The paper argues that the JPEG coder is based on a non-optimal entropy coding method. It is shown that for frequency domain coders using uniform quantization it is optimal to use entropy coders optimized for the entropy in each frequency component. A subband coder model with uniform quantization followed by optimal entropy coding is presented, where each subband is allocated an entropy coder based on its entropy. The theoretical coding gain limit for this model is shown to be the same as for frequency domain coders employing explicit bit allocation. However, the new model exploits the advantage associated with variable length coding. In addition, it is possible to efficiently use midtread quantizers, which have higher mean square error performance and, more important, better visual performance than midrise quantizers. Advantages for practical subband image coders are discussed in the paper.<>


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Optimal entropy coding in image subband coders


    Beteiligte:
    Lervik, J.M. (Autor:in) / Ramstad, T.A. (Autor:in)


    Erscheinungsdatum :

    01.01.1994


    Format / Umfang :

    519842 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Optimal Entropy Coding in Image Subband Coders

    Lervik, J. M. / Ramstad, T. A. / IEEE; Signal Processing Society | British Library Conference Proceedings | 1994


    Simplified Digital Subband Coders And Decoders

    Glover, Daniel R. | NTRS | 1994



    Color image coding using wavelet pyramid coders

    Mitra, S. / Long, R. / Pemmaraju, S. et al. | IEEE | 1996


    Color Image Coding Using Wavelet Pyramid Coders

    Mitra, S. / Long, R. / Muyshondt, R. et al. | British Library Conference Proceedings | 1996