This paper presents a robust algorithm for automated registration of images related by rigid-body transformations. This algorithm uses a new region-based similarity metric , which enables accurate registration of images of large contrast diierences. Region segmentation required by the metric is accomplished using a multiscale segmentation algorithm , and minimization of this metric is done usin...

On-line fault detection in sensor networks is of paramount importance due to the convergence of a variety of challenging technological, application, conceptual, and safety related factors. We introduce a taxonomy for classi£cation of faults in sensor networks and the £rst on-line model-based testing technique. The approach is generic in the sense that it can be applied on an arbitrary system of...

The popular BFGS quasi-Newton minimization algorithm under reasonable conditions converges globally on smooth convex functions. This result was proved by Powell in 1976: we consider its implications for functions that are not smooth. In particular, an analogous convergence result holds for functions, like the Euclidean norm, that are nonsmooth at the minimizer.

In this work, we investigate stochastic quasi-Newton methods for minimizing a finite sum of cost functions over decentralized network. We first develop general algorithmic framework, in which each node constructs local, inexact direction that asymptotically approaches the global, exact one at time step. To do so, local gradient approximation is constructed using dynamic average consensus to tra...

Recovery of common agricultural weeds after burial by soil was studied in four greenhouse and three field experiments. Species studied included velvetleaf, Powell amaranth, common lambsquarters, barnyardgrass, and giant foxtail. Seedlings were bent over before burial to simulate the effect of the impact of soil thrown by a cultivator. Altogether, more than 35,000 seedlings were marked and obser...

Particle swarm optimization (PSO) is an evolutionary algorithm known for its simplicity and effectiveness in solving various optimization problems. PSO should have strong yet balanced exploration and exploitation capabilities to enhance its performance. A superior solution guided PSO (SSG-PSO) framework integrated with an individual level based mutation operator and different local search techn...

It is observed that the Powell-Sabin 12-split triangle is reen-able since the same split of the 4 similar subtriangles of a triangle contains the lines of split of the original triangle. This property of the split is the key to the existence of a subdivision scheme, for the evaluation of the C 1 quadratic spline on the split which interpolates function and gradient values at the 3 vertices of t...

Y 2 An algorithm Is proposed for minimizing certain nice C functions f on E assuming only a computational knowledge of f and 7f. It Is shown that the algorithm provides global convergence at a rate which is eventually superlinear and possibly quadratic. The algorithm is purely algebraic and does not require the minimization of any functions of one variable. Numerical computation on specific pro...

Incorporating computers into daily K-12 classroom teaching promises to benefit student learning, and improve teaching practice substantially. Computer enhanced curricula may enable more teachers to create exploratory and inquiry based lessons, but in most cases supporting software have only been realized as practice tools for specific rote learning skills. Drills do little to help students deve...