Representaciones conjuntas espacio-frecuencia en Psicofísica VisualFundamentos ID
ISSN: 0214-3550, 1579-3702
Ano de publicación: 2000
Volume: 12
Número: 2
Páxinas: 171-222
Tipo: Artigo
Outras publicacións en: Cognitiva
Resumo
This paper describes the basic principles and the main techniques in the joint space-frequency analysis of 1D signals, giving a detailed description of the joint representations that have been used in visual psychophysics: the Wigner Distribution Function, the Gabor and windowed Fourier transform (which are the basis of the spectrogram that is so popular in experimental psychology), and the wavelet transform. Unlike in other papers covering this topic, here these three joint transforms are presented as integral transforms associated with some classes of generalized coherent states. A set of synthetic signals are used to show intuitively the efficacy of each representation as regards both the description of the spatial structure of the signals and the estimation of their space-varying (or space-invariant) spectra.