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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. An extension to the analytical Gabor expansion with applications in image coding
 Institute of Electrical and Electronics Engineers IEEE: IEEE International Conference on Acoustics, Speech, and Signal Processing 1994. Proceedings. Vol.5: I Image and multidimensional signal processing Piscataway/N.J.: IEEE Order Department, 1994 ISBN: 0780317750 ISBN: 0780317769 ISBN: 0780317777 pp.585588 
 International Conference on Acoustics, Speech and Signal Processing (ICASSP) <19, 1994, Adelaide> 

 English 
 Conference Paper 
 Fraunhofer IMS () 
 data compression; Datenreduktion; digital image processing; digitale Bildverarbeitung; Gabortransformation; transformation 
Abstract
In this contribution we present an unified method that can be used to compute analytically the coefficients of the discrete nonorthogonal Gabor expansion for arbitrary type of orthogonal kernel. Based on the proposed algorithm an architecture is derived that enables a fast computation of modified timefrequency transforms such as GaborDCT. It will 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 nonstationarity of the modulated and filtered signal will be discussed and the coding performance and energy compaction of the classical Gabor transform, the GaborDCT, and the well known block DCT will be compared.