Results 211 to 220 of about 1,089 (246)
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A novel translation and modulation invariant discrete-discrete uncertainty measure
IEEE International Conference on Acoustics Speech and Signal Processing, 2002The quantification of signal localization simultaneously in time and in frequency is fundamental to a variety of signal processing applications where time-frequency analysis is to be performed on nonstationary signals. In this paper, we develop novel joint localization measures defined on equivalence classes of finitely supported discrete-time signals.
null Tay, null Havlicek, null DeBrunner
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2015
A set $\Lambda$ is called $p$-spectral if there is a function $g \in L^p (\mathbb{R})$ such that all $\Lambda$-translates $\{g(t-\lambda),\lambda \in \Lambda\}$ span $L^p(\mathbb{R})$. We prove that exponentially small non-zero pertubations of the integers are p-spectral for all $p>1$.
Olevskij, Aleksandr M. +1 more
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A set $\Lambda$ is called $p$-spectral if there is a function $g \in L^p (\mathbb{R})$ such that all $\Lambda$-translates $\{g(t-\lambda),\lambda \in \Lambda\}$ span $L^p(\mathbb{R})$. We prove that exponentially small non-zero pertubations of the integers are p-spectral for all $p>1$.
Olevskij, Aleksandr M. +1 more
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Translating discrete-time simulink to lustre
ACM Transactions on Embedded Computing Systems, 2005We present a method of translating discrete-time Simulink models to Lustre programs. Our method consists of three steps: type inference, clock inference, and hierarchical bottom-up translation. In the process, we explain and formalize the typing and timing mechanisms of Simulink. The method has been implemented in a prototype tool called S2L, which has
Stavros Tripakis +3 more
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Random translation of discrete order statistics
Statistics, 2013We investigate the existence and uniqueness of a discrete parent distribution supported on the integers whose order statistics are related by a random translation. We also provide some examples using the constructive method that we propose.
Fernando López Blázquez +2 more
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Translation invariant complex discrete wavelet transforms
2008 International Conference on Wavelet Analysis and Pattern Recognition, 2008The CDWT was first proposed by Kingsbury as a tool for motion estimation in 1998. It was effective at solving the problem of poor translation invariance in the traditional DWT and has been applied in various fields. Thus, its practical use occurred early on, and its rationality was not theoretically interpreted.
Zhong Zhang, Hiroshi Toda
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Uniform discreteness and Heisenberg translations
Mathematische Zeitschrift, 1997Let \(G\) be a discrete subgroup of \({\mathbf P} {\mathbf U} (n,1)\) containing a Heisenberg translation \(g\). The purpose of this paper is to show that any element of \(G\) not sharing a fixed point with \(g\) has an isometric sphere whose radius is bounded above by a function of the translation length of \(g\) at its centre.
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PERFECT-TRANSLATION-INVARIANT CUSTOMIZABLE COMPLEX DISCRETE WAVELET TRANSFORM
International Journal of Wavelets, Multiresolution and Information Processing, 2013The theorems, giving the condition of perfect translation invariance for discrete wavelet transforms, have already been proven. Based on these theorems, the dual-tree complex discrete wavelet transform, the 2-dimensional discrete wavelet transform, the complex wavelet packet transform, the variable-density complex discrete wavelet transform and the ...
Toda, Hiroshi +2 more
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Translation invariant transformations of discrete random sets
Proceedings SIBGRAPI'98. International Symposium on Computer Graphics, Image Processing, and Vision (Cat. No.98EX237), 2002Random modeling is an important technique for solving hard problems in coding, quantitative description and restoration of images. In the sixties. Matheron introduced the theory of Random Closed Sets (RACS), that permits the creation of models by morphological transformations of primitive processes.
J. Barrera, M. Brun
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Translations of the Discrete Bose-Einstein Operators
Journal of Mathematical Physics, 1966The effects on a certain family of representations of the commutation relations of the operator-translations ak → ak + ck, ak* → ak* + ck*, are investigated. Here ak and ak* are the annihilation and creation operators of the representations, the ck are complex numbers (scalar operators), and the representations considered are the discrete ...
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