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Improved side information generation using adaptive overlapped block motion compensation and higher-order interpolation

Akinola, Mobolaji; Dooley, Laurence and Wong, Patrick (2011). Improved side information generation using adaptive overlapped block motion compensation and higher-order interpolation. In: 18th International Conference on Systems, Signals and Image Processing (IWSSIP 2011), 16-18 June 2011, Sarajevo, Bosnia and Herzegovina .

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Abstract

This work addresses the twin issues of overlapping and blocking artifacts in Distributed Video Coding side information (SI). These both emanate from the block matching algorithm (BMA) used for motion vector (MV) generation rather than pixel-wise processing. In temporal correlation exploitation and particularly in the formulation of higher-order piecewise temporal trajectory interpolation (HOPTTI), BMA has been applied due to its speed and simplicity. While HOPTTI has exhibited superior SI quality to other BMA-based algorithms, the adaptive overlapped block motion compensation (AOBMC) algorithm reduces the overlapping and blocky artifacts by adjusting the coefficients of a raised cosine overlapped window based on neighboring MV reliability. The aim of this paper is to investigate the benefits of combining HOPTTI with AOBMC. A mode switching (MS) mechanism is introduced to exploit the spatial-temporal correlation in a sequence to select between frames which will benefit from combining HOPTTI with AOBMC via a matching criterion. Experimental results confirm that selectively combining HOPTTI with AOBMC gives better SI quality, with on average up to 1.8dB improvement compared to using only HOPTII, and up to 3.6dB improvement over existing AOBMC based algorithms.

Item Type: Conference Item
Copyright Holders: 2011 The Authors
Keywords: wyner-ziv; side information; higher order interpolation; distributed video coding; mode switching; adaptive overlapped block mation compensation
Academic Unit/Department: Mathematics, Computing and Technology > Computing & Communications
Mathematics, Computing and Technology > Computing & Communications
Interdisciplinary Research Centre: Centre for Research in Computing (CRC)
Item ID: 28584
Depositing User: Mobolaji Akinola
Date Deposited: 06 Jun 2011 08:05
Last Modified: 27 Oct 2012 04:04
URI: http://oro.open.ac.uk/id/eprint/28584
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