from high-amplitude vibration because of background radiation from interstell...

We present a model based approach to the integration of multiple cues for tracking high degree of freedom articulated motions and model refinement. We then apply it to the problem of hand tracking using a single camera sequence. Hand tracking is particularly challenging because of occlusions, shading variations, and the high dimensionality of the motion. The novelty of our approach is in the co...

Modern surgery is transitioning from traditional open surgery to minimally invasive procedures, and intra-operative imaging is increasingly used to refine surgical planning and to precisely target regions of interest. One fundamental requirement for image-guided interventions is the accurate knowledge about the spatial relations between all objects of interest. We critically review clinically e...

In this paper, an optical tracking system is introduced for the use in augmented reality (AR). Only a few AR-systems currently exist which are using stereo-vision techniques to estimate the viewing pose. The presented system uses binocular images and retrore#ective markers in order to speed up the tracking process and make it more precise and robust. The camera calibration as well as the pose e...

Fixational eye movements remain a major cause of artifacts in optical coherence tomography (OCT) images despite the increases in acquisition speeds. One approach to eliminate the eye motion is to stabilize the ophthalmic imaging system in real-time. This paper describes and quantifies the performance of a tracking OCT system, which combines a phase-stabilized optical frequency domain imaging (O...

INTRODUCTION In MR guided interventional procedures, image planes are required to include the needle path accurately. For the purpose, an optical or electromagnetic tracking system has been used. The optical tracking system precisely works in the strong magnetic fields, but line of sight must be maintained. Surgical procedure and instruments easily obstruct the light path and applicable angles ...

-In the time optimal control problem, it is important to select a switching point accurately in order to improve tracking speed performance. However, the accurate selection of the switching point is not an easy task because of the damping coefficient variations and modeling uncertainties in actual systems. To relieve the difficulty and inconvenience of this task, adaptive model-following contro...

Using results from robust Kalman filtering, we present a new Kalman filter-based snake model for tracking of nonrigid objects in combined spatio-velocity space. The proposed model is the stochastic version of the velocity snake, an active contour model for combined tracking of position and velocity of nonrigid boundaries. The proposed model uses image gradient and optical flow measurements alon...

Positional tracking can be implemented with a variety of technologies. Commercially-available systems include mechanical trackers, magnetic trackers, ultrasonic trackers, and GPS or WIFI-based tracking. The most widely used technology, however, is optical tracking. In optical tracking, one or more cameras observe a set of reference points, for example infrared LEDs or actively illuminated retro...

For most optical tweezer applications, precise and reliable tracking of the trapped particle is an important requirement. Backfocal-plane interferometry is the fastest and most accurate tracking technique if the particle displacements are limited to half of the focal width. Especially for positive axial displacements, the nonlinear detector response can lead to incorrect tracking results. Here ...