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Reprezentari rare în prelucarea semnalelor

Proiect IDEI 2011, cod PN-II-ID-PCE-2011-3-0400

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Echipa

Documente

Articole in reviste

Articole la conferinte

Software

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Reprezentarile rare au fost intens studiate in ultimii ani datorita capacitatii lor de a explica mai bine fenomene fizice sau relatii intre date experimentale. Un model rar are doar putini parametri nenuli, dar este dificil a decide care anume. Scopul acestui proiect este de a propune algoritmi pentru mai multe probleme din prelucrarea semnalelor:
  • Proiectarea filtrelor rare, cu extensie la bancurile de filtre si la cazul 2D.
  • Problema rara totala a celor mai mici patrate: proprietati, algoritmi lacomi, relatia cu problema celor mai mici patrate.
  • Proiectarea dictionarelor pentru reprezentari rare, cu aplicatii in prelucrarea semnalelor audio si a imaginilor.
Algoritmii, impreuna cu demonstratii teoretice si practice a validitatii si eficientei, vor fi miezul unor publicatii in reviste si conferinte de calitate.

Aceasta activitate este finantata de Autoritatea Nationala pentru Cercetare Stiintifica, CNCS UEFISCDI, prin proiectul PN-II-ID-PCE-2011-3-0400, contract nr. 169/2011.

Echipa
  • prof. Bogdan Dumitrescu
  • dr. Bogdan Sicleru
  • dr. Cristian Rusu
  • drd. Paul Irofti (2013-)
Documente
Articole in reviste
Articole la conferinte
  • B.Dumitrescu, P.Irofti, "Low Dimensional Subspace Finding via Size-Reducing Dictionary Learning", IEEE Int. Workshop Machine Learning for Signal Processing, Salerno, Italy, Sep. 2016. Fisiere pdf: versiune finala autori
  • S.Maanan, B.Dumitrescu, C.D.Giurcaneanu, "Renormalized Maximum Likelihood for Multivariate Autoregressive Models", European Signal Processing Conference (EUSIPCO), Budapest, Hungary, pp. 150–154, Sep. 2016. Fisiere pdf: versiune finala autori
  • P.Irofti, B.Dumitrescu, "Overcomplete Dictionary Learning with Jacobi Atom Updates", Int. Conf. Telecommunications and Signal Processing, Vienna, Austria, June 2016. Fisiere pdf: versiune finala autori
  • P.Irofti, B.Dumitrescu, "Regularized Algorithms for Dictionary Learning", Int. Conf. Communications, Bucharest, Romania, pp.439–442, June 2016. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • P.Irofti, B.Dumitrescu, "Overcomplete Dictionary Design: the Impact of the Sparse Representation Algorithm", 20th Int. Conf. on Control Systems and Computer Science, Bucharest, Romania, pp.901-908, 2015. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • P.Irofti, "Sparse Denoising with Learned Composite Structured Dictionaries", 19th. Int. Conf. System Theory, Control and Computers, Cheile Gradistei, Romania, pp.331-336, 2015. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • P.Irofti, B.Dumitrescu, "Cosparse Dictionary Learning for the Orthogonal Case", 19th. Int. Conf. System Theory, Control and Computers, Cheile Gradistei, Romania, pp.343-347, 2015. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • A.Onose, B.Dumitrescu, "Adaptive Cyclic and Randomized Coordinate Descent for the Sparse Total Least Squares Problem", European Signal Processing Conference (EUSIPCO), Nice, France, pp.1696-1700, 2015. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • B.Dumitrescu, C.Rusu, I.Tabus, J.Astola, "Low-complexity robust DOA estimation", Int. Conf. Acoustics Speech Signal Proc. (ICASSP), Brisbane, Australia, pp.2794-2798, 2015. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • P.Irofti, B.Dumitrescu, "GPU Parallel Implementation of the Approximate K-SVD Algorithm Using OpenCL", European Signal Processing Conference (EUSIPCO), Lisbon, Portugal, pp.271-275, 2014. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • B.C.Sicleru, B.Dumitrescu, "Optimization with Sums of Exponentials and Applications", Int. Conf. Acoustics Speech Signal Proc. (ICASSP), Florence, Italy, pp.370-374, 2014. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • C.Rusu, B.Dumitrescu, "An Initialization Strategy for the Dictionary Learning Problem", Int. Conf. Acoustics Speech Signal Proc. (ICASSP), Florence, Italy, pp.6731-6735, 2014. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • B.C.Sicleru, B.Dumitrescu, "Greedy Sparse Spectral Factorization Using Reduced-Size Gram Matrix Parameterization", European Signal Processing Conference (EUSIPCO), Marrakesh, Marocco, 2013. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • C.Rusu, B.Dumitrescu, "Block Orthonormal Overcomplete Dictionary Learning", European Signal Processing Conference (EUSIPCO), Marrakesh, Marocco, 2013. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • C. Rusu, "Fast design of efficient dictionaries for sparse representations", IEEE Int. Workshop Mach. Learning Signal Proc., Santander, Spain, Sept. 2012. Fisiere pdf: versiune ieeexplore
  • B.C.Sicleru, B.Dumitrescu, "Least-Squares Design of 2-D Sparse Nonseparable Filter Banks Using Transformation of Variables: A Greedy Approach", European Signal Processing Conference (EUSIPCO), Bucharest, Romania, pp.76-80, Aug. 2012. Fisiere pdf: versiune finala autori, versiune ieeexplore
  • C. Rusu, "Clustering Before Training Large Datasets - Case Study: K-SVD", European Signal Processing Conference (EUSIPCO), Bucharest, Romania, pp.2188-2192, Aug. 2012. Fisiere pdf: versiune finala autori, versiune ieeexplore
Software
  • Biblioteca POS3POLY pentru optimizare cu polinoame pozitive.