Results 11 to 20 of about 1,050,746 (241)
Novel affine‐invariant curve descriptor for curve matching and occluded object recognition
IET Computer Vision, 2013 The authors present a new approach for affine distorted planar curve matching and exploit it for occluded object recognition. There are two main contributions in the study: First, a novel affine‐invariant curve descriptor (AICD) based on a new‐defined ...
Huijing Fu +3 more
doaj +2 more sources
Analysis of uniform binary subdivision schemes for curve design [PDF]
, 1988 The paper analyses the convergence of sequences of control polygons produced by a binary subdivision scheme of the form .0,1,2,...kz,ikj,ifjbm0j1k12ifjam0j1k2if=∈+Σ==++Σ==+ The convergence of the control polygons to a Cu curve is analysed in terms of ...
Gregory, JA, Dyn, N, Levin, D
core +7 more sources
A Compact and Complete AFMT Invariant with Application to Face Recognition [PDF]
, 2005 In this paper, we present a complete set of hybrid similarity invariants under the Analytical Fourier-Mellin Transform (AFMT) framework, and apply it to invariant face recognition. Because the magnitude and phase spectra are not processed separately,
Yu, Hongchuan, Bennamoun, Mohammed
core +9 more sources
Mather β-Function for Ellipses and Rigidity
Entropy, 2022 The goal of the first part of this note is to get an explicit formula for rotation number and Mather β-function for ellipse. This is done here with the help of non-standard generating function of billiard problem. In this way the derivation is especially
Michael Bialy
doaj +1 more source
Demonstratio Mathematica, 2023 The classification of the phase portraits is one of the classical and difficult problems in the qualitative theory of polynomial differential systems in R2{{\mathbb{R}}}^{2}, particularly for quadratic systems.
Benterki Rebiha, Belfar Ahlam
doaj +1 more source
Synchronization of coupled generators of quasi-periodic oscillations upon destruction of invariant curve [PDF]
Известия высших учебных заведений: Прикладная нелинейная динамика, 2021 The purpose of this study is to describe the complete picture of synchronization of two coupled generators of quasi-periodic oscillations, to classify various types of synchronization, to study features of occurrence and destruction of multi-frequency ...
Kuznetsov, Aleksandr Petrovich +2 more
doaj +1 more source
Polynomial differential systems with hyperbolic algebraic limit cycles
Electronic Journal of Qualitative Theory of Differential Equations, 2020 For a given algebraic curve of degree $n$, we exhibit differential systems of degree greater than or equal $n$, by introducing functions which are solutions of certain partial differential equations.
Salah Benyoucef
doaj +1 more source
Stability of a certain class of a host–parasitoid models with a spatial refuge effect
Journal of Biological Dynamics, 2020 A certain class of a host–parasitoid models, where some host are completely free from parasitism within a spatial refuge is studied. In this paper, we assume that a constant portion of host population may find a refuge and be safe from attack by ...
E. Bešo +3 more
doaj +1 more source
The invariant rings of the Sylow groups of GU(3,q2), GU(4,q2), Sp(4,q) and O+(4,q) in the natural characteristic [PDF]
, 2016 Let G be a Sylow p -subgroup of the unitary groups GU(3,q2)GU(3,q2), GU(4,q2)GU(4,q2), the symplectic group Sp(4,q)Sp(4,q) and, for q odd, the orthogonal group O+(4,q)O+(4,q).
Fleischmann, Peter +2 more
core +1 more source
E-strings, F 4, and D 4 triality
Journal of High Energy Physics, 2023 We study the E-string theory on ℝ4 × T 2 with Wilson lines. We consider two examples where interesting automorphisms arise. In the first example, the spectrum is invariant under the F 4 Weyl group acting on the Wilson line parameters.
Kazuhiro Sakai
doaj +1 more source