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Dissertations / Theses on the topic 'DWT'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Bis, Jan. "Řízení převíječky sádrokartonářské pásky (DWT)." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316067.

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This thesis deals with a description of the industrial machine of the DWT (drywall tape) rewinder. The winder rewinds and cuts the drywall tape tape into smaller tapes, that are then sold. The first part contains a description of the winder, its structure and functions of its individual parts. The second part contains a description of the control system and the power wiring of winder. The next section contains a description of programming and setting of PLC, frequency inverters, and touch panel. Some modifications are then described when putting the winder into operation. The winder has been s
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Wichakool, Warit 1977. "A comparative study of DCT, LOT, and DWT-based image coders." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86749.

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Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.<br>Includes bibliographical references (leaves 108-109).<br>by Warit Wichakool.<br>M.Eng.and S.B.
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Kupka, Jan. "Vodoznačení digitálních dat." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217292.

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The main aim of this project is to implement two different types of the watermarking algorithm in frequency (transforamtion) domain. Because of the huge amount of the watermarking algorithms is this thesis dedicated to the watermarking methods in the frequency domain. These methods use kind of transformation implemented on the original data, the second step is modification of transformation coeficients. This project is dedicated to the methods which use discrete wavelet transformation. Nowdays the most popular transformation, which meets the best efforts. The aim of every method is to embeed t
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Murugesan, Somasekar. "Benchmarking of Sleipnir DSP Processor, ePUMA Platform." Thesis, Linköpings universitet, Datorteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-74080.

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Choosing a right processor for an embedded application, or designing a new pro-cessor requires us to know how it stacks up against the competition, or sellinga processor requires a credible communication about its performance to the cus-tomers, which means benchmarking of a processor is very important. They arerecognized world wide by processor vendors and customers alike as the fact-basedway to evaluate and communicate embedded processor performance. In this the-sis, the benchmarking of ePUMA multiprocessor developed by the Division ofComputer Engineering, ISY, Linköping University, Sweden wi
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Ghosh, Debeshi D. "Audio Watermarking Using DWT Algorithm and Symmetric Key Cryptography." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10263604.

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<p> Watermarking is the process of embedding information into a carrier signal such as audio, video, and images. It is widely used to protect proprietary information in the signal to prevent information theft or duplicity. In this project, an audio watermarking system with dual layer security has been implemented. The entire system is divided into two sections that are independent, but have been combined, to make a unique system that provides increased levels of robustness. The first part of the project involves encrypting an embedded image (watermark) using the XOR method of symmetric key cry
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Fontes, Ramiro C. "Applications of Allouba's Differentiation Theory and Semi-SPDEs." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1271438954.

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Mei, Liming, and james mei@ieee org. "A DWT Based Perceptual Video Coding Framework - Concepts, Issues and Techniques." RMIT University. Electrical and Computer Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090506.103244.

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The work in this thesis explore the DWT based video coding by the introduction of a novel DWT (Discrete Wavelet Transform) / MC (Motion Compensation) / DPCM (Differential Pulse Code Modulation) video coding framework, which adopts the EBCOT as the coding engine for both the intra- and the inter-frame coder. The adaptive switching mechanism between the frame/field coding modes is investigated for this coding framework. The Low-Band-Shift (LBS) is employed for the MC in the DWT domain. The LBS based MC is proven to provide consistent improvement on the Peak Signal-to-Noise Ratio (PSNR) of the co
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Islam, Mohd Siblee. "A Decision Support System for StressDiagnosis using ECG Sensor." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-11769.

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Diagnosis of stress is important because it can cause many diseases e.g., heart disease, headache, migraine, sleep problems, irritability etc. Diagnosis of stress in patients often involves acquisition of biological signals for example heart rate, finger temperature, electrocardiogram (ECG), electromyography signal (EMG), skin conductance signal (SC) etc. followed up by a careful analysis of the acquired signals. The accuracy is totally dependent on the experience of an expert. Again the number of such experts is also very limited. Heart rate is considered as an important parameter in determin
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9

Sedlář, Karel. "Komprese genomických signálů pro klasifikaci a identifikaci organismů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220018.

