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1
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Przegląd Elektrotechniczny
2000 nr 9 224-229
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Machine Graphics and Vision
EN An important application domain of the wavelet theory is compression. In this paper, we use wavelet transforms to compress two different types of images (i) medical images (Echo image), (ii) color images, by using two different procedures. We use different types of wavelet transforms. Further, the c[...]
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Journal of Theoretical and Applied Mechanics
2011 Vol. 49 nr 2 399-417
PL Niniejsza praca poświęcona jest technice diagnostyki konstrukcji bazującej na transformacie falkowej. Badany obiekt to belka wspornikowa z uszkodzeniami w firmie nacięcia o głębokości 20%, 10% oraz 5% wysokości belki. Pomiary postaci drgań wykonano za pomocą nowoczesnego wibrometru laserowego. Celem[...]
EN Technical difficulties prevented so far wider applications of higher mode shapes in damage detection. Yet these modes carry on a lot of, so much needed, information on damage inflicted to a structure. However, recent scanning laser-based vibration measurement techniques allow one to utilize these hi[...]
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Metrology and Measurement Systems
EN Wavelet transform becomes a more and more common method of processing 3D signals. It is widely used to analyze data in various branches of science and technology (medicine, seismology, engineering, etc.). In the field of mechanical engineering wavelet transform is usually used to investigate surface[...]
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Pomiary Automatyka Kontrola
PL W artykule omówiono podstawowe zasady rozpoznawania rytmu zatoko-wego w sygnale EKG. Zaprezentowano przykłady zastosowania transformaty falkowej (ang. wavelet transform, WT) do wyznaczania lokalizacji czasowej załamków P i R. Parametry wspomnianych załamków oraz relacje czasowe zachodzące miedzy nim[...]
EN In this article, basic principles applied to recognition of the sinus rhythm in ECG signal are described. Examples of using the wavelet transform for determination of P and R waves localization are presented. Parameters of the mentioned waves and time relations between them are using for automatic o[...]
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Pomiary Automatyka Robotyka
PL Artykuł przedstawia podstawy teoretyczne ciągłej i dyskretnej transformaty falkowej oraz możliwości praktycznego zastosowania jej w analizie zdarzeń (takich jak np. wykrywanie skoków wartości średniej) w zaszumionych szeregach czasowych. Omawiane algorytmy mogłyby znaleźć zastosowanie w diagnostyce [...]
EN The paper presents theoretical background of continuous and discrete wavelet transform and its practical application in time series event detection (such as e.g. rapid change of mean value). This approach is useful even in very noisy data. Presented algorithms could be applied in supervision of proc[...]
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Zeszyty Naukowe. Elektryka / Politechnika Opolska
EN The paper presents novel approach in distribution protection technic of fault line selection based on analysis of generated transient. Advantages of discrete wavelet transform for signal analysis are discused. The potential of using discrete wavelet transform in protective relay is examined and mode[...]
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Przegląd Elektrotechniczny
2008 R. 84, nr 12 202-204
PL W artykule zostało przedstawione nowe podejście do przewidywania temperatury oleju w transformatorze. W podejściu tym zostały użyte neuronowe sieci falkowe w celu przewidzenia temperatury oleju z wyprzedzeniem 32 minut. W artykule przedstawiono sposób wyboru optymalnych parametrów dla sieci neuronow[...]
EN In this paper a new approach for predicting oil temperature for substation distribution transformer is presented. It takes advantage of a wavelet neural network (WNN), which is used to predict the oil temperature in the following 32 minutes. The in this article we choose optimal parameters for WNN a[...]
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Acta Geophysica Polonica
EN In recent years, a great progress has been made in improving our understanding of irregular behaviour of physical processes. A fundamental result of this study is that even a simple, deterministic, but nonlinear and dissipative system can exhibit irregular, random-like behaviour. Before applying sop[...]
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Fundamenta Informaticae
EN The wavelet compression method is one of the most effective techniques of digital image compression. Effeciency of this method strongly depends on the filters used in two-dimensional wavelet transform. The fundamental way of construction of finite impulse response filters was given by I. Daubechies.[...]
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Zeszyty Naukowe Politechniki Białostockiej. Budowa i Eksploatacja Maszyn
2001 Z. 8 199-212
PL Każdy sygnał pomiarowy jest zakłócany sygnałami losowymi (szumami). Nie można ich jednak zidentyfikować prowadząc jedynie analizę w dziedzinie częstotliwości Przedstawiona transformata falkowa umożliwia badania zarówno w dziedzinie częstotliwości, jak i czasu. Została ona wykorzystana do analizy prz[...]
EN Each measured signals are depended on stochastic factors. Now, effectiveness of filtering process can't be done by analysis frequency domain. Due to wavelet transform can be done signal analysis in frequency and time domain. In this paper courses of biomechanical signals were used. Wavelet signal tr[...]
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Archives of Acoustics
2014 Vol. 39, No. 3 385--394
EN It is assumed in the paper that the signals in the enclosure in a transient period are similar to a noise induced by vehicles, tracks, cars, etc. passing by. The components of such signals usually points out specific dynamic processes running during the observation or measurements. In order to choos[...]
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Machine Graphics and Vision
EN An important application domain of the wavelet theory is denoising. In this paper, we use the wavelet transforms to denoise the medical images. There are many kinds of noise and we study only three types; i) additive random noise; ii) pop noise and; iii) localized random noise. Further, we use Root [...]
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Machine Graphics and Vision
EN Proliferative diabetic retinopathy is a complication of diabetes that can eventually lead to blindness. Early identification of this complication reduces the risk of blindness so that timely treatment can be initiated. In rural and remote regions, widespread population screening is practically impos[...]
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Polish Maritime Research
2015 S 1 149--156
EN The travel time tomography technology had achieved wide application, the hinge of tomography was inversion algorithm, the ray path tracing technology had a great impact on the inversion results. In order to improve the SNR of inversion image, comprehensive utilization of inversion results with diffe[...]
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Archives of Acoustics
EN In this paper, a new feature-extraction method is proposed to achieve robustness of speech recognition systems. This method combines the benefits of phase autocorrelation (PAC) with bark wavelet transform. PAC uses the angle to measure correlation instead of the traditional autocorrelation measure, [...]
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Biuletyn Instytutu Automatyki i Robotyki
EN This paper presents a method of progressive digital transmission of a video stream, based on picture frame multi-resolution analysis.
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International Journal of Electronics and Telecommunications
EN A novel method for calculation of the entropy measure in wavelet space is proposed. This perceived-based entropy measure uses a Second Order Model entropy estimator, in which the occurrence of neighbors is considered in formulation. It has the intention to allow the implementation of a more suitable[...]
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Poznan University of Technology Academic Journals. Electrical Engineering
2016 No. 85 187--195
EN The article constitutes a set of research referring to the removal of the noise of Gaussian distribution of signal using wavelet analysis. The thesis has been launched of presentation of existing analysis algorithms, starting of discrete transform related to Mallat’s algorithm, and ending with the s[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2004 Vol. 8, No 2 269-280
EN The paper describes an EMG signal analysis based on the wavelet transform, applied for the hand prosthesis control. Signal features are represented by wavelet coefficients. A cross-validation method is applied for the feature selection process. The classification algorithm uses multistage recognitio[...]
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