DocumentCode :
2577751
Title :
An extension to the analytical Gabor expansion with applications in image coding
Author :
Teuner, Andreas ; Nielsen, Per Asbeck ; Hosticka, Bedrich J.
Author_Institution :
Dept. of Electr. Eng., Duisburg Univ., Germany
fYear :
1994
fDate :
19-22 Apr 1994
Abstract :
We present an unified method that can be used to compute analytically the coefficients of the discrete non-orthogonal Gabor expansion for arbitrary type of orthogonal kernel. Based on the proposed algorithm an architecture is derived that enables a fast computation of modified time-frequency transforms such as Gabor-DCT. It is shown that for the special case of equidistant elementary cells the generalized Gabor transform can be modeled as a conventional block transform of modulated and filtered input signals. From this point of view it follows that the biorthogonal analysis window which is used in the modulation necessary for computation of the transform coefficients is independent of the selected orthogonal kernel. The problems caused by the non-stationarity of the modulated and filtered signal are discussed and the coding performance and energy compaction of the classical Gabor transform, the Gabor-DCT, and the well known block DCT are compared
Keywords :
discrete cosine transforms; filtering theory; image coding; modulation; time-frequency analysis; Gabor-DCT; algorithm; analytical Gabor expansion; biorthogonal analysis window; block DCT; block transform; coding performance; discrete nonorthogonal Gabor expansion; energy compaction; equidistant elementary cells; filtered input signals; generalized Gabor transform; image coding; modified time-frequency transforms; modulated input signals; nonstationarity; orthogonal kernel; transform coefficients; Discrete cosine transforms; Discrete transforms; Discrete wavelet transforms; Frequency; Gabor filters; Image analysis; Image coding; Kernel; Shape; Signal processing algorithms;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
ISSN :
1520-6149
Print_ISBN :
0-7803-1775-0
Type :
conf
DOI :
10.1109/ICASSP.1994.389444
Filename :
389444
Link To Document :
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