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Showing 1 to 20 of 67 for “"discrete wavelet transform"”.
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Image interpolation and denoising in discrete wavelet transform domain
… and processing time, manipulating images in the transform domain, which is possible, is an efficient solution; The uniform wavelet thresholding is one of the most widely used methods for image denoising in the Discrete Wavelet Transform (DWT) domain. This method, however, has the drawback of …
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Analysis of protein secondary structure via the discrete wavelet transform
… structure prediction approach that uses the discrete wavelet transform. In order to use the wavelet technique, we convert the primary amino acid sequence of the protein to a numerical signal using the hydrophobic tendencies associated with the amino acids. The data used in this project …
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An FPGA-based Run-time Reconfigurable 2-D Discrete Wavelet Transform Core
… design process description 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 …
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Optimal, Multiplierless Implementations of the Discrete Wavelet Transform for Image Compression Applications
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 …
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Trend Analysis of Belief-State History with Discrete Wavelet Transform for Improved Intention Discovery
… the POMDP model and to analyze its trend with discrete wavelet transformation (DWT). Accordingly, a new algorithm is developed to improve the accuracy of intention discovery with trend analysis, and to reduce the dialog length by switching POMDP policies between contextual control modes …
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A comparison of discrete cosine transform and discrete wavelet transform algorithm in watermarking against common attacks
… there is no comparison documented done between Discrete Cosine 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 …
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The discrete wavelet transform as a precursor to leaf area index estimation and species classification using airborne hyperspectral data
… hyperspectral data for vegetation applications. Discrete wavelet transform (DWT), through multiresolution analysis, offers oppurtunities both to reduce dimension and convey information at multiple spectral scales. In this study, we investigated the utility of the Haar DWT for AVIRIS hyperspectral …
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Fault Identification of UPFC-Compensated Transmission Lines in Complex Microgrids Using an Intelligent Relaying Scheme Based on Discrete Wavelet Transform and ANN Classifier
Transformation of traditional power infrastructures to modern inter-connected electrical grids has resulted in the emergence of microgrids as modernization of the existing aging transmission and distribution systems. Microgrids allow integration of distributed energy resources (DER) such as wind …
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Application of Wavelets to Filtering and Analysis of Self-Similar Signals
… Processing has been dominated by the Fourier transform since the Fast Fourier Transform (FFT) was developed in 1965 by Cooley and Tukey. In the 1980's a new transform was developed called the wavelet transform, even though the first wavelet goes back to 1910. With the Fourier transform, all …
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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.
… authentication for still images. New blind transform domain block based algorithms using one-level 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 …
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Damage Detection and System Identification using a Wavelet Energy Based Approach
… sets based on the relative energies of the Wavelet Components of the acceleration responses, the equations of motion of the system in the time domain were converted to a reduced representation of the equations of motion in terms of the DWT and of the DWPT. Finally, the least square error …
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Power Transformer Partial Discharge (PD) Acoustic Signal Detection using Fiber Sensors and Wavelet Analysis, Modeling, and Simulation
… The signal analysis employs the application of wavelet-based denoising technique to remove the noises, which mainly came from vibration, EMI, and light sources, embedded in the PD signal. The denoising technique includes the discrete wavelet transform (DWT) decomposition, thresh-holding of …
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Hybrid DWT-DCT algorithm for image and video compression applications
… image/video information. There are various transformation techniques used for data compression. Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) are the most commonly used transformation. DCT has high energy compaction property and requires less computational resources. …
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Wavelets for approximate Fourier transform and data compression
… has two parts. In the first part, we develop a wavelet-based fast approximate Fourier transform algorithm. The second part is devoted to the developments of several wavelet-based data compression techniques for image and seismic data. We propose an algorithm that uses the discrete wavelet …
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Wavelet Factorization and Related Polynomials
… that allow for efficient implementation of the discrete wavelet transform (DWT) for the algorithms of Daubechies and Sweldens and Mallat. Nearest neighbor lifting is a specific form of the general lifting scheme that improves the lifting algorithm by optimizing the number of efficient memory …
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Analysis of time-varying harmonics in electrical distribution systems
… voltages is presented. In the second method, wavelet transforms is applied to harmonic signal variations. The Discrete Wavelet Transform is used to quantify harmonic changes with time. Experimental data of fundamental and harmonic currents are analyzed both methods and the results presented. …
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Loop Transformations for the Optimized Generation of Reconfigurable Hardware
… the memory hierarchy problem to high-level transformations of loop structures. The composition of long transformation sequences by combining shorter subsequences is studied together with the influence of the order of applying transformation steps. Several methods are presented to estimate …
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Orthogonal Filters and the Implications of Wrapping on Discrete Wavelet Transforms
Discrete wavelet transforms have many applications, including those in image compression and edge detection. Transforms constructed using orthogonal filters are extremely useful in that they can easily be inverted as well as coded. We review the major properties of three well-known orthogonal …
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Detecting anomalies in remotely sensed hyperspectral signatures via wavelet transforms
… from -95dB to -50dB. The system utilizes a wavelet-based method (discrete wavelet transform) to extract an energy feature vector from each input pixel signature. The dimensionality of the feature vector is reduced to a one-dimensional feature scalar through the process of linear discriminant …
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