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Showing 1 to 20 of 69 for “"DWT"”.

  1. Hybrid DWT-DCT algorithm for image and video compression applications

    Shrestha, SuchitraUniversity of Saskatchewan2010

    … Transform (DCT) and Discrete Wavelet Transform (DWT) are the most commonly used transformation. DCT has high energy compaction property and requires less computational resources. On the other hand, DWT is multiresolution transformation. In this work, we propose a hybrid DWT-DCT algorithm for …

    sask Repository record

  2. A comparative study of DCT, LOT, and DWT-based image coders

    Wichakool, Warit, 1977-Massachusetts Institute of Technology2001

    Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.

    mit Repository record

  3. Novel DWT-DAPSK based transceivers for DVB-T transmission and next generation mobile networks

    Al-hussiany, Y A LLiverpool John Moores University2012

    … system design. Discrete Wavelet transform (DWT) based OFDM systems naturally overcome these disadvantages by their design methodology and the technique of transmitting concentrated energy over small spectral coefficients. Several types of modulation schemes such as DPSK, QAM are employed in …

    liverpool-jm Repository record

  4. A comparison of discrete cosine transform and discrete wavelet transform algorithm in watermarking against common attacks

    Said, Mohamed AbdisalanUniversiti Tun Hussein Onn Malaysia2015

    … Transform (DCT) and Discrete Wavelet Transform (DWT). In this report, the DCT watermarking algorithms and DWT watermarking algorithms were compared based on robustness and imperceptibility criteria. With DCT, the watermark bits were embedded into the mid-band coefficients of the DCT in the cover …

    uthm Repository record

  5. An FPGA-based Run-time Reconfigurable 2-D Discrete Wavelet Transform Core

    Ballagh, Jonathan BartlettVirginia Tech2001

    … of a two-dimensional discrete wavelet transform (DWT) core using the JBits run-time reconfigurable FPGA design tool suite. Several aspects of the design process are discussed, including implementation, simulation, debugging, and hardware interfacing to a reconfigurable computing platform. The DWT …

    vt Repository record

  6. Analysis of Wavelet Based Alternatives for OFDM

    Rashed, Tassniem2019

    … We analyze DFT, discrete wavelet transform (DWT), and dual tree complex wavelet transform (DT-CWT) based systems in an additive white Gaussian noise (AWGN) channel. The analysis is verified by Monte Carlo simulation. The results in the thesis indicate that the bit error probability (BEP) …

    mississippi Repository record

  7. A comparative study of watermarking techniques in spatial and frequency domains

    Ali Alamari, Abduladhim MohamadUniversiti Tun Hussein Onn Malaysia2014

    … frequency domains Discrete Wavelet Transform (DWT) in cover image, had been proposed. A simulation of the proposed method was done in order to determine the robustness and imperceptibility of the watermarked image when exposed to various attacks. The simulation of the proposed method was done …

    uthm Repository record

  8. Image interpolation and denoising in discrete wavelet transform domain

    Wu, Shaojie

    … denoising in the Discrete Wavelet Transform (DWT) domain. This method, however, has the drawback of blurring the edges and the textures of an image after denoising. A new algorithm is proposed in this thesis for image denoising in the DWT domain with no blurring effect. This algorithm uses a …

    unlv Repository record

  9. Astronomical image manipulation in the transform domain

    Chen, Biao

    … (DCT) and the Discrete Wavelet Transform (DWT), respectively. In this thesis, a suite of image processing algorithms in the transform domain, DCT and DWT, is developed. In particular, new methods for edge enhancement and minimum (MIN)/maximum (MAX) gray scale intensity estimation in the DCT …

    unlv Repository record

  10. Segmentace cév v obrazech sítnice

    Walczysko, MartinVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií

    … snímku a dekompozice obrazu pomocí 2D DWT. Dále je prozkoumána možnost prahovaní parametrických obrazů vzniklých průchodem snímku 2D DWT. Byly navrženy algoritmy pro odstranění nejdůležitějších artefaktů z hrubé binární reprezentace cévního řečiště. Realizace algoritmu proběhla v …

    brno-tech Repository record

  11. New control charts for monitoring univariate autocorrelated processes and high-dimensional profiles

    Lee, JoongsupGeorgia Institute of Technology2011

    … region. Exploiting a discrete wavelet transform (DWT) of the mean in-control profile, WDFTC selects a reduced-dimension vector of the associated DWT components from which the mean in-control profile can be approximated with minimal weighted relative reconstruction error. Based on randomly sampled …

