On the cohomology of 3D digital images

Authors:
Rocío González-Díaz;Pedro Real
Affiliations:
Depto. de Matemática Aplicada I, Escuela Superior de Ingeniería Informática, Universidad de Sevilla, Avda. Reina Mercedes, s/n, 41012 Sevilla, Spain;Depto. de Matemática Aplicada I, Escuela Superior de Ingeniería Informática, Universidad de Sevilla, Avda. Reina Mercedes, s/n, 41012 Sevilla, Spain
Venue:
Discrete Applied Mathematics - Special issue: Advances in discrete geometry and topology (DGCI 2003)
Year:
2005

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Abstract

We propose a method for computing the cohomology ring of three-dimensional (3D) digital binary-valued pictures. We obtain the cohomology ring of a 3D digital binary-valued picture I, via a simplicial complex K(I) topologically representing (up to isomorphisms of pictures) the picture I. The usefulness of a simplicial description of the "digital" cohomology ring of 3D digital binary-valued pictures is tested by means of a small program visualizing the different steps of the method. Some examples concerning topological thinning, the visualization of representative (co)cycles of (co)homology generators and the computation of the cup product on the cohomology of simple pictures are showed.