Title :
Improving decoding speed for parallel Distributed Video Coding architectures
Author :
Micallef, Jeffrey J. ; Farrugia, Reuben A. ; Debono, Carl J.
Author_Institution :
Dept. of Commun. & Comput. Eng., Univ. of Malta, Msida, Malta
Abstract :
The Distributed Video Coding (DVC) paradigm is suitable for devices which have limited encoding capabilities. However, it is characterized by excessive decoding delays which compromise their application for time constrained services. This limitation can be mitigated by adopting parallel DVC architectures. Yet, the traditional Gray-code or binary-code representations have a non-uniform distribution of mismatch across bit-planes, resulting in uneven decoding times which hinder parallel decoding. This work proposes an alternative indexing scheme, where mismatch is distributed more uniformly amongst bit-planes and thus comparable decoding delays are expected, facilitating parallel implementations. This method reduces decoding time by up to 32% compared to architectures using simple parallel techniques, with a slight loss of 0.06dB in RD performance.
Keywords :
Gray codes; binary codes; decoding; parallel architectures; rate distortion theory; video coding; DVC paradigm; Gray-code; RD performance; alternative indexing scheme; binary-code representations; bit-planes; decoding delays; decoding speed; encoding capabilities; mismatch nonuniform distribution; parallel DVC architectures; parallel distributed video coding architectures; rate-distortion; time constrained services; Computer architecture; Decoding; Encoding; Histograms; Indexes; Silicon; Video coding; Distributed video coding; Wyner-Ziv coding; index assignment; parallel architecture; source representation;
Conference_Titel :
Signal Processing Conference (EUSIPCO), 2013 Proceedings of the 21st European
Conference_Location :
Marrakech