Open Access

Flat Zone Analysis and a Sharpening Operation for Gradual Transition Detection on Video Images

  • Silvio J.F. Guimarães1, 2Email author,
  • Neucimar J. Leite3,
  • Michel Couprie1 and
  • Arnaldo de A. Araújo4
EURASIP Journal on Advances in Signal Processing20042004:578032

Received: 1 September 2003

Published: 29 September 2004


The boundary identification represents an interesting and difficult problem in image processing, mainly if two flat zones are separated by a gradual transition. The most common edge detection operators work properly for sharp edges, but can fail considerably for gradual transitions. In this work, we propose a method to eliminate gradual transitions, which preserves the number of the image flat zones. As an application example, we show that our method can be used to identify very common gradual video transitions such as fades and dissolves.

Keywords and phrases

flat zone analysisvideo transition identificationvisual rhythm

Authors’ Affiliations

Laboratoire Algorithmique et Architecture des Systèmes Informatiques, École Supérieure d'Ingénieurs en Électronique et Électrotechnique
Institute of Computing, Pontifical Catholic University of Minas Gerais
Institute of Computing, State University of Campinas
Computer Science Department, Universidade Federal de Minas Gerais


© Guimarães et al. 2004