Sökning: "Wavelet thresholding"

Hittade 3 uppsatser innehållade orden Wavelet thresholding.

1. 1. Application of Noise Invalidation Denoising in MRI

   Master-uppsats, Medicinsk informatik; Tekniska högskolan

   Författare :Pegah Elahi; [2012]
   Nyckelord :Magnetic Resonance Imaging; Noise Invalidation Denoising; Wavelet Transform Function;

   Sammanfattning : Magnetic Resonance Imaging (MRI) is a common medical imaging tool that have beenused in clinical industry for diagnostic and research purposes. These images are subjectto noises while capturing the data that can eect the image quality and diagnostics. LÄS MER

3. 2. Statistical Parametric Mapping of fMRI data using Spectral Graph Wavelets

   Master-uppsats, Medicinsk informatik; Tekniska högskolan

   Författare :Hamid Behjat; [2012]
   Nyckelord :Statistical parametric mapping; fMRI; Spectral graph theory; Graph wavelet transform; Wavelet thresholding;

   Sammanfattning : In typical statistical parametric mapping (SPM) of fMRI data, the functional data are pre-smoothed using a Gaussian kernel to reduce noise at the cost of losing spatial specificity. Wavelet approaches have been incorporated in such analysis by enabling an efficient representation of the underlying brain activity through spatial transformation of the original, un-smoothed data; a successful framework is the wavelet-based statistical parametric mapping (WSPM) which enables integrated wavelet processing and spatial statistical testing. LÄS MER

4. 3. Grain Reduction in Scanned Image Sequences under Time Constraints

   Uppsats för yrkesexamina på avancerad nivå, Bildbehandling; Tekniska högskolan

   Författare :Lina Stuhr; [2009]
   Nyckelord :image enhancement; digitalization; film grain; scanner;

   Sammanfattning : This thesis is about improving the image quality of image sequences scanned by the film scanner GoldenEye. Film grain is often seen as an artistic effect in film sequences but scanned images can be more grainy or noisy than the intention. LÄS MER