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Subject: search.filters.subject.Wavelet decomposition

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    Detection of power system oscillations using synchronized phasor measurement units through home power outlets
    (2006-12-01)
    Ngamroo, I.
    ;
    Mitani, Y.
    ;
    Dechanupaprittha, S.
    ;
    Hongesombut, K.
    ;
    Jintakosonwit, P.
    This paper deals with a detection system of the inter-area oscillation between central and southern areas of Thailand power system using GPS-based synchronized phasor measurement units (PMUs). The PMUs are installed at two universities representing both areas. The phasor data of a single phase voltage 220 V are measured by PMU via power outlet. The proposed system not only requires low capital cost but uses internet for data transmission. The wavelet decomposition and least-squares error are applied to identify the eigenvalue corresponding to inter-area mode.
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    A robust image watermarking using multiresolution analysis of wavelet
    (2005-12-01)
    Temi, Chirawat
    ;
    Choomchuay, Somsak
    ;
    Lasakul, Attasit
    Embedding watermark in the wavelet becomes more attractive to most researchers as it could provide better performance. In this paper present a method of embedding binary visualized image into the host image by modifying coefficients of wavelet domain in LL bands with appropriate strength factor in order to compromise between acceptable imperceptibility level and attacks' resistance. Qualified Significant Wavelet Tree (QSWT) is used in both to select locations where watermark data are to be embedded, and to find locations of watermark in the extraction process. Results show that the proposed method successfully achieves robustness level of various attacks such as image processing, rotation attack etc. © 2005 IEEE.