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   -> Volume 6, Issue 7


Preprint: Highly Scalable Wavelet Video Codec
 
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Tham Jo Yew (thamjy@haar.math.nus.sg)
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PostPosted: Mon Jun 23, 1997 4:56 am    
Subject: Preprint: Highly Scalable Wavelet Video Codec
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#2 Preprint: Highly Scalable Wavelet Video Codec

Dear Wavelet Digest Readers,

We are pleased to make available a final revised version preprint of a
paper. It will be published in IEEE Journal on Selected Areas in
Communications - Special Issue of Very Low Bit-rate Coding.

TITLE: Highly Scalable Wavelet-Based Video Codec for Very Low
Bit-rate Environment

AUTHORS: Jo-Yew Tham, Surendra Ranganath, and Ashraf A. Kassim

URL: http://wavelets.math.nus.sg/members/thamjy.html

ABSTRACT: In this paper, we introduce a highly scalable video
compression system for very low bit rate videoconferencing and
telephony applications around 10-30 Kbps. The video codec first
performs a motion compensated three-dimensional wavelet (packet)
decomposition of a group of video frames, and then encodes the
important wavelet coefficients using a new data structure called
tri-zerotrees. Together, the proposed video coding framework forms an
extension of the original zerotree idea of Shapiro for still image
compression. In addition, we also incorporate a high degree of video
scalability into the codec by combining the layered/progressive coding
strategy with the concept of embedded resolution block coding. With
scalable algorithms, only one original compressed video bit stream is
generated. Different subsets of the bit stream can then be selected
at the decoder to support a multitude of display specifications such
as bit rate, quality level, spatial resolution, frame rate, decoding
hardware complexity, and end-to-end coding delay. The proposed video
codec also allows precise bit rate control at both the encoder and
decoder, and this can be achieved independently of the other video
scaling parameters. Such a scheme is very useful for both constant
and variable bit rate transmission over mobile communication channels,
as well as video distribution over heterogeneous multicast networks.
Finally, our simulations demonstrated comparable objective and
subjective performance when compared to the ITU-T H.263 video coding
standard, while providing both multirate and multiresolution video
scalability.

Keywords: video coding, wavelet transform, motion compensation,
tri-zerotrees, multiresolution, multirate video scalability.

Cheers,

Do visit my PARADISE at "http://www.cadcam.nus.sg/~ele22091/"

Jo-Yew Tham | E-mails: mattjy@nus.sg OR
Research Associate | thamjy@wavelets.math.nus.sg
Wavelets Strategic Research Programme |
Department of Mathematics | Ph.D. Postgraduate Research
National University of Singapore | Department of Electrical
Engineering
Tel: +65 772-2773 Fax: +65 779-5452 | National University of Singapore
All times are GMT + 1 Hour
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