Log in

Relevant bibliographies by topics / Wiener filter / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Wiener filter.

Dissertations / Theses on the topic 'Wiener filter'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Wiener filter.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Hiemstra, John David. "Robust Implementations of the Multistage Wiener Filter." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26714.

Full text

Abstract:

The research in this dissertation addresses reduced rank adaptive signal processing, with specific emphasis on the multistage Wiener filter (MWF). The MWF is a generalization of the classical Wiener filter that performs a stage-by-stage decomposition based on orthogonal projections. Truncation of this decomposition produces a reduced rank filter with many benefits, for example, improved performance. This dissertation extends knowledge of the MWF in four areas. The first area is rank and sample support compression. This dissertation examines, under a wide variety of conditions, the size of the

APA, Harvard, Vancouver, ISO, and other styles

2

Kayrish, Matthew Greco. "Robust GM Wiener Filter in the Complex Domain." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19230.

Full text

Abstract:

Space-Time Adaptive Processing is a signal processing technique that uses an adaptive array to help remove nonhomogeneous data points from a dataset. Since the early 1970s, STAP has been used in radar systems for their ability to "filter clutter, interference and jamming signals. One major flaw with early STAP radar systems is the reliance on non-robust estimators to estimate the noise condition. When even a single outlier is present, the earliest STAP radar systems would break down, causing the target to be missed. Many algorithms have been developed to successfully estimate the noise conditi

APA, Harvard, Vancouver, ISO, and other styles

3

Tan, Sovira. "A pattern recognition Wiener filter for realistic clutter backgrounds." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390826.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Burada, Ranga. "Joint Resampling and Restoration of Hexagonally Sampled Images Using Adaptive Wiener Filter." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450415906.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kim, Sang-Myeong. "Active control of sound in structural-acoustic coupled systems." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245303.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Mohamed, Khaled Mohamed Ahmied. "A Collaborative Adaptive Wiener Filter for Image Restoration and Multi-frame Super-resolution." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1426536832.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

SMITH, WARREN ESCHHOLZ. "SIMULATED ANNEALING AND ESTIMATION THEORY IN CODED-APERTURE IMAGING (RECONSTRUCTION, MONTE CARLO, WIENER FILTER)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188135.

Full text

Abstract:

Coded-aperture imaging without detector motion can be used to reconstruct three-dimensional radionuclide distributions in the context of nuclear medicine. This approach offers several advantages over the rotating gamma-ray camera systems presently employed in the clinic. These advantages include improved sensitivity, potentially better spatial resolution, and the capability of doing dynamic studies. There are two problems associated with the coded-aperture approach, however. First, the data is "multiplexed", which refers to the fact that many line integrals of the source distribution are combi

APA, Harvard, Vancouver, ISO, and other styles

8

Rucci, Michael. "Computationally Efficient Video Restoration for Nyquist Sampled Imaging Sensors Combining an Affine-Motion Based Temporal Kalman Filter and Adaptive Wiener Filter." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398286798.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Nakashima, Giovana Yuko. "Aplicação do filtro de WIENER para tratamento de sinais eletromiográficos." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-11122003-151819/.

Full text

Abstract:

A eletromiografia consiste no estudo do movimentos dos músculos através dos sinais elétricos emitidos pelos mesmos. Esses sinais são captados por meio de eletrodos (de surpefície ou de agulha), sendo muito suscetíveis a variações e interferências não relacionadas diretamente com o movimento muscular (ruídos). Visando obter dados qualitativamente confiáveis, o processamento digital de sinais fornece como ferramentas os filtros ótimos e adaptativos, que são utilizados quando o sinal desajado está contaminado por ruído. Com a finalidade de diminuir o ruído presente no sinal eletromiográfico, fora

APA, Harvard, Vancouver, ISO, and other styles

10

Zhou, Zheng N. "Space-time adaptive processing with multi-staged Wiener filter and principal component signal dependent algorithms." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/276.