    gatech Repository record

  12. Efficient architectures of heterogeneous fpga-gpu for 3-d medical image compression

    Muharam, AzlanUniversiti Tun Hussein Onn Malaysia2019

    … comparative study of discrete wavelet transform (DWT) and without DWT for 3-D medical image compression systems. Implementation results on MRI and CT images, showing GPU significantly outperforming single-threaded CPU implementation. Overall, CT and MRI modalities with DWT outperform in term of …

    uthm Repository record

  13. Orthogonal vs. Biorthogonal Wavelets for Image Compression

    Rout, SatyabrataVirginia Tech2003

    … 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 …

    vt Repository record

  14. Optimal, Multiplierless Implementations of the Discrete Wavelet Transform for Image Compression Applications

    Kotteri, KishoreVirginia Tech2004

    The use of the discrete wavelet transform (DWT) for the JPEG2000 image compression standard has sparked interest in the design of fast, efficient hardware implementations of the perfect reconstruction filter bank used for computing the DWT. The accuracy and efficiency with which the filter …

    vt Repository record

  15. Structural Damage Assessment Using Artificial Neural Networks and Artificial Immune Systems

    Shi, Arthur Q.X.2018

    … with the use of discrete wavelet transforms (DWT)s first. The DWT coefficients are used to calculate energy ratios, which are then classified using a neural network and an AIS algorithm known as negative selection (NS). The effectiveness of both methods are validated using simulated …

    calpoly Repository record

  16. Combined robust and fragile watermarking algorithms for still images. Design and evaluation of combined blind discrete wavelet transform-based robust watermarking algorithms for copyright protection using mobile phone numbers and fragile watermarking algorithms for content authentication of digital still images using hash functions.

    Jassim, Taha D.University of Bradford2014

    … and two-level Discrete Wavelet Transform (DWT) were developed for copyright protection. The mobile number with international code is used as the watermarking data. The robust algorithms used the Low-Low frequency coefficients of the DWT to embed the watermarking information. The …

    bradford Repository record

  17. The effect of resistive exercise on resting metabolic rate, lean body weight, and percent fat during caloric restriction in obese females

    Robinson, Darren J.Virginia Tech1990

    … 6) and caloric restriction plus weight training (DWT group; n = 8} on total weight (TW), percent fat (% fat), lean body weight (LBW), and RMR during an 8 week study. Both groups met 3 days/week for 30-45 min/day to perform a specific exercise or flexibility routine. The DWT group performed three …

    vt Repository record

  18. Label-free proteomic analysis of Xerophyta schlechteri leaf tissue under dehydration stress

    Gabier, HawwaDepartment of Molecular and Cell Biology2021

    … which represents ~ 80 - 70% RWC (1.61 gH2O g ̄ˡ dwt -1.5 gH2O g ̄ˡ dwt), a mid-response to drying (MRD) represented by ~ 60 - 40% RWC (1.5 gH2O g ̄ˡ dwt -1.0 gH2O g ̄ˡ dwt) and a late response to drying (LRD), represented by ~ 40 - 10% RWC (1.0 gH2O g ̄ˡ dwt - 0.5 gH2O g ̄ˡ dwt). Morphological …

    cape-town Repository record

  19. PREDICTING METRICS FOR NAVAL SUPPLY SYSTEMS COMMAND WHOLESALE INVENTORY OPTIMIZATION MODEL

    Patterson, Thomas B.Monterey, CA; Naval Postgraduate School2026

    … documents required (DOCS), demand wait time (DWT), and demand wait time for backorder (DWTBO) can be accurately predicted using machine learning models instead of repeated simulation runs. We examine two machine learning approaches: k-nearest neighbors (KNN) and Extreme Gradient Boosting …

    nps Repository record

  20. Wavelets for approximate Fourier transform and data compression

    Guo, HaitaoRice University1997

    … that uses the discrete wavelet transform (DWT) as a tool to compute the discrete Fourier transform (DFT). The classical Cooley-Tukey FFT is shown to be a special case of the proposed algorithm when the wavelets in use are trivial. The main advantage of our algorithm is that the good time …

    rice Repository record

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