Computation of cubical homology, cohomology, and (co) homological operations via chain contraction

P Pilarczyk, P Real - Advances in Computational Mathematics, 2015 - Springer
We introduce algorithms for the computation of homology, cohomology, and related
operations on cubical cell complexes, using the technique based on a chain contraction …

A parallel homological spanning forest framework for 2D topological image analysis

F Diaz-del-Rio, P Real, DM Onchis - Pattern recognition letters, 2016 - Elsevier
Abstract In [14], a topologically consistent framework to support parallel topological analysis
and recognition for 2D digital objects was introduced. Based on this theoretical work, we …

[PDF][PDF] Cohomology theory for digital images

O Ege, I Karaca - Romanian Journal of Information Science and …, 2013 - romjist.ro
In this paper we propose a mathematical framework that can be used for defining
cohomology of digital images. We state the Eilenberg-Steenrod axioms and the Universal …

Skeletonisation algorithms with theoretical guarantees for unorganised point clouds with high levels of noise

P Smith, V Kurlin - Pattern Recognition, 2021 - Elsevier
Data Science aims to extract meaningful knowledge from unorganised data. Real datasets
usually come in the form of a cloud of points. It is a requirement of numerous applications to …

Connectivity calculus of fractal polyhedrons

H Molina-Abril, P Real, A Nakamura, R Klette - Pattern Recognition, 2015 - Elsevier
The paper analyzes the connectivity information (more precisely, numbers of tunnels and
their homological (co) cycle classification) of fractal polyhedra. Homology chain contractions …

[HTML][HTML] Parallel homological calculus for 3D binary digital images

F Díaz-del-Río, H Molina-Abril, P Real… - Annals of Mathematics …, 2024 - Springer
Topological representations of binary digital images usually take into consideration different
adjacency types between colors. Within the cubical-voxel 3D binary image context, we …

[HTML][HTML] Allowing cycles in discrete Morse theory

A Gonzalez-Lorenzo, A Bac, JL Mari, P Real - Topology and its Applications, 2017 - Elsevier
Discrete gradient vector fields are combinatorial structures that can be used for accelerating
the homology computation of CW complexes, such as simplicial or cubical complexes, by …

Toward parallel computation of dense homotopy skeletons for nD digital objects

P Real, F Diaz-del-Rio, D Onchis - International Workshop on …, 2017 - Springer
An appropriate generalization of the classical notion of abstract cell complex, called primal-
dual abstract cell complex (pACC for short) is the combinatorial notion used here for …

Membrane parallelism for discrete Morse theory applied to digital images

R Reina-Molina, D Díaz-Pernil, P Real… - Applicable Algebra in …, 2015 - Springer
In this paper, we propose a bio-inspired membrane computational framework for
constructing discrete Morse complexes for binary digital images. Our approach is based on …

Generating (co) homological information using boundary scale

H Molina-Abril, P Real, F Díaz-del-Río - Pattern Recognition Letters, 2020 - Elsevier
In this paper we develop a new computational technique called boundary scale-space
theory. This technique is based on the topol 1 ogical paradigm consisting of representing a …