Full text

Abstract:

Space-time Adaptive Processing (STAP) is a two-dimensional filtering technique for antenna array with multiple spatial channels. The name "space-time" describes the coupling of these spatial channels with pulse-Doppler waveforms. Applications for STAP includes ground moving target indicator (GMTI) for airborne radar systems. Today, there are strong interests to develop STAP algorithms for operations in “sample starved” environments, where intense environmental interference can reduce STAP capacity to detect and track ground targets. Careful applications of STAP can effectively overcome thes

APA, Harvard, Vancouver, ISO, and other styles

11

Jeanvoine, Arnaud. "Intérêt des algorithmes de réduction de bruit dans l’implant cochléaire : Application à la binauralité." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10338/document.

Full text

Abstract:

Les implants cochléaires sont des appareils destinés à la réhabilitationdes surdités profondes et totales. Ils assurent la stimulation du nerf auditif en plaçant des électrodes dans la cochlée. Différentes études ont été établis afin d’améliorer l’intelligibilité de la parole dans le bruit chez le patientporteur de cet appareil. Les techniques bilatérales et binaurales permettent dereproduire une audition binaurale, car les deux oreilles sont simulées (commepour les personnes normo-entendantes). Ainsi la localisation et la perceptiondes sons environnants sont améliorées par rapport à une impla

APA, Harvard, Vancouver, ISO, and other styles

12

Wiltgen, Timothy Edward. "Adaptive Beamforming using ICA for Target Identification in Noisy Environments." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33118.

Full text

Abstract:

The blind source separation problem has received a great deal of attention in previous years. The aim of this problem is to estimate a set of original source signals from a set of linearly mixed signals through any number of signal processing techniques. While many methods exist that attempt to solve the blind source separation problem, a new technique is being used that uniquely separates audio sources as they are received from a microphone array. In this thesis a new algorithm is proposed that that utilizes the ICA algorithm in conjunction with a filtering technique that separates source

APA, Harvard, Vancouver, ISO, and other styles

13

Jalůvková, Lenka. "Eliminace zkreslení obrazů duhovky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220862.

Full text

Abstract:

This master`s thesis is focused on a suppression of a distorsion in iris images. The aim of this work is to study and describe existing degradation methods (1D motion blur, uniform 2D motion blur, Gaussian blur, atmospheric turbulence blur, and out of focus blur). Furthermore, these methods are implemented and tested on a set of images. Then, we designed methods for suppression of these distorsions - inverse filtration, Wiener filtration and iterative deconvolution. All of these methods were tested and evaluated. Based on the experimental results, we can conclude that the Wiener-filter restora

APA, Harvard, Vancouver, ISO, and other styles

14

Vieira, Marcelo Andrade da Costa. "Metodologia baseada nas funções de transferência para pré-processamento de imagens mamográficas digitais e sua aplicação em esquema computacional de auxílio ao diagnóstico." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-19112007-144354/.

Full text

Abstract:

Este trabalho tem por objetivo a investigação do comportamento de equipamentos de radiodiagnóstico em termos da qualidade da imagem produzida e a subseqüente aplicação desses resultados na otimização do desempenho de esquemas computacionais de auxílio ao diagnóstico, também conhecidos como esquemas CAD (do inglês, Computer-Aided Diagnosis). A principal meta consiste no desenvolvimento de técnicas de pré-processamento para imagens mamográficas digitalizadas que as realçasse de acordo com as características e limitações dos equipamentos utilizados na sua aquisição. A proposta está dividida em du

APA, Harvard, Vancouver, ISO, and other styles

15

Cohen, Zachary Gideon. "Noise Reduction with Microphone Arrays for Speaker Identification." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/884.

Full text

Abstract:

The presence of acoustic noise in audio recordings is an ongoing issue that plagues many applications. This ambient background noise is difficult to reduce due to its unpredictable nature. Many single channel noise reduction techniques exist but are limited in that they may distort the desired speech signal due to overlapping spectral content of the speech and noise. It is therefore of interest to investigate the use of multichannel noise reduction algorithms to further attenuate noise while attempting to preserve the speech signal of interest. Specifically, this thesis looks to investigate th

APA, Harvard, Vancouver, ISO, and other styles

16

Smital, Lukáš. "Vlnková filtrace elektrokardiogramů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233607.

