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Improving digital watermarking fidelity using fast neural network for adaptive wavelet synthesis
(Wydawnictwo Politechniki Łódzkiej, 2010) Stolarek, Jan; Lipiński, Piotr
This paper introduces a new adaptive algorithm for digital watermark embedding in wavelet domain. The proposed algorithm performs adaptive mother wavelet synthesis based on a low frequency component energy maximization. The algorithm is based on an orthogonal neural network. We demonstrate that the presented adaptive method can improve both the correlation between an extracted watermark and an embedded watermark, as well as the fidelity of an image. The proposed algorithm is applied to improve well known wavelet based embedding algorithms.
On properties of a lattice structure for a Wavelet Filter Bank Implementation
(Wydawnictwo Politechniki Łódzkiej, 2011) Stolarek, Jan
This paper presents concept of a lattice structure for parametrization and implementation of a Discrete Wavelet Transform. Theoretical properties of the lattice structure are discussed in detail. An algorithm for converting the lattice structure to a wavelet filter bank coeffcients is constructed. A theoretical proof demonstrating that filters implemented by the lattice structure fulfil conditions imposed on an orthogonal wavelet filter bank is conducted.
On properties of a lattice structure for a wavelet filter bank implementation. Pt. 2
(Wydawnictwo Politechniki Łódzkiej, 2011) Stolarek, Jan
This paper continues discussion of a lattice structure for parametrization and implementation of a Discrete Wavelet Transform. Based on an algorithm for converting the lattice structure to a wavelet filter bank coefficients, developed in the first part of this paper, second part of the proof demonstrating that filters implemented by the lattice structure fulfil conditions imposed on an orthogonal wavelet filter bank is carried out.
The Use of Heuristic Algorithms: A Case Study of a Card Game
(Wydawnictwo Politechniki Łódzkiej, 2018) Lichy, Krzysztof; Mazur, Marcin; Stolarek, Jan; Lipiński, Piotr
In this paper we introduce the results of an experiment consisting in the creation of artiﬁcial intelligence using the heuristic algorithm Monte Carlo Tree Search and evaluation of its effectiveness in the card game Thousand.
Virtual Money for Purchases in School Shops and for Educational Applications: eZloty
(Wydawnictwo Politechniki Łódzkiej, 2018) Pawlak, Michał; Guziur, Jakub; Poniszewska-Marańda, Aneta; Stolarek, Jan
Recent developments in Polish legislation concerning the healthiness of products in schools shops and results of law compliance veriﬁcation resulted in a need for a way to supervise purchases in school shops. In this article, a solution for this problem is presented in a form of an online payment platform utilizing virtual currency called eZloty. The platform is based on blockchain technology which allows storing transaction history in an immutable form. As a result, eZloty payment system would enable supervision of products bought in schools, thus creating a possibility for more directed actions promoting healthy food and compliance with ministry regulations.