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   -> Volume 5, Issue 10


Preprint: Scalable Wavelet Video Codec for Low Bit rate
 
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Tham Jo Yew (thamjy@haar.math.nus.sg)
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PostPosted: Tue Dec 03, 1996 8:42 am    
Subject: Preprint: Scalable Wavelet Video Codec for Low Bit rate
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#7 Preprint: Scalable Wavelet Video Codec for Low Bit rate

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

Authors: Jo Yew Tham, Surendra Ranganath, Ashraf A. Kassim
Department of Electrical Engineering,
National University of Singapore
10 Kent Ridge Crescent,
Singapore 119260

Status: Submitted to IEEE Transactions on Circuits And Systems for Video
Technology, August 1996

ABSTRACT: In this paper, we describe a complete scalable video
compression system for very low bit rate applications. First, a
three-parameter motion model is used to compensate for interframe
motion within a chosen group of frames (GOF) with respect to a
reference frame. This motion-compensated GOF is then transformed via
a three-dimensional separable wavelet (packet) decomposition
framework. By employing a new data structure called {tri-zerotrees},
and applying the method of layered/progressive coding, very high
compression ratios can be achieved in a fully embedded and scalable
fashion. With this class of scalable algorithms, we need to generate
only one original version of the compressed video without any prior
information of the potentially different decoders' requirements. This
is possible because different subsets of the same compressed bit
stream can then be selectively extracted, transmitted, decoded, and
displayed to meet a multitude of combinations of display spatial
resolutions, frame rates, bit rates, and decoders' hardware
complexities. The newly-extracted bit stream can also subsequently be
rescaled further to fulfil other displayp specifications. By
generating a fully embedded bit stream, precise bit rate control can
be achieved in both the encoding and decoding processes, regardless of
the chosen frame rates and spatial resolutions. Our simulations also
showed that compressed videos with high subjective quality and PSNR
values can be obtained at bit rates of less than 15 kbps.

Keywords: video compression, wavelets, motion compensation,
tri-zerotrees, very low bit rates, multiresolution and multirate
scalability

Please visit http://www.cadcam.nus.sg/~ele22091 or e-mail
thamjy@wavelets.math.nus.sg for more information.

Thank you for your attention.

Tham Jo Yew | i) thamjy@wavelets.math.nus.sg
Research Assistant, and | ii) mattjy@nus.sg
Postgraduate Research Student | iii)
ele22091@hpdc1.cadcam.nus.sg
The National University of Singapore |
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