Full text

Abstract:

This dissertation deals with possibilities of using wavelet transforms for elimination of broadband muscle noise in ECG signals. In this work, the characteristics of ECG signals and particularly the most frequently occurring type of interference are discussed firstly. The theory of wavelet transforms is also introduced and followed by design of the simple wavelet filter and the more sophisticated version with wiener filtering of wavelet coefficients. Next part is devoted to the design of our filter, which is based on wavelet wiener filtering and is complemented by algorithms that ensure full a

APA, Harvard, Vancouver, ISO, and other styles

17

Čišecký, Roman. "Metody pro odstranění šumu z digitálních obrazů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219769.

Full text

Abstract:

The master's thesis is concerned with digital image denoising methods. The theoretical part explains some elementary terms related to image processing, image noise, categorization of noise and quality determining criteria of denoising process. There are also particular denoising methods described, mentioning their advantages and disadvantages in this paper. The practical part deals with an implementation of the selected denoising methods in a Java, in the environment of application RapidMiner. In conclusion, the results obtained by different methods are compared.

APA, Harvard, Vancouver, ISO, and other styles

18

Sud, Seema. "Reduced Rank Adaptive Filtering Applied to Interference Mitigation in Wideband CDMA Systems." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27158.

Full text

Abstract:

The research presented in this dissertation is on the development and application of advanced reduced rank adaptive signal processing techniques for high data rate wireless code division multiple access (CDMA) communications systems. This is an important area of research in the field of wireless communications. Current systems are moving towards the use of multiple simultaneous users in a given channel to increase system capacity as well as spatial and/or temporal diversity for improved performance in the presence of multipath and fading channels. Furthermore, to accommodate the demand for hig

APA, Harvard, Vancouver, ISO, and other styles

19

Nguyen, Hien. "Robust Steering Vector Mismatch Techniques for Reduced Rank Adaptive Array Signal Processing." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29238.

Full text

Abstract:

The research presented in this dissertation is on the development of advanced reduced rank adaptive signal processing for airborne radar space-time adaptive processing (STAP) and steering vector mismatch robustness. This is an important area of research in the field of airborne radar signal processing since practical STAP algorithms should be robust against various kinds of mismatch errors. The clutter return in an airborne radar has widely spread Doppler frequencies; therefore STAP, a two-dimensional adaptive filtering algorithm is required for effective clutter and jamming cancellation. Rea

APA, Harvard, Vancouver, ISO, and other styles

20

Namroud, Iman. "An Analysis of Aliasing and Image Restoration Performance for Digital Imaging Systems." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1399046084.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Janů, Joshua. "Vlnkový wienerovský filtr EKG signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220872.

Full text

Abstract:

The thesis focuses on the use of wavelet wiener filtration to remove muscular interference from ECG signals. As part of it, a filter has been implemented in the MATLAB programming environment. The main part of the thesis deals with the optimization of numerical parameters of the proposed filter. The results of the filtration are compared with the results reported by other authors.

APA, Harvard, Vancouver, ISO, and other styles

22

Zobačová, Barbora. "Segmentace signálů EKG na základě jejich kvality." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377765.

Full text

Abstract:

This semestral thesis deals with methods for continuous estimation of the quality of the ECG signal. The theoretical part includes the functional anatomy of the heart, the basics of electrocardiography, the types of noise that can be found in the ECG records, and a description of several methods for the continuous estimation of the ECG signal quality. Next here are some approaches to segmenting ECG signals based on their quality. The practical part deals with the implementation of two methods. The first method is the SNR estimation method based on the Wiener filter. The second method is the me

APA, Harvard, Vancouver, ISO, and other styles

23

Moldříková, Zuzana. "Metody potlačení šumu pro rozpoznávače řeči." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220874.

Full text

Abstract:

This diploma thesis deals with methods of noise suppression for speech recognition systems. In theoretical part are discussed basic terms of this topic and also methods for noise suppression. These are spectral subtraction, Wiener filtering, RASTA, mapping of spectrogram or algorithms based on noise estimation. In second part types of noise are analyzed, there is proposal and implementation of spectral subtraction method of noise suppression for speech recognition system. Also extensive testing of spectral subtractive algorithms in comparison with Wiener filter is conducted. Assessment of this

APA, Harvard, Vancouver, ISO, and other styles

24

Riad, Rabia. "Tatouage robuste d’images imprimées." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2068/document.

