Work-Optimal thinning algorithm on SIMD machines

  • Ubéda Stéphane
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 805)


We proposes a parallel thinning algorithm for binary pictures. Given an N × N image including an object, our algorithm computes in O(N2) the skeleton of the object, using a pyramidal decomposition of the picture. With the Exclusive Read Exclusive Write (EREW) Parallel Random Access Machine (PRAM), our algorithm runs in O(log N) time using O(N2/log N) processors. Same complexity is obtained using an SIMD hypercube. Both the PRAM and the Hypercube algorithms are workoptimal. We describe the basic operator, the pyramidal algorithm and some experimental results.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1994

Authors and Affiliations

  • Ubéda Stéphane
    • 1
    • 2
  1. 1.Laboratoire d'Informatique ThéoriqueEcole Polytechnique Fédérale de LausanneLausanneSwitzerland
  2. 2.Facultés des Sciences et TechniquesLaboratoire de Traitement du Signal et Instrumentation CNRS-URA 842St-Etienne Cedex 2France

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