Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Lars F. Villemoes"'
Publikováno v:
INTERSPEECH
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::504a6412bcb57e07c24b67fd36ffc2b2
https://doi.org/10.21437/interspeech.2018-2096
https://doi.org/10.21437/interspeech.2018-2096
Autor:
Lars F. Villemoes
Publikováno v:
Comptes Rendus Mathematique. 335:793-796
We construct basic wavelet packets with uniformly bounded localization in both time and frequency. The corresponding orthonormal bases of wavelet packets are parametrized by dyadic segmentations obeying a local variation condition. To cite this artic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::678ad7721018fe48c10da9fb972bf4fa
https://doi.org/10.1016/s1631-073x(02)02570-0
https://doi.org/10.1016/s1631-073x(02)02570-0
Publikováno v:
Scopus-Elsevier
This contribution deals with the problem of structure determination for generalized orthonormal basis models used in system identification. The model structure is parameterized by a prespecified set of poles representing a finite-dimensional subspace
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f67a20c53e0c2a00d7a5c5c2a12702d9
https://doi.org/10.1137/s036301299732818x
https://doi.org/10.1137/s036301299732818x
Autor:
Lars F. Villemoes, Christoph Thiele
Publikováno v:
Applied and Computational Harmonic Analysis. 3(2):91-99
We first consider orthonormal bases of open face RNconsisting of discretized rescaled Walsh functions, whereNis a power of two. Given a vector, the best basis with respect to an additive cost function is found with an algorithm of orderO(NlogN). The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ca62b1b95aba3f90b07375def08f8e3
Autor:
Lars F. Villemoes
Publikováno v:
SIAM Journal on Mathematical Analysis. 25:1433-1460
The Besov regularity of a compactly supported refinement equation solution is determined by the spectral radius of a linear operator acting on $\ell ^p (\mathbb{Z})$. The proof of this is obtained by using a wavelet basis. Exact criteria for Holder a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc97af892856333bf5d3e5d24a52ab94
https://doi.org/10.1137/s0036141092228179
https://doi.org/10.1137/s0036141092228179
Autor:
Lars F. Villemoes
Publikováno v:
Applied and Computational Harmonic Analysis. 1:180-187
We characterize the continuous compactly supported solutions to the bidimensional refinement equation where the dilation matrix corresponds to a multiplication by √2 followed by a rotation of π/4. The exact Hölder exponent is found in terms of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a331d74f399a0cb50f8ef835bb5bc0bd
https://doi.org/10.1006/acha.1994.1005
https://doi.org/10.1006/acha.1994.1005
Autor:
Lars F. Villemoes
Publikováno v:
SIAM Journal on Mathematical Analysis. 23:1519-1543
This paper indicates how to find energy moments in direct and Fourier space of a solution to the functional equation $u(x) = \sum_{k = 0}^{N - 1} {2c_k u(2x - k)} $ and shows that the Sobolev regularity of u is determined by the spectral radius of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ebdc6cb7eeb9a304c3966fd7bb8412d
https://doi.org/10.1137/0523085
https://doi.org/10.1137/0523085
Autor:
Lars F. Villemoes, M. Lindberg
Publikováno v:
Wavelet Applications in Signal and Image Processing VIII.
We perform adaptive joint space and frequency tilings including all levels in the Haar-Walsh wavelet packet tree for 2D signals. The method gives surprisingly good results in terms of nonlinear approximation. The visual quality of the compressed imag
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f92b642fdb35ce20b26757da19d3527
https://doi.org/10.1117/12.408575
https://doi.org/10.1117/12.408575
Autor:
Lars F. Villemoes
Publikováno v:
Applied and Computational Harmonic Analysis. (2):139-162
We develop and analyze a best basis algorithm for orthonormal bases of local cosines which satisfy a uniform bound on their time-frequency concentration. All waveforms are obtained from three elementary window functions by shifts, rescaling, and modu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba8968dc233fe115b5f97cd2a2fb39e4
Conference
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.