Full text

Abstract:

Le tatouage invisible d’images d’identité imprimées sur un support en plastique est un problème difficile qui intéresse le monde industriel. Dans cette étude, nous avons développé un algorithme de tatouage robuste aux diverses attaques présentes dans ce cas. Ces attaques sont liées aux processus d’impression/numérisation sur le support plastique ainsi qu’aux dégradations qu’une carte plastique peut rencontrer le long de sa durée de vie. La méthode de tatouage opère dans le domaine de Fourier car cette transformée présente des propriétés d’invariances aux attaques géométriques globales. Une mét

APA, Harvard, Vancouver, ISO, and other styles

25

Охман, Юрій Олександрович, та Yuriy Ohman. "Метод фільтрації адитивної суміші аналогових сигналів та шуму". Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2020. http://elartu.tntu.edu.ua/handle/lib/33287.

Full text

Abstract:

Кваліфікаційну роботу магістра присвячено розробленню методу адаптивної фільтрації суміші сигналу та шуму. Проаналізовано способи реалізації аналогових фільтрів та встановлено неможливість реалізації на їх основі адаптивних фільтрів. Проаналізовано методи вінерівської фільтрації та адаптивної фільтрації. Як варіант розглянуто метод спектрального віднімання, який при наступному моделюванні показав відмінні результати фільтрації<br>The master's thesis is devoted to the development of a method of adaptive filtering of a mixture of signal and noise. The methods of realization of analog filters are

APA, Harvard, Vancouver, ISO, and other styles

26

Romualdo, Larissa Cristina dos Santos. "Restauração de imagens mamográficas digitais utilizando o filtro de Wiener no domínio de Anscombe e o filtro inverso da MTF no domínio da frequência." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-17112009-084935/.

Full text

Abstract:

Este trabalho tem por objetivo o desenvolvimento de uma nova técnica de pré-processamento de imagens mamográficas digitais para melhorar o desempenho dos esquemas computacionais de auxílio ao diagnóstico (CAD) e para auxiliar na detecção precoce do câncer de mama. O método proposto efetua uma restauração nas imagens mamográficas utilizando, em uma primeira etapa, a transformada de Anscombe e o filtro de Wiener para redução do ruído quântico. Posteriormente, é utilizado o filtro inverso da função de transferência de modulação (MTF) do sistema de imagem para realce das estruturas de interesse na

APA, Harvard, Vancouver, ISO, and other styles

27

Handl, Marek. "Vlnková filtrace signálů EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220046.

Full text

Abstract:

The work deals with the wavelet transformation, focusing on wavelet transforms with discrete time (DTWT). The practical part is focused on the implementation of redundant packet DTWT and its use in the filtration of ECG signals. The main part of the work is to design wiener filter that uses redundant packet DTWT, designed to eliminate interference myopotentials of ECG signals. The actual solution is implemented in Matlab. Testing is performed on the library CSE using noise model myopotentials used to noising original signals. For optimum parameters designed filter is used the genetic algorithm

APA, Harvard, Vancouver, ISO, and other styles

28

Sizov, Vasily. "Wienerovská vlnková filtrace signálů EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-374614.

Full text

Abstract:

Tato práce se zabývá možností využití vlnkové transformace v aplikacích, které se zabývají potlačením šumu. Především se jedná o oblast filtrace signálu EKG. Úkolem je zhodnotit vliv různých parametrů nastavení samotné filtrace a zjistit jaký vliv má různé nastavení prahování wavelet koeficientů. Výsledkem práce je také stanovení hodnot prahů, stanovení nejlepšího způsobu rozkladu signálu a volba rekonstrukčních bank filtrů. Text obsahuje výsledky Wienerovy filtrace, při které byly testovány různé banky rozkladových a rekonstrukčních filtrů.Všechny popsané filtrační metody byly testovány na re

APA, Harvard, Vancouver, ISO, and other styles

29

Escarpinati, Mauricio Cunha. "Desenvolvimento de um sistema computacional para utilização em procedimentos de controle de qualidade em equipamentos mamográficos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-27082007-213453/.

