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.
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Showing 1 to 8 of 8 for “"Discrete wavelet transforms"”.
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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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Wavelet transform methods for identifying onset of SEMG activity
… (sEMG) activity. Applying methods from wavelet theory developed in the past decade to digitized signals, a robust algorithm has been designed for use with sEMG collected during reaching tasks executed with the less-affected arm of stroke patients. The method applied both Discretized …
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Structural Damage Assessment Using Artificial Neural Networks and Artificial Immune Systems
… out of the acceleration data 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 …
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A robust region-adaptive digital image watermarking system
… of the host image. The embedding algorithms use discrete wavelet transforms and a combination of discrete wavelet transforms and singular value decomposition, respectively. This technique is derived from the earlier hypothesis that the robustness of a watermarking process can be improved by using …
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Field Evaluation of Doppler LIDAR Sensors for Early Assessment of Track Instability
… algorithms, inspection via Short Time Fourier Transforms, Discrete Wavelet Transforms, and manual inspection. None of the methods can be done automatically; they each require a different amount of setup and pre-processing before the raw data can be made suitable for the analysis offered by …
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Predicting the level of cognitive function from standing balance and salivary biomarkers
… and ML COP movements were further analysed with discrete wavelet transforms (DWT) to determine if they could statistically predict MoCA scores and differentiate between MoCA categories with an acceptable accuracy using age and timed-up-and-go (TUG) as covariates in a binary logistic regression. …
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Development of digital imaging technologies for the segmentation of solar features and the extraction of filling factors from SODISM images
Solar images are one of the most important sources of available information on the current state and behaviour of the sun, and the PICARD satellite is one of several ground and space-based observatories dedicated to the collection of that data. The PICARD satellite hosts the Solar Diameter Imager …
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Robust Noise Filtering techniques for improving the Quality of SODISM images using Imaging and Machine Learning
… images. In this thesis, the Modified Undecimated Discrete Wavelet Transform (M-UDWT) technique is used to de-noise and enhance the quality of SODISM images. The proposed method is robust and effectively improves the quality of SODISM images, and produces more precise information and clear feature …