On the optimality of a new class of 2D recursive filters

summary:The purpose of this paper is to prove the minimum variance property of a new class of 2D, recursive, finite-dimensional filters. The filtering algorithms are derived from general basic assumptions underlying the stochastic modelling of an image as a 2D gaussian random field. An appealing feature of the proposed algorithms is that the image pixels are estimated one at a time; this makes it possible to save computation time and memory requirement with respect to the filtering procedures based on strip processing. Experimental results show the effectiveness of the new filtering schemes

The invariant polynomial assignment problem for linear periodic discrete-time systems

Available on: http://pdf.dml.cz/bitstream/handle/10338.dmlcz/125363/Kybernetika_32-1996-6_8.pd

A B-splines based feedforward action for constrained optimization of PID controllers performance

This paper proposes a novel solution to a long standing problem: to define an inverse model-based feedforward action aimed at attaining an almost perfect transient tracking for PID controlled plants under constraints on the control effort and on the plant output. The new method situates in the recently proposed framework of pseudo inversion, which proved to be very effective to achieve an almost perfect tracking. The presented method assumes a B-spline function as the external reference forcing a given stable closed-loop system. The actual control input yielded by the external reference and forcing the plant is optimally approximated (in the least square sense) by a B-spline. The control points of the B-spline are chosen in such a way to satisfy the saturation constraints on the control effort. For a sufficiently accurate approximation, the exact fulfillment of saturation constraints from the B-spline are transferred to the actual control signal forcing the plant. The simulations on a practical case of a relevant interest show excellent results.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A B-spline-based pseudo-inversion approach for constrained optimal output transition

none3sirestrictedL. Jetto , V. Orsini, R. RomagnoliJetto, L.; Orsini, V.; Romagnoli, R