Full text

Abstract:

O presente trabalho consiste na elaboração de uma metodologia envolvendo técnicas computacionais para proporcionar informações provenientes de avaliação de qualidade de equipamentos mamográficos. A investigação conduzida levou em conta, além da necessária determinação de parâmetros operacionais - como tensão de pico (kVp), corrente de tubo, ponto focal, dose, tempo de exposição, camada semi-redutora -, a influência das características do digitalizador usado no processo de digitalização das imagens a ser avaliadas pelo esquema computacional, seja esse um sistema de aquisição digital direta ou i

APA, Harvard, Vancouver, ISO, and other styles

30

Rao, Peddi Srinivas, and Vallabhaneni Sreelatha. "Implementation and Evaluation of Spectral Subtraction with Minimum Statistics using WOLA and FFT Modulated Filter Banks." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2906.

Full text

Abstract:

In communication system environment speech signal is corrupted due to presence of additive acoustic noise, so with this distortion the effective communication is degraded in terms of the quality and intelligibility of speech. Now present research is going how effectively acoustic noise can be eliminated without affecting the original speech quality, this tends to be our challenging in this current research thesis work. Here this work proposes multi-tiered detection method that is based on time-frequency analysis (i.e. filter banks concept) of the noisy speech signals, by using standard speech

APA, Harvard, Vancouver, ISO, and other styles

31

Spalt, Taylor Brooke. "Constrained Spectral Conditioning for the Spatial Mapping of Sound." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/70868.

Full text

Abstract:

In aeroacoustic experiments of aircraft models and/or components, arrays of microphones are utilized to spatially isolate distinct sources and mitigate interfering noise which contaminates single-microphone measurements. Array measurements are still biased by interfering noise which is coherent over the spatial array aperture. When interfering noise is accounted for, existing algorithms which aim to both spatially isolate distinct sources and determine their individual levels as measured by the array are complex and require assumptions about the nature of the sound field. This work develo

APA, Harvard, Vancouver, ISO, and other styles

32

Sedláčková, Eva. "Vlnkový wienerovský filtr EKG signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220843.

Full text

Abstract:

The aim of this work is introduction with method of filtering the ECG signals using wavelet transformation and use of this method for filtering of signal disturbed with myopotencials. The work deals with general properties and with genesis of ECG signals and describes ECG curve. Next part of work is focused on wavelet transformation, types of wavelet transformation and different methods calculation thresholds and thresholding. Design part of work is focused on design Wiener filter for remove myopotencials from ECG signals and finding optimal parameters of this filter using optimization algorit

APA, Harvard, Vancouver, ISO, and other styles

33

Smékal, Ondřej. "Restaurace obrazových dat z optické koherenční tomografie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219497.

Full text

Abstract:

Restoration of image data has become an essential part of the processing of medical images obtained by any system. The same applies in the case of optical coherence tomography. The aim of this work is to study the first restoration methods. Second, the description of the data representation from optical coherence tomography and subsequent discussions that restoration methods based on deconvolution would potentially find application in processing of Optical coherence tomography. Finally, the third to create a program solution of the OCT data restoration process in MATLAB environment and followe

APA, Harvard, Vancouver, ISO, and other styles

34

Zhang, Yuqi. "ROBOMIRROR: A SIMULATED MIRROR DISPLAY WITH A ROBOTIC CAMERA." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/55.

Full text

Abstract:

Simulated mirror displays have a promising prospect in applications, due to its capability for virtual visualization. In most existing mirror displays, cameras are placed on top of the displays and unable to capture the person in front of the display at the highest possible resolution. The lack of a direct frontal capture of the subject's face and the geometric error introduced by image warping techniques make realistic mirror image rendering a challenging problem. The objective of this thesis is to explore the use of a robotic camera in tracking the face of the subject in front of the display

APA, Harvard, Vancouver, ISO, and other styles

35

Juráček, Ivo. "Zabezpečení senzorů - ověření pravosti obrazu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-432921.

Full text

Abstract:

Diploma thesis is about image sensor security. Goal of the thesis was study data integrity gained from the image sensors. Proposed method is about source camera identification from noise characteristics in image sensors. Research was about influence of denoising algorithms applied to digital images, which was acquired from 15 different image sensors. Finally the statistical evaluation had been done from computed results.

APA, Harvard, Vancouver, ISO, and other styles

36

BADARACCO, FRANCESCA. "Newtonian Noise studies in 2nd and 3rd generation gravitational-wave interferometric detectors." Doctoral thesis, Gran Sasso Science Institute, 2021. http://hdl.handle.net/20.500.12571/16065.