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Modern classification of organisms is performed on molecular data. These methods rely on multiple alignment of sequences of characters which make them computationally demanding. Only small parts of genomes can be compared in reasonable time. In this paper, the novel algorithm based on conversion of the whole genome sequences to cumulative phase signals is presented. Dyadic wavelet transform is used for lossy compression of signals by redundant frequency bands elimination. Signal classification is then performed as a cluster analysis using Euclidian metrics where multiple alignment is replaced
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SOUZA, MARCIO ALBUQUERQUE DE. "ARBITRARILY SHAPED OBJECT CODING USING SHAPE-ADAPTATIVE DWT AND SHAPE-ADAPTATIVE SPIHT." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1748@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Codificação de objetos de forma arbitrária extraídos de imagens regulares é um dos assuntos de maior desafio nos mais recentes padrões de codificação de vídeo (MPEG-4). Neste estudo, é proposta uma nova estratégia de codificação de objetos envolvendo maior eficiência na decomposição e quantização de sub-bandas. A técnica de transformação proposta envolve Transformada Wavelet Discreta (DWT) e a de quantização é baseada no algoritmo de Partição de Conjuntos em Árvores Hierárquicas (SPIHT).<br>Coding of arbitrarily shaped obj
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Bernardo, Luiz Carlos. "Sistemas de comunicação utilizando transmissão OFDM baseado em wavelets com subportadoras com modulação caótica." Universidade Presbiteriana Mackenzie, 2013. http://tede.mackenzie.br/jspui/handle/tede/1434.

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Made available in DSpace on 2016-03-15T19:37:47Z (GMT). No. of bitstreams: 1 Luiz Carlos Bernardo.pdf: 7288586 bytes, checksum: b7562f834db8a5ce808707075e7ce04b (MD5) Previous issue date: 2013-06-14<br>A chaotic signal based communication system represents a new wideband transmission model. Nonetheless, chaotic based systems have not yet shown a distinguished performance in terms of bit error rate when transmitted in narrow band channels or in the presence of impairments in comparison to the traditional communications systems. The focus of this work relies on an experiment that overcomes thi
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WANG, YING. "PILOT SYMBOL-BASED WAVELET COMMUNICATIONS FOR WIDEBAND FAST-FADING CHANNELS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148319204.

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RAWAT, URVASHI. "INFRARED AND VISIBLE IMAGE FUSION USING HYBRID LWT AND PCA METHOD." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18907.

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Image fusion is a method in which all the relevant information is collected from the input source images and included in few/single output image. Image fusion techniques are divided into two broad categories: spatial domain and transform domain. Principal component analysis (PCA) is a spatial domain technique which is computationally simpler and reduces redundant information but has the demerit of spectral degradation. Lifting wavelet transform (LWT) is a transform domain technique which has an adaptive design and demands less memory. In this project, a novel hybrid fusion algorithm has
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Zhang, Xun. "Contribution aux architectures adaptatives : etude de l'efficacité énergétique dans le cas des applications à parallélisme de données." Thesis, Nancy 1, 2009. http://www.theses.fr/2009NAN10106/document.

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Cette thèse s'inscrit dans le cadre de la conception d'architectures reconfigurables. Plus précisément, il concerne les architectures matérielles adaptatives, ces dernières pouvant être modifiées du point de vue de leurs caractéristiques matérielles au cours de l'exécution d'une application. Nous présentons une méthodologie d'auto-configuration d'une architecture reconfigurable dynamiquement ainsi qu'une architecture permettant d'illustrer l'utilisation de la méthode. L'objectif de la méthode est de réduire la consommation d'énergie en garantissant le respect des contraintes à tout instant. La
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Al-hussiany, Yahya Ali Lafta. "Novel DWT-DAPSK based transceivers for DVB-T transmission and next generation mobile networks." Thesis, Liverpool John Moores University, 2012. http://researchonline.ljmu.ac.uk/6168/.

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Digital wireless communication has become one of the most exciting research topics in the electronic engineering field due to the explosive demands for high-speed wireless services, such as cellular video conferencing. The second generation Terrestrial Digital Video Broadcasting (DVB- T2) has been demonstrated to provide digital communication services with very high spectral efficiency and significantly improved performance. Orthogonal Frequency Division Multiplexing (OFDM) systems have been increasingly deployed in mobile networks for their spectral efficiency and optimum bit error rate. An O
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Campitelli, Marcelo Adrián. "Compressão de sinais ECG utilizando DWT com quantização não-linear e por sub-bandas." reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.12.D.19564.

