Sökning: "Wavelets"

Visar resultat 21 - 25 av 33 uppsatser innehållade ordet Wavelets.

  1. 21. Microcalcification Detection in Mammography using Wavelet Transform and Statistical Parameters

    Master-uppsats, Göteborgs universitet/Institutionen för matematiska vetenskaper

    Författare :Eliza Hashemi Aghjekandi; [2012-03-15]
    Nyckelord :Microcalcifications in Mammography; Wavelets Transforms; Skewness; Kurtosis Parameter;

    Sammanfattning : The earliest sign of breast cancer is the existence of microcalcifications which are tiny calcium clusters in breast tissues detected in mammographies. Early detection and diagnosis of microcalcifications is the main step to improve prognosis of breast cancer, which is one of the most frequently serious disease among women. LÄS MER

  3. 22. Does PPP hold in the long run? An empirical approach using wavelets.

    Magister-uppsats, Lunds universitet/Nationalekonomiska institutionen

    Författare :David Berger; [2012]
    Nyckelord :Fractionally Integrated Processes; Wavelets; Time Series Analysis; Purchasing Power Parity; Long Run Memory; Business and Economics;

    Sammanfattning : This paper contributes to the debate as to whether or not Purchasing Power Parity (PPP) holds in the long run. This is done by looking at fractionally integrated processes (FIP) and using wavelets in order to obtain an Ordinary Least Squares (OLS) estimate of the long run memory parameter. LÄS MER

  4. 23. Evaluation of Long-term Discharge in Swedish Rivers

    Master-uppsats, Lunds universitet/Avdelningen för Teknisk vattenresurslära

    Författare :Angelica Lidén; Karin Persson; [2012]
    Nyckelord :River Discharge Time Series; Sweden; Wavelet analysis; Northern Hemisphere Teleconnection Patterns and Decadal Oscillation.; Technology and Engineering;

    Sammanfattning : Seasonal forecasting is not an easy task to deal with. A number of large scale atmospheric phenomena, e.g. Northern Atlantic Oscillation (NAO), Scandinavia (SCA) and Pacific Decadal Oscillation (PDO) affect the climate in Sweden and the effect on rivers is an integration of all the complex inter-relation among all these atmospheric phenomena. LÄS MER

  5. 24. 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

  7. 25. Image Compression by Using Haar Wavelet Transform and Singualr Value Decomposition

    Master-uppsats, Institutionen för datavetenskap, fysik och matematik, DFM

    Författare :Zunera Idrees; Eliza Hashemiaghjekandi; [2011]
    Nyckelord :Multi resolution analysis; Haar wavelet transformation MRA ; Average and difference method; Singular value decomposition SVD .;

    Sammanfattning : The rise in digital technology has also rose the use of digital images. The digital imagesrequire much storage space. The compression techniques are used to compress the dataso that it takes up less storage space. In this regard wavelets play important role. LÄS MER