| Entropy-constrained vector quantization (ECVQ) 3] offers substantially improved image quality over vector quan-tization (VQ) at the cost of additional encoding complexity. We extend results in the literature for fast nearest neighbor search of VQ to ECVQ. We use a new, easily computed distance that successfully eliminates most codewords from consideration.

Entropy-constrained vector quantization (ECVQ) offers substantially improved image quality over vector quantization (VQ) at the cost of additional encoding complexity. We extend results in the literature for fast nearest neighbor search of VQ to ECVQ. We use a new, easily computed distance that successfully eliminates most codewords from consideration.

In this paper, a new perceptually weighted Euclidean distance function is proposed for the VQ of the speech signal. It employs a logarithmic preprocessing and utilizes the listening characteristics of the ear for the definition of the perceptually weighted Euclidean distance function. Simulation results show that the proposed VQ process has less spectral distortion (SD) than its conventional Eu...

Given a matrix A el.* and a vector V0e1. 2 we détermine if there exists an integer m— 1 m and m positive integers am^1 . . . aQ such that A m VQ— £ axA l VQ. When such an m exists^ we compute the smallest one and m positive integers am^.1 . . . a0 that satisfy the relation.

This paper proposes a nearest neighbor classifier design method based on vector quantization (VQ). By investigating the error distribution pattern of the training set, the VQ technique is applied to generate prototypes incrementally until the desired classification result is reached. Experimental results demonstrate the effectiveness of the method. 2004 Elsevier B.V. All rights reserved.

In this paper, we explore a canonical connection between the algebra of q-difference operators V˜q, affine Lie algebras and vertex associated to certain subalgebra A gl∞. We also introduce study category R V˜q-modules. More precisely, obtain realization V˜q as covariant A⁎ˆ, where A⁎ is 1-dimensional central extension A. prove that restricted Vq˜-modules level ℓ12 correspond Z-equivariant ϕ-coo...

Let {Vq}q be a complex one-parameter family of smooth hypersurfaces in a toric variety. In this paper, we give a concrete description of the monodromy transformation of {Vq}q around q = ∞ in terms of tropical geometry. The main tool is the tropical localization introduced by Mikhalkin.

This paper proposes a real-time variable-Q non-stationary Gabor transform (VQ-NSGT) system for speech pitch shifting. The system allows for time-frequency representations of speech on variable-Q (VQ) with perfect reconstruction and computational efficiency. The proposed VQ-NSGT phase vocoder can be used for pitch shifting by simple frequency translation (transposing partials along the frequency...