Full text

Abstract:

This thesis work fits in the Newtonian noise (NN) cancellation framework for gravitational-wave (GW) detectors of 2nd and 3rd generation. At frequencies below 20 Hz the NN affects GW detectors by generating gravity gradients that mask the GW signals that we want to measure. My work can be divided in three main tasks: the optimization of a seismic array for the NN cancellation in underground detectors, the optimization of a seismic array for Advanced Virgo + (which, respect to the former one, relied on seismic measurements and not on a seismic model) and the evaluation of the NN and the seism

APA, Harvard, Vancouver, ISO, and other styles

37

Ribeiro, Eduardo da Silva. "Novas propostas em filtragem de projeções tomográficas sob ruído Poisson." Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/438.

Full text

Abstract:

Made available in DSpace on 2016-06-02T19:05:43Z (GMT). No. of bitstreams: 1 3115.pdf: 5210903 bytes, checksum: d78cb316f1a90afa1f1d9e435752a5f6 (MD5) Previous issue date: 2010-05-24<br>Financiadora de Estudos e Projetos<br>In this dissertation we present techniques for filtering of tomographic projections with Poisson noise. For the filtering of the tomogram projections we use variations of three filtering techniques: Bayesian estimation, Wiener filtering and thresholding in Wavelet domain. We used ten MAP estimators, each estimator with a diferent probability density as prior information

APA, Harvard, Vancouver, ISO, and other styles

38

Hammarberg, Björn. "A Signal Processing Approach to Practical Neurophysiology : A Search for Improved Methods in Clinical Routine and Research." Doctoral thesis, Uppsala University, Signals and Systems Group, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1957.

Full text

Abstract:

<p>Signal processing within the neurophysiological field is challenging and requires short processing time and reliable results. In this thesis, three main problems are considered.</p><p>First, a modified line source model for simulation of muscle action potentials (APs) is presented. It is formulated in continuous-time as a convolution of a muscle-fiber dependent transmembrane current and an electrode dependent weighting (impedance) function. In the discretization of the model, the Nyquist criterion is addressed. By applying anti-aliasing filtering, it is possible to decrease the discretizati

APA, Harvard, Vancouver, ISO, and other styles

39

Pedone, M. (Matteo). "Algebraic methods for constructing blur-invariant operators and their applications." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526208770.

Full text

Abstract:

Abstract Image acquisition devices are always subject to physical limitations that often manifest as distortions in the appearance of the captured image. The most common types of distortions can be divided into two categories: geometric and radiometric distortions. Examples of the latter ones are: changes in brightness, contrast, or illumination, sensor noise and blur. Since image blur can have many different causes, it is usually not convenient and also computationally expensive to develop ad hoc algorithms to correct each specific type of blur. Instead, it is often possible to extract a blur

APA, Harvard, Vancouver, ISO, and other styles

40

Novotný, Jiří. "Filtrace svalového rušení v EKG signálech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221363.

Full text

Abstract:

This master's thesis deals with the optimization of numerical coefficients of the Wiener filter for muscle noise filtering in ECG signals. The theoretical part deals with ECG signal characteristic and muscle interference. It also contains a summary of the wavelet transform, wavelet Wiener's filtration, methods for calculating of the threshold and thresholding. In the last theoretical part the characteristic optimization techniques, the exhausive search and Nelder-Mead simplex method are mentioned, which were implemented in the practical part of this thesis in MATLAB. The functional verificatio

APA, Harvard, Vancouver, ISO, and other styles

41

Rakotopara, Daniel. "Contribution à l'étude des systèmes non-linéaires." Rouen, 1987. http://www.theses.fr/1987ROUES023.

Full text

Abstract:

Etude d'une commande non-linéaire discrète de colonne à distiller. Mise au point grâce à un observateur asymptotique non-linéaire dont on donne les conditions suffisantes d'existence. Etude du calcul de Malliavin par l'approche de la décomposition fonctionnelle de Wiener à base de chaos. On démontre l'absolue continuité des équations du filtrage relativement à la mesure de Lebesgue. On s'intéresse aussi au problème de filtrage avec observation en partie non bruitée

APA, Harvard, Vancouver, ISO, and other styles

42

Marin, Jorge I. "Robust binaural noise-reduction strategies with binaural-hearing-aid constraints: design, analysis and practical considerations." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44747.