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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Elétrica, 2015.<br>Submitted by Albânia Cézar de Melo (albania@bce.unb.br) on 2016-02-23T16:38:33Z No. of bitstreams: 1 2015_MarceloAdrianCampitelli.pdf: 2323124 bytes, checksum: 45791074bc64885c0526dc991339d062 (MD5)<br>Approved for entry into archive by Marília Freitas(marilia@bce.unb.br) on 2016-02-25T12:57:08Z (GMT) No. of bitstreams: 1 2015_MarceloAdrianCampitelli.pdf: 2323124 bytes, checksum: 45791074bc64885c0526dc991339d062 (MD5)<br>Made available in DSpace on 2016-02-25T12:57:08Z (GM
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Konczi, Róbert. "Digitální hudební efekt založený na waveletové transformaci jako plug-in modul." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218981.

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This work deals with theory of wavelet transform and Mallat’s algorithm. It also includes the programming method of creating VST plug-in modules and describes the developement of the plug-in module, witch uses the modificated coeficients of wavelet transform to applicate the music effect.
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Silva, Sandro Vilela da. "Projeto de uma arquitetura dedicada à compressão de imagens no padrão JPEG2000." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/7838.

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O incremento das taxas de transmissão e de armazenamento demanda o desenvolvimento de técnicas para aumentar a taxa de compressão de imagens e ao mesmo tempo mantenha a qualidade destas imagens. O padrão JPEG2000 propõe a utilização da transformada wavelet discreta e codificação aritmética para alcançar altos graus de compressão, proporcionando que a imagem resultante tenha qualidade razoável. Este padrão permite tanto compressão com perdas como compressão sem perdas, dependendo apenas do tipo de transformada wavelet utilizada. Este trabalho propõe a implementação de blocos internos em hardwar
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Rout, Satyabrata. "Orthogonal vs. Biorthogonal Wavelets for Image Compression." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/35084.

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Effective image compression requires a non-expansive discrete wavelet transform (DWT) be employed; consequently, image border extension is a critical issue. Ideally, the image border extension method should not introduce distortion under compression. It has been shown in literature that symmetric extension performs better than periodic extension. However, the non-expansive, symmetric extension using fast Fourier transform and circular convolution DWT methods require symmetric filters. This precludes orthogonal wavelets for image compression since they cannot simultaneously possess the desirabl
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Maszewski, Mirosław. "Kodowanie i rozpoznawanie obrazów z wykorzystaniem zespolonych funkcji bazowych." Rozprawa doktorska, [Nakł.aut.], 2006. http://dlibra.utp.edu.pl/Content/140.

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Celem pracy było wykazanie możliwości zastosowania zespolonego dyskretnego przekształcenia falkowego do celów skutecznego kodowania i rozpoznawania obrazów w telekomunikacyjnym systemie przetwarzania obrazów
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Holdova, Kamila. "Klasifikace spánkových EEG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219944.

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This thesis deals with wavelet analysis of sleep electroencephalogram to sleep stages scoring. The theoretical part of the thesis deals with the theory of EEG signal creation and analysis. The polysomnography (PSG) is also described. This is the method for simultaneous measuring the different electrical signals; main of them are electroencephalogram (EEG), electromyogram (EMG) and electrooculogram (EOG). This method is used to diagnose sleep failure. Therefore sleep, sleep stages and sleep disorders are also described in the present study. In practical part, some results of application of disc
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Bai, Cong. "Analyse d'images pour une recherche d'images basée contenu dans le domaine transformé." Phd thesis, INSA de Rennes, 2013. http://tel.archives-ouvertes.fr/tel-00907290.

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Cette thèse s'inscrit dans la recherche d'images basée sur leur contenu. La recherche opère sur des images eprésentéesdans un domaine transformé et où sont construits directement les vecteurs de caractéristiques ou indices. Deux types detransformations sont explorés : la transformée en cosinus discrète ou Discrete Cosine Transform (DCT) et la transforméen ondelettes discrète ou Discrete Wavelet Transform (DWT), utilisés dans les normes de compression JPEG et JPEG2000. Basés sur les propriétés des coefficients de la transformation, différents vecteurs de caractéristiquessont proposés. Ces vecte
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Novotný, Radek. "Aplikace waveletové transformace v software Mathematica a Sage." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220339.

