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Title: Frequency analysis of contour orientation functions for shape representation and motion analysis
Authors: Alemán-Flores, Miguel 
Álvarez-Leon, Luis 
Moreno-Díaz, Roberto 
UNESCO Clasification: 220990 Tratamiento digital. Imágenes
120601 Construcción de algoritmos
120602 Ecuaciones diferenciales
120326 Simulación
Keywords: Edge orientations
Energy functions
Fourier coefficients
Frequency Analysis
Global illumination change, et al
Issue Date: 2003
Journal: Lecture Notes in Computer Science 
Conference: 9th International Workshop on Computer Aided Systems Theory 
Abstract: The location and characterization of edges is a crucial factor for some image processing tasks, such as shape representation and motion analysis. In this paper, we present a set of filters which allow estimating edge orientation and whose output does not vary when the input signal is rotated or when a global illumination change occurs. The outputs of these filters are used to extract a one-dimensional representation of the contour in order to characterize shapes in an accurate way by using Fourier coefficients. An energy function is built to associate shapes and determine the similarities between object contours. The elements of this energy function are weighted so that those which provide the most relevant information have a larger contribution. By extracting the parameters of the transformations which relate every image in a sequence with the following, we can determine the temporal evolution of a moving object.
ISBN: 978-3-540-20221-9
ISSN: 0302-9743
DOI: 10.1007/978-3-540-45210-2_58
Source: Moreno-Díaz R., Pichler F. (eds) Computer Aided Systems Theory - EUROCAST 2003. EUROCAST 2003. Lecture Notes in Computer Science, vol 2809. Springer, Berlin, Heidelberg
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