Full text

Abstract:

The objective of the dissertation research is to investigate noise reduction methods for binaural hearing aids based on array and statistical signal processing and inspired by a human auditory model. In digital hearing aids, wide dynamic range compression (WDRC) is the most successful technique to deal with monaural hearing losses. This WDRC processing is usually performed after a monaural noise reduction algorithm. When hearing losses are present in both ears, i.e., a binaural hearing loss, independent monaural hearing aids have been shown not to be comfortable for most users, preferring a pr

APA, Harvard, Vancouver, ISO, and other styles

43

Zamazal, Zdeněk. "Číslicové zpracování signálů v reálném čase." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219215.

Full text

Abstract:

This work deals with digital signal processing in the field of adaptive filtering. Fundamental basics of adaptive filtering are described and primary aim is to create executable laboratory examples, using adaptive filtering, in LabView programming language. These laboratory examples are intended to be used by students fo studying and during laboratory lessons. Objective is to connect the examples with external devices, such as microphone. A microphone is used as an user's speech input acquiring interface. In the thesis is depicted Wiener's filter and problem of adaptive filtering is discussed.

APA, Harvard, Vancouver, ISO, and other styles

44

Mallon, Agnès. "Reconstruction 3D pour la tomographie par émission de positons avec mesure du temps de vol." Grenoble 1, 1993. http://www.theses.fr/1993GRE10159.

Full text

Abstract:

La tomographie par emission de positons est une technique d'imagerie medicale qui permet d'etudier le metabolisme des organes par mesure de la consommation d'oxygene ou de glucose. La recherche actuelle tend a ameliorer la qualite statistique des images, d'une part par la prise en compte des projections obliques, et d'autre part en mesurant la difference de temps de vol des photons emis. Cette these propose des methodes de reconstruction analytiques pour ce probleme inverse. Dans un premier temps, nous abordons le probleme de la reconstruction avec uniquement les mesures completes. Notre premi

APA, Harvard, Vancouver, ISO, and other styles

45

Wang, Jingbo. "Multi-channel Wiener filters and their application to seismic array data." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608809.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Bowman, Kevin W. "Application of wavelets to adaptive optics and multiresolution wiener filtering." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/14920.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Castro, Márcia Luciana Aguena. "Super resolução baseada em métodos iterativos de restauração." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/285.

Full text

Abstract:

Made available in DSpace on 2016-06-02T19:03:57Z (GMT). No. of bitstreams: 1 5415.pdf: 8638421 bytes, checksum: 0e5c5abf95c786434202fdae3e69dc1e (MD5) Previous issue date: 2013-06-24<br>Financiadora de Estudos e Projetos<br>The resolution enhancement of an image is always desirable, independently of its objective, but mainly if the image has the purpose of visual analysis. The hardware development for increasing the image resolution still has a higher cost than the algorithmic solutions for super-resolution. Like image restoration, super-resolution is also an ill-conditioned inverse proble

APA, Harvard, Vancouver, ISO, and other styles

48

Neimert-Andersson, Thomas. "3D imaging using time-correlated single photon counting." Thesis, Uppsala University, Signals and Systems Group, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121104.

Full text

Abstract:

<p>This project investigates a laser radar system. The system is based on the principles of time-correlated single photon counting, and by measuring the times-of-flight of reflected photons it can find range profiles and perform three-dimensional imaging of scenes. Because of the photon counting technique the resolution and precision that the system can achieve is very high compared to analog systems. These properties make the system interesting for many military applications. For example, the system can be used to interrogate non-cooperative targets at a safe distance in order to gather intel

APA, Harvard, Vancouver, ISO, and other styles

49

Barnes, Leighton P. (Leighton Pate). "Uniform FIR approximation of causal Wiener filters with applications to causal coherence." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100295.

Full text

Abstract:

Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 35-36).<br>Leveraging the relationship between Wiener filtering and the coherence function, a version of coherence is defined that captures the causal relationship between WSS processes. This causal coherence is interpreted

APA, Harvard, Vancouver, ISO, and other styles

50

Warner, Carl Michael 1952. "ESTIMATION OF NONSTATIONARY SIGNALS IN NOISE (PROCESSING, ADAPTIVE, WIENER FILTERS, ESTIMATION, DIGITAL)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291297.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!