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This thesis focuses on image processing using wavelet transform. The usage of wavelet transform is analysed especially for image compression and image noise reduction purposes. The analysis describes in detail aspects and application of the following wavelet transform methods: CWT, DWT, DTWT, 2D DWT. The thesis further explains the meaning of the mother wavelet and studies certain specific kinds of wavelets, kinds of thresholding and its purposes and also touches on the JPEG2000 standard. Mathematica and Sage software packages were used to design algorithms for image compression and image nois
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Zhu, Dongqing. "Time-frequency and Hidden Markov Model Methods for Epileptic Seizure Detection." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1242070584.

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Mikulčík, Ondřej. "Pokročilé metody pro zabezpečení multimediálních dat." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220611.

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To protect the the copyright of multimedia works have been developed watermarking techniques, that insert an invisible watermark to the original data. The aim of this thesis was to explore modern watermarking techniques, choose three of them and realize them. Also test them, evaluate their properties and possibly improve them. All methods insert a watermark into luminance component of the original image, and work with binary or black and white watermark. All techniques work in the frequency domain using discrete wavelet transform. For the implementation of methods, have been developed software
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陳毓宏. "Reconfigurable IP of DCT and DWT for image transform coding." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/06295153574776263281.

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碩士<br>國立交通大學<br>電機學院IC設計產業專班<br>97<br>This paper presents a design and development of a reconfigurable architecture for image transform coding. Because of DCT (Discrete Cosine Transform) is usually used in JPEG, MPEG, and H.26X system. And DWT (Discrete Wavelet Transform) is used in JPEG2000 system. They are both the part that damage huge computations in system. So we want to integrate DCT and DWT architectures with the same hardware to reduce hardware requirement for these system. To merge DWT into DCT, we use butterfly structure for DCT and 9/7 convolution based structure for DWT that not on
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Hsu, Yi-min, and 許逸民. "Image Tamper Detection and Recovery based on DWT and DCT." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/60903685477926912861.

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碩士<br>立德大學<br>應用資訊研究所<br>95<br>In this paper, a reversible data embedding for tamper-proof watermarks technique is proposed. In generally, watermarking is used for the purpose of ownership protection. The important regions in the image can be selected by the users as the region of interest (ROI) to protect. And those ROIs are regarded as the watermark and then being embedded in the image. When these important regions are tampered or faked by malicious attacker, the system can detect and recover the ROI. The system extracts the characteristic values by Discrete Cosine Transform (DCT) and e
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Hsu, Heng-chia, and 許恆嘉. "PCB Edge Detection with DWT." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/16419932987493613598.

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碩士<br>國立交通大學<br>電機與控制工程系<br>89<br>To develop an appropriate algorithm for PCB (Printed Circuit Board) image edge detection is the main subject of this thesis. The algorithm proposed in this thesis can be applied only on digital gray-level images of PCBs. Instead of the conventional idea of difference, DWT (Discrete Wavelet Transform), an alternative and novel method for basis change despite Fourier Transform, is employed. In this thesis, digital gray-level images of PCB are considered as vectors existing in the vector space constructed by selected basis that are the dilations and
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Sahu, Saurabh. "Efficient Image Fusion Using DWT." Thesis, 2015. http://ethesis.nitrkl.ac.in/7309/1/2015_Efficient_Sahu.pdf.

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The method of combining important details from two or more source images into a final fused image is known as Image Fusion. When compared to any of the other input images, our fused output image will have more detailed information in it. The objective of image fusion is to obtain the most desirable data from each image. Multi sensor image fusion algorithm based on three different fusion techniques have been discussed in this paper. Those are “Pixel Level Iteration”, “Directional Discrete Cosine Transform (DDCT)”, and “Discrete Wavelet Transform (DWT)”. The outcomes are additionally outfitted i
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Yi-Chia, Chuang, and 莊益嘉. "VLSI Architecture Design of DCT-based to DWT-based Image Transcoder." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/70130900366990960482.

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碩士<br>國立清華大學<br>電機工程學系<br>90<br>The wavelet-transform based image compression technique has been widely used in the newest image compression standards, such as JPEG200 and MPEG4. In spite of high compression rate and flexibility in the ultilization of wavelet-transform, older image compression technique, DCT-transform is still used in the older image compression standards, such as MPEG1, MPEG2 and H.263. Because of the coexistence of DCT-transform and DWT-transform, we try to design a DCT to DWT transcoder. If we have this kind of transcoder, the incompatibility between older image compression
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Lo, Pi-Te, and 羅彼得. "A New Robust Image Watermarking Technique Based on DWT and DFT." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/fnbpk5.

