SIVIGNON
Isabelle
Chargée de Recherche CNRS
Research

Download code/softwares

Note: If no licence is specified, all these codes are freely available but without any warranty.

Here are some codes/softwares related to digital or computational geometry.


Digital surface decomposition into digital planes




Simplification of a digital curve



Fast computation of the characteristics of a Digital Straight Line Subsegment



Union of Digital Straight Segments

  • Implementation of the algorithm presented in "Algorithms for Fast Digital Straight Segments Union". Isabelle Sivignon, International Conference on Discrete Geometry for Computer Imagery 2014, Springer LNCS 344-357. It computes the minimal characteristics of the digital straight line containing two given digital straight segments. The code is part of the DGtal library, as a method of the class ArithmeticalDSS.


Fraction of smallest denominator in between two irreducible fractions



(δ-ε)-ball approximation of a shape

  • In "(δ,ε)-ball approximation of a shape: definition and complexity", we prove that the problem is NP-complete. The proof is made through a reduction from a variant of the vertex cover problem, with a well-defined geometric construction for any cubic planar graph. In appendix of the article, we provide a specific vertex gadget for degree-three vertices when δ=0 and claim that this gadget actually remains valid for any value of δ We provide here a Geogebra file that give a parameterized generic construction of this gadget for any values of δ and ε.


Other material concerning digital geometry is available on the IAPR-TC18 webpage.

Grenoble Images Parole Signal Automatique laboratoire

UMR 5216 CNRS - Grenoble INP - Université Joseph Fourier - Université Stendhal