Transcatheter aortic valve implantation (TAVI) is routinely performed under 2D fluoroscopic guidance. The target position for placement of the stented aortic valve prosthesis is defined by aortic valve landmarks, e.g. coronary ostia. This paper presents a real-time tracking method of these landmarks in 2D fluoroscopic image sequences to improve the positioning of the implant during TAVI. The pr...

Methods have been presented to compute the vector representations of the arbitrary lines in a bilevel raster image. The image may have varying line width and irregular boundaries. Moreover, at line crossings and branches, the user has an opportunity to choose the direction in which line tracking may be continued. The usual method involves thresholding, thinning, segmentation, polygonalization, ...

We present a framework for tracking contours in 2D image sequences by taking into account the motion information and correspondence between contour points. With this framework, The tracking problem can be divided into two steps: i) Contour detection using general internal and external energies in separate frames, and ii) Tracking and refining contours using motion information of the entire imag...

This paper presents a visual tracking system that is capable of running real time on-board a small UAV (Unmanned Aerial Vehicle). The tracking system is computationally efficient and invariant to lighting changes and rotation of the object or the camera. Detection and tracking is autonomously carried out on the payload computer and there are two different methods for creation of the image patch...

A system for video tracking of a moving object by the robot-held camera is presented, and efficient tracking methods are proposed. We describe our initial implementation of a system which is capable of tracking a single moving object against highly textured background. A pyramid-based image processor, PVM-1 is employed to support some fast algorithms in locating the moving object from the diffe...

In this paper we present a management model to deal with the problem of tracking a large number of features during long image sequences. Some usual difficulties are related to this problem: features may be temporarily occluded or might even have disappeared definitively; the computational cost involved should always be reduced to the strictly necessary. The proposed Net Present Value (NPV) mode...