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Ku, Ching-Shiuan, and 辜慶軒. "The Digital Watermarking Embedding Technology Based on DWT-SVD-DCT Transformation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/21811625457269424478.

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碩士<br>國立宜蘭大學<br>電子工程學系碩士班<br>102<br>In the information age, a large amount of digital image information can be acquired from the Internet. However, any unauthorized tampering may seriously jeopardize the legitimate interests of the digital information owner, and the protection of intellectual property rights has become an important issue. Hence, image watermarking is used to resolve the intellectual property contentious issues. For many transform-domain watermarking techniques, attempts have been made to exploit various transformations to extract image features, and then embed the watermark in
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Lin, Hung-ju, and 林宏儒. "A Study of DWT-Based Steganography." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/626fm8.

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碩士<br>朝陽科技大學<br>網路與通訊研究所<br>93<br>Abstract In this thesis, we proposed a novel stegangraphy method utilizing the features obtained from Discrete Wavelet Transform (DWT). Applying a secure coding scheme, the secret messages are embedded into the three high frequency sub-bands of DWT coefficients. Since the portion which human eyes are sensitive to, the low frequency sub-band, remains unaltered, the image quality after secret messages embedding is increased. According to different needs of embedding capacity, we explain the embedding method in five cases. In addition to high embedding capacity a
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Tsai, Cheng-Fu, and 蔡正富. "A DWT-Based Digital Audio Watermarking." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/72166077143270442932.

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碩士<br>國立東華大學<br>資訊工程學系<br>92<br>In audio signals, with the widespread use of Internet and proliferation of digital audio distribution in MP3 form make the copyright protection of digital audio works more and more important. In this thesis, a DWT-based digital audio watermarking is proposed. With the Discrete Wavelet Transform（DWT）, the audio signal can be transformed into frequency domain ranging from low frequency to high frequency. Besides, the high frequency spectrum is less sensitive to human ear. That is the reason why the high frequency component is usually discarded in the compression p
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Anoh, Kelvin O. O., Raed A. Abd-Alhameed, Steven M. R. Jones, Yousef A. S. Dama, and Mohammed S. Bin-Melha. "On the wavelet families for OFDM system comparisons over AWGN and Rayleigh Channels." 2013. http://hdl.handle.net/10454/9609.

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No<br>In the study of OFDM systems, discrete wavelet transforms have been reported to perform better than Fast Fourier Transform in multicarrier systems (MCS) - in terms of spectral efficiency because they can operate without a cyclic prefix, have reduced side-lobes and improved BER. However all of the wavelet families do not perform alike. This study has investigated various wavelet families such as Daubechies, Symlet, Haar (or db1), biorthogonal, reverse-biorthogonal and Coiflets for OFDM system design over an AWGN and multipath channels. Results show that Daubechies, Symlet, Haar and Coifle
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Kuo, Ping-nan, and 郭炳南. "Watermarking Scheme based on Majority Voting，DWT-DCT Composite and Error Correction Techniques." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/66004911284990449929.

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碩士<br>國立中興大學<br>電機工程學系所<br>97<br>Abstract— In this thesis we present a digital watermarking scheme that is based on DWT-DCT composite, error correction code and majority judgement techniques. For the purpose of increasing the robustness of watermarking against attacks from image transmission, we encode an image and embedded watermarks by Turbo code with error correction capability. Three identity encoded watermarks was embedded into the host image, two watermarks were using a combine method of the Discrete Wavelet Transform (DWT) and the Discrete Cosine Transform (DCT) algorithm and the other
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Lan, Ming-Fu, and 藍明富. "Architecture Design and VLSI Implementation of DCT-based to DWT-based Image Transcoder." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/91926960016897932715.

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碩士<br>國立清華大學<br>電機工程學系<br>89<br>Abstract The wavelet-transform based applications and their architecture design have been widely discussed in literature, and already proposed for image compression standard of modern era. The main advantage of using DWT is to cope with high compression demand and still get good image quality. Another advantage is its high scalability. According to these features, DWT- based images are extremely suitable for transmission over the Internet. Nevertheless, most of the image data are DCT-based. For this reason, we propose a DCT-based to DWT-based image tr
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Hsu, Wen-long, and 徐文龍. "An IP Design of DWT with BIST." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/01478840155438936594.

