Xianliang Wu

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An explicit fourth-order finite-difference time-domain (FDTD) scheme using the symplectic integrator is applied to electromagnetic simulation. A feasible numerical implementation of the symplectic FDTD (SFDTD) scheme is specified. In particular, new strategies for the air–dielectric interface treatment and the near-to-far-field (NFF) transformation are(More)
A method for feature selection in visual simultaneous localization and mapping (SLAM) is presented based on the potential data association cost. It is put into practice through a mechanism termed predictive virtual matching test, which measures the goodness of any new feature by examining the predictive repeatability and compatibility with the other(More)
In this paper, some existing keypoint extraction algorithms, including Harris, SIFT, SURF and CenSurE, are analyzed and evaluated based on images containing view, scale and rotation changes. After these algorithms are introduced, analysis on Harris and SIFT detectors has been carried out, which can lead to better understanding about their performances.(More)
Echocardiography is a potential alternative to X-ray fluoroscopy in cardiac catheterization given its richness in soft tissue information and its lack of ionizing radiation. However, its small field of view and acoustic artifacts make direct automatic segmentation of the catheters very challenging. In this study, a fast catheter segmentation framework for(More)
BACKGROUND Trans-catheter endovascular stent grafting minimizes trauma and increases the benefitting patient population. However, the alignment between stent graft branches and vasculature branches remains time-consuming and challenging, and such techniques require a significant amount of contrast agent for imaging. METHODS A new framework for(More)
A high-order symplectic finite-difference time-domain (SFDTD) scheme using the diagonal split-cell model is presented to analyze electromagnetic scattering of the curved three-dimensional perfectly conducting objects. On the one hand, for the undistorted cells, the fourth-order accurate spatial difference is employed. On the other hand, for the completely(More)
Using the three-order symplectic integrators and fourth-order collocated spatial differences, a highorder symplectic finite-difference time-domain (SFDTD) scheme is proposed to solve the time-dependent Schrödinger equation. First, the high-order symplectic framework for discretizing a Schrödinger equation is described. Then the numerical stability and(More)