the problem of relative motion control for spacecraft formation flying in eccentric orbits is considered in this paper. due to the presence of nonlinear dynamics and external disturbances, a robust fuzzy sliding mode controller is developed. the slopes of sliding surfaces of the conventional sliding mode controller are tuned according to error states using a fuzzy logic and reach the pre-define...

This paper presents an overview of an object detection and tracking method used in SETh system (Simple Enemy Tracking). Most of visual systems use only motion features to detect and track objects of interest. Object tracking is a complex problem and thus cannot be solved using only motion data [6]. There are numerous cases where it is required to detect only, for example, small red moving objec...

Vision-based tracking systems for augmented reality often require that artificial fiducials be placed in the scene. In this paper we utilize our approach for robust detection and tracking of natural features such as textures or corners. The tracked natural features are automatically calibrated to the fiducials that are used to initialize and facilitate normal tracking. Once calibrated, the natu...

PURPOSE Dynamically compensating for target motion during radiotherapy will increase treatment accuracy. A laboratory system for real-time target tracking with a dynamic MLC has been developed. In this study, the geometric accuracy limits of this DMLC target tracking system were evaluated. METHODS AND MATERIALS A motion simulator was programmed to follow patient-derived tumor motion paths, pa...

This paper introduces a mesh-based motion estimation scheme for image sequences and nodal motion vectors optimization by using a multi-resolution diieren-tial method. Because our nal aim is mesh tracking throughout a video sequence, neither backward tracking nor forward tracking is well suited. The backward tracking provides good results when simply applied to two successive images, but it is d...

This paper discusses control of multichannel sound diffusion by means of motion-tracking hardware and software within the context of a live performance. The idea developed from the author’s previous use of motion-tracking technology in his own artistic practice as a composer and performer. Various motion tracking systems were considered, experiments were conducted with three sound diffusion set...

Tracking organ motion due to respiration is important to enable precise interventions in the regions of the abdomen and thorax. Respiratory induced motion in these regions may limit the accuracy of interventions which do not employ some type of tracking. One method of tracking organ motion is to use a predictive model based on external tracking that is correlated to internal motion. This approa...

Accurate estimation of motion from time-varying imagery has been a popular problem in vision studies, This information can be used in segmentation, 3D motion and shape recovery, target tracking, and other problems in scene analysis and interpretation. We have presented a dynamic image model for estimating image motion from image sequences, and have shown how the solution can be obtained from a ...