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碩士<br>中華大學<br>資訊工程學系碩士班<br>88<br>Recently, Discrete Wavelet Transform (DWT) has been widely used in many applications. These applications include signal processing, image processing, numerical, statistical, and medical analysis. Compared with other transforms, such as Fourier transform and discrete cosine transform (DCT), DWT has the following advantages: 1. Can provide appropriate time-frequency window, 2. Can reduce the distortion of signal analysis, 3. The complexity of computation is O(N), and 4. Can be easily implemented by VLSI design. Based on these advantages, DWT becomes very convenie
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Ting-Hsun, Wei, and 魏廷勳. "Generic DWT Processors using Limited Resource Scheduling." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/94506417940935624496.

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碩士<br>國立交通大學<br>電機與控制工程系<br>89<br>Wavelet transformations have become interesting to the signal processing society in the last decade. The Discrete Wavelet Transformation (DWT) has been employed in DSP applications such as signal analysis, image processing, numerical analysis, fractal analysis, and so on. Research of DWT implementation has focused on decreasing the storage size and increasing hardware utilization; however, very few papers deal with the limited-resource implementation. The limited-resource implementation is one of the most important issues in System-On-Chip (SOC) design. Th
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WANG, SHIH-WEN, and 王世文. "CDMA-based Watermarking Schemes in DWT Domain." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/18608246868379486169.

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博士<br>國立暨南國際大學<br>資訊工程學系<br>104<br>In recent years, Smart mobile devices have become widely used because of their low cost and user –friendly. Thus it makes the protection of digital data copyrights be taken seriously. The digital watermarking technology means that hiding the secret message (watermark) into the carrier (image or video) that the naked eye of the people cannot perceive any abnormality, and thus to achieve the protection of copyrights. This dissertation first exploits a method which spreads the watermark by the CDMA technology and hides the spread data in the DWT domain. Next, a
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Patel, Kiran. "Hardware Architecture for Image Denoising Using DWT." Thesis, 2016. http://ethesis.nitrkl.ac.in/9299/1/2016_MT_KPatel.pdf.

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The use of multiresolution technique for time-frequency analysis of signal with high directionality has found its widespread acceptance in many digital image processing applications. The demand of high speed processing and time critical tasks required a time efficient hardware implementation of such techniques. In this thesis we design and implement a flexible hardware architecture for the 2D Discrete Wavelet Transform (DWT). This architecture can be configured to perform both the forward and inverse DWT for any DWT family, using fixed-point arithmetic and without auxiliary memory. The impleme
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Jassim, Taha D., Hussain Al-Ahmad, Raed A. Abd-Alhameed, and Ahmed M. N. Al-Gindy. "Two levels block based wavelet watermarking algorithm for still colour images." 2014. http://hdl.handle.net/10454/10656.

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No<br>A robust watermarking technique is implemented for copyright protection. The proposed method is based on 2-level discrete wavelet transform (DWT). The embedded watermarking information is a mobile phone number including the international code. The first level of the DWT transformation is applied on 16×16 blocks of the host image. All the coefficients of the 8×8 low-low (LL1) first level sub-band are grouped into one matrix. The second level of the DWT is then applied to the grouped matrix from the first level transformation. The highest coefficient from the LL2 sub-band (4×4) is used for
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Lin, YihFeng, and 林義峰. "A Robust DWT-based Watermarking for Still Images." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/60067665811326118484.

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碩士<br>國立東華大學<br>資訊工程學系<br>89<br>This thesis presents a simple and effective DWT-based frequency-domain image watermarking technique. The watermark information is inserted into all significant coefficients of wavelet quadtrees. To provide the maximum strength transparent watermark, the characteristics of the human visual system (HVS) on frequency-domain have been incorporated into the watermark insertion design. For robustness, we proposed three ideas: (1) Significant coefficients of wavelet quadtree, (2) Adaptive threshold, α, and (3) The weight, γ , imposed on the JND value of each subband.
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Luo, Min-Yao, and 羅銘耀. "A DWT-based Watermarking Scheme for Color Images." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/25403665581792550221.

