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   -> Volume 7, Issue 6


Preprints: Two Preprints on Wavelet-based Video Coding
 
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Detlev Marpe (marpe@charite.de)
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PostPosted: Tue Jun 16, 1998 1:53 pm    
Subject: Preprints: Two Preprints on Wavelet-based Video Coding
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#5 Preprints: Two Preprints on Wavelet-based Video Coding

I would like to announce the availability of two preprints on
wavelet-based video coding methods:

PAPER No.1: Very Low Bit Rate Video Coding Using Wavelet-Based Techniques

AUTHORS: Detlev Marpe and Hans L. Cycon

ABSTRACT: In this paper, we propose a very low bit rate video coding
scheme based on a discrete wavelet transform (DWT), block-matching
motion estimation (BME) and overlapped block motion compensation
(OBMC). Our approach reveals that the coding process works more
efficiently if the quantized wavelet coefficients will be
pre-processed by a mechanism exploiting the redundancies in the
wavelet subband structure. Thus, we introduce a new framework of
pre-coding techniques based on the concepts of partitioning,
aggregation and conditional coding (PACC). Our experimental results
show that our PACC coder outperforms the Video Verification Model (VM,
Version 5.1) of MPEG4 both for coding of intra-frames (1--2 dB PSNR)
and residual frames (up to 1.5 dB PSNR) of typical MPEG4 test
sequences. The subjective quality of reconstructed video is in general
superior to that obtained from the VM implementation. In addition,
when restricted to intra-frame mode, the proposed coding algorithm
produces results which are among the best reported for still image
compression.

STATUS:
to appear in IEEE Transactions on Circuits and Systems for Video
Technology, Special Issue on Image and Video Processing for Emerging
Interactive Multimedia Services, September 1998.

PAPER No.2: A Wavelet-Based Video Coding Scheme Using Image Warping
Prediction

AUTHORS: Guido Heising, Detlev Marpe, and Hans L. Cycon

ABSTRACT: This paper describes a video coding algorithm that combines
new ideas in motion estimation and wavelet-based coding techniques. A
motion estimation technique using an image warping model is employed
to reduce temporal redundancies in a given image sequence. The
underlying continuous motion model is based on a bilinear warp of a
grid of quadrangles. It has the advantage of dealing with more complex
motion than simple block matching schemes. In addition, a block
adaptive high-quality texture interpolation is used to further improve
the quality of the prediction. The prediction error image is
decorrelated using a wavelet transform coupled with a framework of
highly efficient pre-coding techniques utilizing the concepts of
partitioning, aggregation and conditional coding (PACC). This combined
coding strategy has proved to be very efficient both with respect to
subjective and objective measures. The improvements achieved with our
proposed coder compared to the H.263 coder (with all options applied)
range from 0.5 to 1.2 dB PSNR. Especially at very low bit-rates where
reconstructed videos of block-based coders suffer from visually
annoying blocking artifacts the proposed coding scheme produces a
superior subjective quality.

STATUS:
accepted for IEEE Int. Conference on Image Processing (ICIP) 1998,
Chicago, October 1998.

The papers are available (in Postscript-format) at the URL
http://www.fhtw-berlin.de/Projekte/Wavelet/papers.html

Detlev Marpe

Humboldt University Fachhochschule fuer
Charite Technik und Wirtschaft
Digital Radiology Fachbereich Nachrichtentechnik
Berlin Berlin
GERMANY GERMANY
marpe@charite.de dmarpe@fhtw-berlin.de
http://www.ukrv.de/rv/str/dr http://www.fhtw-berlin.de/Projekte/Wavelet
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