Smooth signal extension for M-channel paraunitary filterbanks and its application to image coding

Tomohiro Oka, Toshiyuki Uto, Masaaki Ikehara

    Research output: Contribution to conferencePaper

    3 Citations (Scopus)

    Abstract

    In the transform-based image coding, the symmetric extension is important to obtain subband signals effectively without increasing the total number of signal. However in the case of the symmetric extension, subband filters have to be (anti-)symmetric. This means that the linear phase property is strict constraint on filters' impulse response for the symmetric extension. For the other method of the signal extension, the periodic extension is implemented. While it can be applied to any filters, it introduces artificial discontinuities at the signal boundaries. In this paper, we present a smooth extension for M-channel filterbanks to implement nonexpansive decomposition. First, we derive a condition for solving the coefficient expansion problem. Second, we calculate a smooth extended signal under the condition by singular value decomposition. Finally, we design 8 channel 16 tap paraunitary filterbank using lattice structure, and several image coding and extended signal examples are shown to confirm the validity of the proposed approach.

    Original languageEnglish
    Pages229-232
    Number of pages4
    Publication statusPublished - 2003 Dec 17
    EventProceedings: 2003 International Conference on Image Processing, ICIP-2003 - Barcelona, Spain
    Duration: 2003 Sep 142003 Sep 17

    Other

    OtherProceedings: 2003 International Conference on Image Processing, ICIP-2003
    CountrySpain
    CityBarcelona
    Period03/9/1403/9/17

    ASJC Scopus subject areas

    • Hardware and Architecture
    • Computer Vision and Pattern Recognition
    • Electrical and Electronic Engineering

    Fingerprint Dive into the research topics of 'Smooth signal extension for M-channel paraunitary filterbanks and its application to image coding'. Together they form a unique fingerprint.

  • Cite this

    Oka, T., Uto, T., & Ikehara, M. (2003). Smooth signal extension for M-channel paraunitary filterbanks and its application to image coding. 229-232. Paper presented at Proceedings: 2003 International Conference on Image Processing, ICIP-2003, Barcelona, Spain.