In eye tracking research, finding eye movement patterns and similar strategies between participants’ eye movements is important to understand task solving strategies and obstacles. In this application paper, we present a graph comparison method using radial graphs that show Areas of Interest (AOIs) and their transitions. An analyst investigates a single graph based on dwell times, directed tran...

The problem of object tracking is of considerable interest in the scientific community and it is still an open and active field of research. In this paper we address the comparison of two different specific purpose architectures for object tracking based on motion and colour segmentation. On one hand, we have developed a new multi-object segmentation device based on an existing optical flow est...

This tutorial paper discusses the performance requirements and design parameters for Electro-Optical Tracking Systems. Descriptions of tracking systems for range instrumentation are discussed. The relationships between the performance requirements, target characteristics and the system optical sensors, tracking algorithms, pedestal dynamics, servo control loops, and ancillary equipment are exam...

Saliency maps are used to understand human attention and visual fixation. However, while very well established for static images, there is no general agreement on how to compute a saliency map of dynamic scenes. In this paper we propose a mathematically rigorous approach to this problem, including static saliency maps of each video frame for the calculation of the optical flow. Taking into acco...

Optical flow can be used to segment a moving object from its background provided the velocity of the object is distinguishable from that of the background, and has expected characteristics. Existing optical flow techniques often detect flow (and thus the object) in the background. To overcome this, we propose a new optical flow technique, which only determines optical flow in regions of motion....

This paper proposes a multiple hypothesis tracking for multiple object tracking with moving camera. The proposed model makes use of the stability of sparse optical flow along with the invariant colour property under size and pose variation, by merging the colour property of objects into optical flow tracking. To evaluate the algorithm five different videos are selected from broadcast horse race...

This paper presents a hierarchical multi-resolution estimation of optical flow for a vehicle tracking system which can be used in a practical environment. Aiming at accurate estimation of optical flow, we construct a strong feature tracking system based on the Shi-Tomasi approach. As a feature detector, we use a Scale-Invariant Feature Transform (SIFT) algorithm, which not only firmly focuses o...

Motion tracking systems are commonly used in virtual reality-based interventions to detect movements in the real world and transfer them to the virtual environment. There are different tracking solutions based on different physical principles, which mainly define their performance parameters. However, special requirements have to be considered for rehabilitation purposes. This paper studies and...

Real-time target localization in ultrasound is useful in many clinical and scientific areas. For example in radiation therapy tumors can be localized in real-time and irradiated with a high accuracy. To measure the position of an ultrasound target in a global coordinate system or to extend the tracking volume by moving the ultrasound transducer an optical marker is attached to it and observed b...

An experimental tracking optical coherence tomography (OCT) system has been clinically tested. The prototype instrument uses a secondary sensing beam and steering mirrors to compensate for eye motion with a closed-loop bandwidth of 1 kHz and tracking accuracy, to within less than the OCT beam diameter. The retinal tracker improved image registration accuracy to <1 transverse pixel (<60 microm)....