Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"inverse transform"”.
-
Modeling three-dimensional acoustic propagation in underwater waveguides using the longitudinally invariant finite element method
… occur in only one dimension. In this method, a transform is applied to the three-dimensional Helmholtz equation to remove the range-independent dimension. The finite element method is employed to solve the transformed Helmholtz equation for each out-of-plane wavenumber. Finally, the inverse …
-
Energy-efficient video decoding using data statistics
… variety of algorithmic techniques such as larger transform sizes and more accurate inter-frame prediction. However, these techniques increase the complexity of software and hardware-based video decoders. In this thesis, we design a hardware-based video decoder chip that exploits the statistics of …
-
Resolução de problemas viscoelásticos utilizando o método dos elementos de contorno
… problems through the application of the Laplace transform and the correspondence principle. The inverse transform is obtained by using Durbin's method coupled with a Fast Fourier Transform (F.F.T.) procedure. ln the first chapters a 2-D elastic computer program is described where different …
-
Circuit implementations for high-efficiency video coding tools
… this work, digital circuits for two HEVC tools - inverse transform and deblocking filter are implemented to support Quad-Full HD (4K x 2K) video decoding at 30fps. Techniques to reduce power and area cost are investigated and synthesis results in 40nm CMOS technology and Virtex-6 FPGA platform are …
-
Using the Hough transform for analysis of images containing straight lines
The Hough transform is a means for finding straight lines in an image. Since it is robust and efficient it is widely used in machine vision systems. The Hough transform has been shown to be a special case of the Radon transform. As a result, the Hough transform can be inverted using the inverse …
-
GPU accelerated risk quantification
… three methods of generating these samples via inverse transform sampling on the GPU are investigated. One method calculates the inverse incomplete beta function directly, and the other two methods approximate this function - trading accuracy for improved parallelism. This method is then …
-
A general linear systems theory on time scales : transforms, stability, and control.
… time scale setting by considering Laplace transforms, stability, controllability, and realizability. In particular, we revisit the definition of the Laplace transform by Bohner and Peterson in [10]. We provide sufficient conditions for a given function to be transformable, as well as an …
-
A near-optimal wavelet-based estimation technique for video sequences
… performing a one-dimensional discrete Fourier transform in order to decorrelate the video sequence between each two-dimensional frame or across each channel, and then performing a two-dimensional discrete wavelet transform on each of the resulting frames. Thresholding is then implemented, and …
-
Digital image processing of orbital synthetic aperture radar
… for the selected technique, namely the Radon transform. A transputer network is described in detail, together with OCCAM software to perform the Radon transform within a few seconds. The Radon transform, performed via the two-dimensional frequency domain, uses a technique based on the Fourier …
-
The use of stochastic collocation for sampling from expensive distributions with applications in finance
… distributions. These are distributions with inverse cumulative distribution functions that are difficult to evaluate, thus requiring significant computation time. To mitigate this, Grzelak et al. (2015) introduced the stochastic collocation Monte Carlo sampler. This sampling method is based …
-
Image analysis using visual saliency with applications in hazmat sign detection and recognition
… of saliency map candidates are then obtained by inverse transform. A final saliency map is selected among the candidates by minimizing the entropy of the saliency map candidates. The proposed models based on the separate and composite model families are also extended to various color spaces. We …
-
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 …
-
Topics on option valuation and model calibration
This dissertation is devoted to high performance numerical methods for option valuation and model calibration in L´evy process and stochastic volatility models. In the first part, a numerical scheme for simulating from an analytic characteristic function is developed. Theoretically, error bounds …
-
Transform Based And Search Aware Text Compression Schemes And Compressed Domain Text Retrieval
… proposed an approach to develop a reversible transformation that can be applied to a source text that improves existing algorithm's ability to compress. We use a static dictionary to convert the English words into predefined symbol sequences. These transformed sequences create additional …