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碩士<br>國立東華大學<br>資訊工程學系<br>92<br>A robust DWT-based watermarking for color image scheme is proposed in this thesis. Most watermarking researches emphasized on gray image in recent years. To welcome the era of multimedia, we must develop the digital watermarking technique for color image. Because color image includes the information of three R G B color channels, and correlation exists among RGB color channels, the watermark should not be directly embedded into any RGB channel. The RGB color spaces are first converted into YCbCr color spaces. Followed by this transformation, the watermarking t
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Huang, Pei-Ming, and 黃培銘. "Image Sharing Watermarking Scheme Base on DWT-SVD." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76876128750231482700.

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碩士<br>國立宜蘭大學<br>資訊工程研究所碩士班<br>96<br>In this paper, one kind of new watermarking technology was proposed .It will improve robustness of the watermark. We use non-extend visual cryptography to produce two share images. Simultaneously it may also solve the existing conditions : public verification and watermark security. In the first share image , we use the DWT and SVD transformation. And we can not only get the more robust and stabile watermark to resist all kinds of the attacks, but also we don’t need original image to extract watermark, so it can enhance quality and won’t waste storage. Final
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lan, Sheng-yu, and 藍勝宇. "A DWT based Robust Watermarking for Copyright Protection." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/zjd655.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>96<br>Because of the arrival of digital world, media in digital form can be easily altered, duplicated and spread which causes the rights and interests of original author and copyright owner are compromised or destroyed. Therefore, the protection of the intellectual property rights of digital information has come to attention. Digital watermark provides a simple and effective way of protection for property of the kind. Nowadays, more and more studies have been thrown to the field of digital watermark. In this thesis, a method of robustness and blind extraction wa
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李俐玲. "A Key-based image Watermarking system using subblock composition in DCT domain and DWT domain." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/12592683760167293037.

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碩士<br>國立中央大學<br>電機工程研究所<br>89<br>In this thesis, we propose a novel watermarking system that is highly robust against attacks without perceptible image degradation. In addition, the original image is not needed in watermark extraction. It operates either in the DWT domain or the DCT domain. This system integrates three important ideas to provide extellent watermarking performance. The first idea is to use a secret key that is generated based on the watermark logo and the host image. Based on the polarity of the transform coefficients and the key, the original watermark can accuratel
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Asif, Rameez, Abubakar S. Hussaini, Raed A. Abd-Alhameed, et al. "Performance of different wavelet families using DWT and DWPT-channel equalization using ZF and MMSE." 2013. http://hdl.handle.net/10454/9618.

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No<br>We have studied the performance of multidimensional signaling techniques using wavelets based modulation within an orthogonally multiplexed communication system. The discrete wavelets transform and wavelet packet modulation techniques have been studied using Daubechies 2 and 8, Biothogonal1.5 and 3.1 and reverse Biorthognal 1.5 and 3.1 wavelets in the presence of Rayleigh multipath fading channels with AWGN. Results showed that DWT based systems outperform WPM systems both in terms of BER vs. SNR performance as well as processing. The performances of two different equalizations technique
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Yang, Xin-Lun, and 楊鑫崙. "A DWT-based Watermarking Scheme with Multi-bands’ Detection." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/52942391123810393620.

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碩士<br>國立東華大學<br>資訊工程學系<br>90<br>Abstract A feasible DWT-based watermarking scheme is proposed in this thesis. The scheme is designed based on the idea of extracting watermark from those stable trends of DWT subbands’ distribution. The watermark is embedded by modifying all coeffi-cients of each subband according to their modifiable capacity. The modification of coefficients is based on aspect of implementation and observation on DWT in digital image. It is also mentioned that how different attacks influence the ability of watermark scheme under similar structure and how the watermark extracted
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李國彰. "Parity-check fragile watermarking and DWT-based robust watermarking." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/78427328796652637958.

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碩士<br>國立臺灣師範大學<br>機電科技研究所<br>92<br>In this research, we focus on the issues of the digital image authentication and ownership verification. We proposed a fragile watermarking and two robust watermarking algorithms to solve these problems respectively: A parity-check fragile watermarking technique for color image authentication is proposed. First, we generate a series of random numbers with the number equal to the number of pixels in the image. The random numbers are used to select predefined patterns for parity checking. The LSB of each pixel is encoded according to the result of pa
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