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  • Pozycja
    Image filtering with past parametrized biorthogonal transforms implemented on a new GUI research aid system
    (Wydawnictwo Politechniki Łódzkiej, 2013) Puchała, Dariusz; Stasiak, Bartłomiej; Stokfiszewski, Kamil; Yatsymirskyy, Mykhaylo
    In this paper the authors show that fast parametrized biorthogonal transforms (FPBT) are well suited for adaptive generalized Wiener image filtering. Research results are obtained with a use of a new graphical user interface system for implementing various fast adaptive techniques, designed, implemented and published by the authors as a part of a project Innovative Economy Programme 2007-2013 „Platforma Informatyczna TEWI”.
  • Pozycja
    Multipitch estimation using judge-based model
    (Division IV: Engineering Sciences of the Polish Academy of Sciences, 2014) Rychlicki-Kicior, Krzysztof; Stasiak, Bartłomiej
    Multipitch estimation, also known as multiple fundamental frequency (F0) estimation, is an important part of the Music Information Retrieval (MIR) field. Although there have been many different approaches proposed, none of them has ever exceeded the abilities of a trained musician. In this work, an iterative cancellation method is analysed, being applied to three different sound representations - salience spectrum obtained using Constant-Q Transform, cepstrum and enhanced autocorrelation result. Real-life recordings of different musical instruments are used as a database and the parameters of the solution are optimized using a simple yet effective metaheuristic approach - the Luus-Jaakola algorithm. The presented approach results in 85% efficiency on the test database.